deleted file mode 100644
--- a/src/ai/ai.c
+++ /dev/null
@@ -1,247 +0,0 @@
-/* $Id$ */
-
-#include "../stdafx.h"
-#include "../openttd.h"
-#include "../variables.h"
-#include "../command.h"
-#include "../network/network.h"
-#include "ai.h"
-#include "default/default.h"
-
-/**
- * Dequeues commands put in the queue via AI_PutCommandInQueue.
- */
-static void AI_DequeueCommands(PlayerID player)
-{
-	AICommand *com, *entry_com;
-
-	entry_com = _ai_player[player].queue;
-
-	/* It happens that DoCommandP issues a new DoCommandAI which adds a new command
-	 *  to this very same queue (don't argue about this, if it currently doesn't
-	 *  happen I can tell you it will happen with AIScript -- TrueLight). If we
-	 *  do not make the queue NULL, that commands will be dequeued immediatly.
-	 *  Therefor we safe the entry-point to entry_com, and make the queue NULL, so
-	 *  the new queue can be safely built up. */
-	_ai_player[player].queue = NULL;
-	_ai_player[player].queue_tail = NULL;
-
-	/* Dequeue all commands */
-	while ((com = entry_com) != NULL) {
-		_current_player = player;
-
-		_cmd_text = com->text;
-		DoCommandP(com->tile, com->p1, com->p2, com->callback, com->procc);
-
-		/* Free item */
-		entry_com = com->next;
-		free(com->text);
-		free(com);
-	}
-}
-
-/**
- * Needed for SP; we need to delay DoCommand with 1 tick, because else events
- *  will make infinite loops (AIScript).
- */
-static void AI_PutCommandInQueue(PlayerID player, TileIndex tile, uint32 p1, uint32 p2, uint procc, CommandCallback* callback)
-{
-	AICommand *com;
-
-	if (_ai_player[player].queue_tail == NULL) {
-		/* There is no item in the queue yet, create the queue */
-		_ai_player[player].queue = malloc(sizeof(AICommand));
-		_ai_player[player].queue_tail = _ai_player[player].queue;
-	} else {
-		/* Add an item at the end */
-		_ai_player[player].queue_tail->next = malloc(sizeof(AICommand));
-		_ai_player[player].queue_tail = _ai_player[player].queue_tail->next;
-	}
-
-	/* This is our new item */
-	com = _ai_player[player].queue_tail;
-
-	/* Assign the info */
-	com->tile  = tile;
-	com->p1    = p1;
-	com->p2    = p2;
-	com->procc = procc;
-	com->callback = callback;
-	com->next  = NULL;
-	com->text  = NULL;
-
-	/* Copy the cmd_text, if needed */
-	if (_cmd_text != NULL) {
-		com->text = strdup(_cmd_text);
-		_cmd_text = NULL;
-	}
-}
-
-/**
- * Executes a raw DoCommand for the AI.
- */
-int32 AI_DoCommandCc(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc, CommandCallback* callback)
-{
-	PlayerID old_lp;
-	int32 res = 0;
-	const char* tmp_cmdtext;
-
-	/* If you enable DC_EXEC with DC_QUERY_COST you are a really strange
-	 *   person.. should we check for those funny jokes?
-	 */
-
-	/* The test already resets _cmd_text, so backup the pointer */
-	tmp_cmdtext = _cmd_text;
-
-	/* First, do a test-run to see if we can do this */
-	res = DoCommand(tile, p1, p2, flags & ~DC_EXEC, procc);
-	/* The command failed, or you didn't want to execute, or you are quering, return */
-	if (CmdFailed(res) || !(flags & DC_EXEC) || (flags & DC_QUERY_COST)) {
-		return res;
-	}
-
-	/* Restore _cmd_text */
-	_cmd_text = tmp_cmdtext;
-
-	/* If we did a DC_EXEC, and the command did not return an error, execute it
-	 * over the network */
-	if (flags & DC_AUTO)     procc |= CMD_AUTO;
-	if (flags & DC_NO_WATER) procc |= CMD_NO_WATER;
-
-	/* NetworkSend_Command needs _local_player to be set correctly, so
-	 * adjust it, and put it back right after the function */
-	old_lp = _local_player;
-	_local_player = _current_player;
-
-#ifdef ENABLE_NETWORK
-	/* Send the command */
-	if (_networking) {
-		/* Network is easy, send it to his handler */
-		NetworkSend_Command(tile, p1, p2, procc, callback);
-	} else {
-#else
-	{
-#endif
-		/* If we execute BuildCommands directly in SP, we have a big problem with events
-		 *  so we need to delay is for 1 tick */
-		AI_PutCommandInQueue(_current_player, tile, p1, p2, procc, callback);
-	}
-
-	/* Set _local_player back */
-	_local_player = old_lp;
-
-	return res;
-}
-
-
-int32 AI_DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc)
-{
-	return AI_DoCommandCc(tile, p1, p2, flags, procc, NULL);
-}
-
-
-/**
- * Run 1 tick of the AI. Don't overdo it, keep it realistic.
- */
-static void AI_RunTick(PlayerID player)
-{
-	extern void AiNewDoGameLoop(Player *p);
-
-	Player *p = GetPlayer(player);
-	_current_player = player;
-
-	if (_patches.ainew_active) {
-		AiNewDoGameLoop(p);
-	} else {
-		/* Enable all kind of cheats the old AI needs in order to operate correctly... */
-		_is_old_ai_player = true;
-		AiDoGameLoop(p);
-		_is_old_ai_player = false;
-	}
-}
-
-
-/**
- * The gameloop for AIs.
- *  Handles one tick for all the AIs.
- */
-void AI_RunGameLoop(void)
-{
-	/* Don't do anything if ai is disabled */
-	if (!_ai.enabled) return;
-
-	/* Don't do anything if we are a network-client, or the AI has been disabled */
-	if (_networking && (!_network_server || !_patches.ai_in_multiplayer)) return;
-
-	/* New tick */
-	_ai.tick++;
-
-	/* Make sure the AI follows the difficulty rule.. */
-	assert(_opt.diff.competitor_speed <= 4);
-	if ((_ai.tick & ((1 << (4 - _opt.diff.competitor_speed)) - 1)) != 0) return;
-
-	/* Check for AI-client (so joining a network with an AI) */
-	if (!_networking || _network_server) {
-		/* Check if we want to run AIs (server or SP only) */
-		const Player* p;
-
-		FOR_ALL_PLAYERS(p) {
-			if (p->is_active && p->is_ai) {
-				/* This should always be true, else something went wrong... */
-				assert(_ai_player[p->index].active);
-
-				/* Run the script */
-				AI_DequeueCommands(p->index);
-				AI_RunTick(p->index);
-			}
-		}
-	}
-
-	_current_player = OWNER_NONE;
-}
-
-/**
- * A new AI sees the day of light. You can do here what ever you think is needed.
- */
-void AI_StartNewAI(PlayerID player)
-{
-	assert(IsValidPlayer(player));
-
-	/* Called if a new AI is booted */
-	_ai_player[player].active = true;
-}
-
-/**
- * This AI player died. Give it some chance to make a final puf.
- */
-void AI_PlayerDied(PlayerID player)
-{
-	/* Called if this AI died */
-	_ai_player[player].active = false;
-}
-
-/**
- * Initialize some AI-related stuff.
- */
-void AI_Initialize(void)
-{
-	/* First, make sure all AIs are DEAD! */
-	AI_Uninitialize();
-
-	memset(&_ai, 0, sizeof(_ai));
-	memset(&_ai_player, 0, sizeof(_ai_player));
-
-	_ai.enabled = true;
-}
-
-/**
- * Deinitializer for AI-related stuff.
- */
-void AI_Uninitialize(void)
-{
-	const Player* p;
-
-	FOR_ALL_PLAYERS(p) {
-		if (p->is_active && p->is_ai) AI_PlayerDied(p->index);
-	}
-}

new file mode 100644
--- /dev/null
+++ b/src/ai/ai.cpp
@@ -0,0 +1,247 @@
+/* $Id$ */
+
+#include "../stdafx.h"
+#include "../openttd.h"
+#include "../variables.h"
+#include "../command.h"
+#include "../network/network.h"
+#include "ai.h"
+#include "default/default.h"
+
+/**
+ * Dequeues commands put in the queue via AI_PutCommandInQueue.
+ */
+static void AI_DequeueCommands(PlayerID player)
+{
+	AICommand *com, *entry_com;
+
+	entry_com = _ai_player[player].queue;
+
+	/* It happens that DoCommandP issues a new DoCommandAI which adds a new command
+	 *  to this very same queue (don't argue about this, if it currently doesn't
+	 *  happen I can tell you it will happen with AIScript -- TrueLight). If we
+	 *  do not make the queue NULL, that commands will be dequeued immediatly.
+	 *  Therefor we safe the entry-point to entry_com, and make the queue NULL, so
+	 *  the new queue can be safely built up. */
+	_ai_player[player].queue = NULL;
+	_ai_player[player].queue_tail = NULL;
+
+	/* Dequeue all commands */
+	while ((com = entry_com) != NULL) {
+		_current_player = player;
+
+		_cmd_text = com->text;
+		DoCommandP(com->tile, com->p1, com->p2, com->callback, com->procc);
+
+		/* Free item */
+		entry_com = com->next;
+		free(com->text);
+		free(com);
+	}
+}
+
+/**
+ * Needed for SP; we need to delay DoCommand with 1 tick, because else events
+ *  will make infinite loops (AIScript).
+ */
+static void AI_PutCommandInQueue(PlayerID player, TileIndex tile, uint32 p1, uint32 p2, uint procc, CommandCallback* callback)
+{
+	AICommand *com;
+
+	if (_ai_player[player].queue_tail == NULL) {
+		/* There is no item in the queue yet, create the queue */
+		_ai_player[player].queue = malloc(sizeof(AICommand));
+		_ai_player[player].queue_tail = _ai_player[player].queue;
+	} else {
+		/* Add an item at the end */
+		_ai_player[player].queue_tail->next = malloc(sizeof(AICommand));
+		_ai_player[player].queue_tail = _ai_player[player].queue_tail->next;
+	}
+
+	/* This is our new item */
+	com = _ai_player[player].queue_tail;
+
+	/* Assign the info */
+	com->tile  = tile;
+	com->p1    = p1;
+	com->p2    = p2;
+	com->procc = procc;
+	com->callback = callback;
+	com->next  = NULL;
+	com->text  = NULL;
+
+	/* Copy the cmd_text, if needed */
+	if (_cmd_text != NULL) {
+		com->text = strdup(_cmd_text);
+		_cmd_text = NULL;
+	}
+}
+
+/**
+ * Executes a raw DoCommand for the AI.
+ */
+int32 AI_DoCommandCc(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc, CommandCallback* callback)
+{
+	PlayerID old_lp;
+	int32 res = 0;
+	const char* tmp_cmdtext;
+
+	/* If you enable DC_EXEC with DC_QUERY_COST you are a really strange
+	 *   person.. should we check for those funny jokes?
+	 */
+
+	/* The test already resets _cmd_text, so backup the pointer */
+	tmp_cmdtext = _cmd_text;
+
+	/* First, do a test-run to see if we can do this */
+	res = DoCommand(tile, p1, p2, flags & ~DC_EXEC, procc);
+	/* The command failed, or you didn't want to execute, or you are quering, return */
+	if (CmdFailed(res) || !(flags & DC_EXEC) || (flags & DC_QUERY_COST)) {
+		return res;
+	}
+
+	/* Restore _cmd_text */
+	_cmd_text = tmp_cmdtext;
+
+	/* If we did a DC_EXEC, and the command did not return an error, execute it
+	 * over the network */
+	if (flags & DC_AUTO)     procc |= CMD_AUTO;
+	if (flags & DC_NO_WATER) procc |= CMD_NO_WATER;
+
+	/* NetworkSend_Command needs _local_player to be set correctly, so
+	 * adjust it, and put it back right after the function */
+	old_lp = _local_player;
+	_local_player = _current_player;
+
+#ifdef ENABLE_NETWORK
+	/* Send the command */
+	if (_networking) {
+		/* Network is easy, send it to his handler */
+		NetworkSend_Command(tile, p1, p2, procc, callback);
+	} else {
+#else
+	{
+#endif
+		/* If we execute BuildCommands directly in SP, we have a big problem with events
+		 *  so we need to delay is for 1 tick */
+		AI_PutCommandInQueue(_current_player, tile, p1, p2, procc, callback);
+	}
+
+	/* Set _local_player back */
+	_local_player = old_lp;
+
+	return res;
+}
+
+
+int32 AI_DoCommand(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint procc)
+{
+	return AI_DoCommandCc(tile, p1, p2, flags, procc, NULL);
+}
+
+
+/**
+ * Run 1 tick of the AI. Don't overdo it, keep it realistic.
+ */
+static void AI_RunTick(PlayerID player)
+{
+	extern void AiNewDoGameLoop(Player *p);
+
+	Player *p = GetPlayer(player);
+	_current_player = player;
+
+	if (_patches.ainew_active) {
+		AiNewDoGameLoop(p);
+	} else {
+		/* Enable all kind of cheats the old AI needs in order to operate correctly... */
+		_is_old_ai_player = true;
+		AiDoGameLoop(p);
+		_is_old_ai_player = false;
+	}
+}
+
+
+/**
+ * The gameloop for AIs.
+ *  Handles one tick for all the AIs.
+ */
+void AI_RunGameLoop(void)
+{
+	/* Don't do anything if ai is disabled */
+	if (!_ai.enabled) return;
+
+	/* Don't do anything if we are a network-client, or the AI has been disabled */
+	if (_networking && (!_network_server || !_patches.ai_in_multiplayer)) return;
+
+	/* New tick */
+	_ai.tick++;
+
+	/* Make sure the AI follows the difficulty rule.. */
+	assert(_opt.diff.competitor_speed <= 4);
+	if ((_ai.tick & ((1 << (4 - _opt.diff.competitor_speed)) - 1)) != 0) return;
+
+	/* Check for AI-client (so joining a network with an AI) */
+	if (!_networking || _network_server) {
+		/* Check if we want to run AIs (server or SP only) */
+		const Player* p;
+
+		FOR_ALL_PLAYERS(p) {
+			if (p->is_active && p->is_ai) {
+				/* This should always be true, else something went wrong... */
+				assert(_ai_player[p->index].active);
+
+				/* Run the script */
+				AI_DequeueCommands(p->index);
+				AI_RunTick(p->index);
+			}
+		}
+	}
+
+	_current_player = OWNER_NONE;
+}
+
+/**
+ * A new AI sees the day of light. You can do here what ever you think is needed.
+ */
+void AI_StartNewAI(PlayerID player)
+{
+	assert(IsValidPlayer(player));
+
+	/* Called if a new AI is booted */
+	_ai_player[player].active = true;
+}
+
+/**
+ * This AI player died. Give it some chance to make a final puf.
+ */
+void AI_PlayerDied(PlayerID player)
+{
+	/* Called if this AI died */
+	_ai_player[player].active = false;
+}
+
+/**
+ * Initialize some AI-related stuff.
+ */
+void AI_Initialize(void)
+{
+	/* First, make sure all AIs are DEAD! */
+	AI_Uninitialize();
+
+	memset(&_ai, 0, sizeof(_ai));
+	memset(&_ai_player, 0, sizeof(_ai_player));
+
+	_ai.enabled = true;
+}
+
+/**
+ * Deinitializer for AI-related stuff.
+ */
+void AI_Uninitialize(void)
+{
+	const Player* p;
+
+	FOR_ALL_PLAYERS(p) {
+		if (p->is_active && p->is_ai) AI_PlayerDied(p->index);
+	}
+}

deleted file mode 100644
--- a/src/ai/default/default.c
+++ /dev/null
@@ -1,3934 +0,0 @@
-/* $Id$ */
-
-#include "../../stdafx.h"
-#include "../../openttd.h"
-#include "../../aircraft.h"
-#include "../../bridge_map.h"
-#include "../../functions.h"
-#include "../../map.h"
-#include "../../rail_map.h"
-#include "../../road_map.h"
-#include "../../roadveh.h"
-#include "../../station_map.h"
-#include "../../tile.h"
-#include "../../player.h"
-#include "../../tunnel_map.h"
-#include "../../vehicle.h"
-#include "../../engine.h"
-#include "../../command.h"
-#include "../../town.h"
-#include "../../industry.h"
-#include "../../station.h"
-#include "../../pathfind.h"
-#include "../../economy.h"
-#include "../../airport.h"
-#include "../../depot.h"
-#include "../../variables.h"
-#include "../../bridge.h"
-#include "../../date.h"
-#include "default.h"
-
-// remove some day perhaps?
-static uint _ai_service_interval;
-
-typedef void AiStateAction(Player *p);
-
-enum {
-	AIS_0                            =  0,
-	AIS_1                            =  1,
-	AIS_VEH_LOOP                     =  2,
-	AIS_VEH_CHECK_REPLACE_VEHICLE    =  3,
-	AIS_VEH_DO_REPLACE_VEHICLE       =  4,
-	AIS_WANT_NEW_ROUTE               =  5,
-	AIS_BUILD_DEFAULT_RAIL_BLOCKS    =  6,
-	AIS_BUILD_RAIL                   =  7,
-	AIS_BUILD_RAIL_VEH               =  8,
-	AIS_DELETE_RAIL_BLOCKS           =  9,
-	AIS_BUILD_DEFAULT_ROAD_BLOCKS    = 10,
-	AIS_BUILD_ROAD                   = 11,
-	AIS_BUILD_ROAD_VEHICLES          = 12,
-	AIS_DELETE_ROAD_BLOCKS           = 13,
-	AIS_AIRPORT_STUFF                = 14,
-	AIS_BUILD_DEFAULT_AIRPORT_BLOCKS = 15,
-	AIS_BUILD_AIRCRAFT_VEHICLES      = 16,
-	AIS_CHECK_SHIP_STUFF             = 17,
-	AIS_BUILD_DEFAULT_SHIP_BLOCKS    = 18,
-	AIS_DO_SHIP_STUFF                = 19,
-	AIS_SELL_VEHICLE                 = 20,
-	AIS_REMOVE_STATION               = 21,
-	AIS_REMOVE_TRACK                 = 22,
-	AIS_REMOVE_SINGLE_RAIL_TILE      = 23
-};
-
-
-#include "../../table/ai_rail.h"
-
-static byte GetRailTrackStatus(TileIndex tile)
-{
-	uint32 r = GetTileTrackStatus(tile, TRANSPORT_RAIL);
-	return (byte) (r | r >> 8);
-}
-
-
-static void AiCase0(Player *p)
-{
-	p->ai.state = AIS_REMOVE_TRACK;
-	p->ai.state_counter = 0;
-}
-
-static void AiCase1(Player *p)
-{
-	p->ai.cur_veh = NULL;
-	p->ai.state = AIS_VEH_LOOP;
-}
-
-static void AiStateVehLoop(Player *p)
-{
-	Vehicle *v;
-	uint index;
-
-	index = (p->ai.cur_veh == NULL) ? 0 : p->ai.cur_veh->index + 1;
-
-	FOR_ALL_VEHICLES_FROM(v, index) {
-		if (v->owner != _current_player) continue;
-
-		if ((v->type == VEH_Train && v->subtype == 0) ||
-				v->type == VEH_Road ||
-				(v->type == VEH_Aircraft && v->subtype <= 2) ||
-				v->type == VEH_Ship) {
-			/* replace engine? */
-			if (v->type == VEH_Train && v->engine_type < 3 &&
-					(_price.build_railvehicle >> 3) < p->player_money) {
-				p->ai.state = AIS_VEH_CHECK_REPLACE_VEHICLE;
-				p->ai.cur_veh = v;
-				return;
-			}
-
-			/* not profitable? */
-			if (v->age >= 730 &&
-					v->profit_last_year < _price.station_value * 5 &&
-					v->profit_this_year < _price.station_value * 5) {
-				p->ai.state_counter = 0;
-				p->ai.state = AIS_SELL_VEHICLE;
-				p->ai.cur_veh = v;
-				return;
-			}
-
-			/* not reliable? */
-			if (v->age >= v->max_age || (
-						v->age != 0 &&
-						GetEngine(v->engine_type)->reliability < 35389
-					)) {
-				p->ai.state = AIS_VEH_CHECK_REPLACE_VEHICLE;
-				p->ai.cur_veh = v;
-				return;
-			}
-		}
-	}
-
-	p->ai.state = AIS_WANT_NEW_ROUTE;
-	p->ai.state_counter = 0;
-}
-
-static EngineID AiChooseTrainToBuild(RailType railtype, int32 money, byte flag, TileIndex tile)
-{
-	EngineID best_veh_index = INVALID_ENGINE;
-	byte best_veh_score = 0;
-	int32 ret;
-	EngineID i;
-
-	for (i = 0; i < NUM_TRAIN_ENGINES; i++) {
-		const RailVehicleInfo *rvi = RailVehInfo(i);
-		const Engine* e = GetEngine(i);
-
-		if (!IsCompatibleRail(e->railtype, railtype) ||
-				rvi->flags & RVI_WAGON ||
-				(rvi->flags & RVI_MULTIHEAD && flag & 1) ||
-				!HASBIT(e->player_avail, _current_player) ||
-				e->reliability < 0x8A3D) {
-			continue;
-		}
-
-		ret = DoCommand(tile, i, 0, 0, CMD_BUILD_RAIL_VEHICLE);
-		if (!CmdFailed(ret) && ret <= money && rvi->ai_rank >= best_veh_score) {
-			best_veh_score = rvi->ai_rank;
-			best_veh_index = i;
-		}
-	}
-
-	return best_veh_index;
-}
-
-static EngineID AiChooseRoadVehToBuild(CargoID cargo, int32 money, TileIndex tile)
-{
-	EngineID best_veh_index = INVALID_ENGINE;
-	int32 best_veh_rating = 0;
-	EngineID i = ROAD_ENGINES_INDEX;
-	EngineID end = i + NUM_ROAD_ENGINES;
-
-	for (; i != end; i++) {
-		const RoadVehicleInfo *rvi = RoadVehInfo(i);
-		const Engine* e = GetEngine(i);
-		int32 rating;
-		int32 ret;
-
-		if (!HASBIT(e->player_avail, _current_player) || e->reliability < 0x8A3D) {
-			continue;
-		}
-
-		/* Skip vehicles which can't take our cargo type */
-		if (rvi->cargo_type != cargo && !CanRefitTo(i, cargo)) continue;
-
-		/* Rate and compare the engine by speed & capacity */
-		rating = rvi->max_speed * rvi->capacity;
-		if (rating <= best_veh_rating) continue;
-
-		ret = DoCommand(tile, i, 0, 0, CMD_BUILD_ROAD_VEH);
-		if (CmdFailed(ret)) continue;
-
-		/* Add the cost of refitting */
-		if (rvi->cargo_type != cargo) ret += GetRefitCost(i);
-		if (ret > money) continue;
-
-		best_veh_rating = rating;
-		best_veh_index = i;
-	}
-
-	return best_veh_index;
-}
-
-static EngineID AiChooseAircraftToBuild(int32 money, byte flag)
-{
-	EngineID best_veh_index = INVALID_ENGINE;
-	int32 best_veh_cost = 0;
-	EngineID i;
-
-	for (i = AIRCRAFT_ENGINES_INDEX; i != AIRCRAFT_ENGINES_INDEX + NUM_AIRCRAFT_ENGINES; i++) {
-		const Engine* e = GetEngine(i);
-		int32 ret;
-
-		if (!HASBIT(e->player_avail, _current_player) || e->reliability < 0x8A3D) {
-			continue;
-		}
-
-		if ((AircraftVehInfo(i)->subtype & AIR_CTOL) != flag) continue;
-
-		ret = DoCommand(0, i, 0, DC_QUERY_COST, CMD_BUILD_AIRCRAFT);
-		if (!CmdFailed(ret) && ret <= money && ret >= best_veh_cost) {
-			best_veh_cost = ret;
-			best_veh_index = i;
-		}
-	}
-
-	return best_veh_index;
-}
-
-static int32 AiGetBasePrice(const Player* p)
-{
-	int32 base = _price.station_value;
-
-	// adjust base price when more expensive vehicles are available
-	switch (p->ai.railtype_to_use) {
-		default: NOT_REACHED();
-		case RAILTYPE_RAIL:     break;
-		case RAILTYPE_ELECTRIC: break;
-		case RAILTYPE_MONO:     base = (base * 3) >> 1; break;
-		case RAILTYPE_MAGLEV:   base *= 2; break;
-	}
-
-	return base;
-}
-
-#if 0
-static EngineID AiChooseShipToBuild(byte cargo, int32 money)
-{
-	// XXX: not done
-	return INVALID_ENGINE;
-}
-#endif
-
-static EngineID AiChooseRoadVehToReplaceWith(const Player* p, const Vehicle* v)
-{
-	int32 avail_money = p->player_money + v->value;
-	return AiChooseRoadVehToBuild(v->cargo_type, avail_money, v->tile);
-}
-
-static EngineID AiChooseAircraftToReplaceWith(const Player* p, const Vehicle* v)
-{
-	int32 avail_money = p->player_money + v->value;
-	return AiChooseAircraftToBuild(
-		avail_money, AircraftVehInfo(v->engine_type)->subtype & AIR_CTOL
-	);
-}
-
-static EngineID AiChooseTrainToReplaceWith(const Player* p, const Vehicle* v)
-{
-	int32 avail_money = p->player_money + v->value;
-	const Vehicle* u = v;
-	int num = 0;
-
-	while (++num, u->next != NULL) {
-		u = u->next;
-	}
-
-	// XXX: check if a wagon
-	return AiChooseTrainToBuild(v->u.rail.railtype, avail_money, 0, v->tile);
-}
-
-static EngineID AiChooseShipToReplaceWith(const Player* p, const Vehicle* v)
-{
-	error("!AiChooseShipToReplaceWith");
-
-	/* maybe useless, but avoids compiler warning this way */
-	return INVALID_ENGINE;
-}
-
-static void AiHandleGotoDepot(Player *p, int cmd)
-{
-	if (p->ai.cur_veh->current_order.type != OT_GOTO_DEPOT)
-		DoCommand(0, p->ai.cur_veh->index, 0, DC_EXEC, cmd);
-
-	if (++p->ai.state_counter <= 1387) {
-		p->ai.state = AIS_VEH_DO_REPLACE_VEHICLE;
-		return;
-	}
-
-	if (p->ai.cur_veh->current_order.type == OT_GOTO_DEPOT) {
-		p->ai.cur_veh->current_order.type = OT_DUMMY;
-		p->ai.cur_veh->current_order.flags = 0;
-		InvalidateWindow(WC_VEHICLE_VIEW, p->ai.cur_veh->index);
-	}
-}
-
-static void AiRestoreVehicleOrders(Vehicle *v, BackuppedOrders *bak)
-{
-	uint i;
-
-	for (i = 0; bak->order[i].type != OT_NOTHING; i++) {
-		if (!DoCommandP(0, v->index + (i << 16), PackOrder(&bak->order[i]), NULL, CMD_INSERT_ORDER | CMD_NO_TEST_IF_IN_NETWORK))
-			break;
-	}
-}
-
-static void AiHandleReplaceTrain(Player *p)
-{
-	const Vehicle* v = p->ai.cur_veh;
-	BackuppedOrders orderbak[1];
-	EngineID veh;
-
-	// wait until the vehicle reaches the depot.
-	if (!IsTileDepotType(v->tile, TRANSPORT_RAIL) || v->u.rail.track != 0x80 || !(v->vehstatus&VS_STOPPED)) {
-		AiHandleGotoDepot(p, CMD_SEND_TRAIN_TO_DEPOT);
-		return;
-	}
-
-	veh = AiChooseTrainToReplaceWith(p, v);
-	if (veh != INVALID_ENGINE) {
-		TileIndex tile;
-
-		BackupVehicleOrders(v, orderbak);
-		tile = v->tile;
-
-		if (!CmdFailed(DoCommand(0, v->index, 2, DC_EXEC, CMD_SELL_RAIL_WAGON)) &&
-				!CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE))) {
-			VehicleID veh = _new_vehicle_id;
-			AiRestoreVehicleOrders(GetVehicle(veh), orderbak);
-			DoCommand(0, veh, 0, DC_EXEC, CMD_START_STOP_TRAIN);
-
-			DoCommand(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
-		}
-	}
-}
-
-static void AiHandleReplaceRoadVeh(Player *p)
-{
-	const Vehicle* v = p->ai.cur_veh;
-	BackuppedOrders orderbak[1];
-	EngineID veh;
-
-	if (!IsRoadVehInDepotStopped(v)) {
-		AiHandleGotoDepot(p, CMD_SEND_ROADVEH_TO_DEPOT);
-		return;
-	}
-
-	veh = AiChooseRoadVehToReplaceWith(p, v);
-	if (veh != INVALID_ENGINE) {
-		TileIndex tile;
-
-		BackupVehicleOrders(v, orderbak);
-		tile = v->tile;
-
-		if (!CmdFailed(DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_ROAD_VEH)) &&
-				!CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_ROAD_VEH))) {
-			VehicleID veh = _new_vehicle_id;
-
-			AiRestoreVehicleOrders(GetVehicle(veh), orderbak);
-			DoCommand(0, veh, 0, DC_EXEC, CMD_START_STOP_ROADVEH);
-			DoCommand(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
-		}
-	}
-}
-
-static void AiHandleReplaceAircraft(Player *p)
-{
-	const Vehicle* v = p->ai.cur_veh;
-	BackuppedOrders orderbak[1];
-	EngineID veh;
-
-	if (!IsAircraftInHangarStopped(v)) {
-		AiHandleGotoDepot(p, CMD_SEND_AIRCRAFT_TO_HANGAR);
-		return;
-	}
-
-	veh = AiChooseAircraftToReplaceWith(p, v);
-	if (veh != INVALID_ENGINE) {
-		TileIndex tile;
-
-		BackupVehicleOrders(v, orderbak);
-		tile = v->tile;
-
-		if (!CmdFailed(DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_AIRCRAFT)) &&
-				!CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_AIRCRAFT))) {
-			VehicleID veh = _new_vehicle_id;
-			AiRestoreVehicleOrders(GetVehicle(veh), orderbak);
-			DoCommand(0, veh, 0, DC_EXEC, CMD_START_STOP_AIRCRAFT);
-
-			DoCommand(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
-		}
-	}
-}
-
-static void AiHandleReplaceShip(Player *p)
-{
-	error("!AiHandleReplaceShip");
-}
-
-typedef EngineID CheckReplaceProc(const Player* p, const Vehicle* v);
-
-static CheckReplaceProc* const _veh_check_replace_proc[] = {
-	AiChooseTrainToReplaceWith,
-	AiChooseRoadVehToReplaceWith,
-	AiChooseShipToReplaceWith,
-	AiChooseAircraftToReplaceWith,
-};
-
-typedef void DoReplaceProc(Player *p);
-static DoReplaceProc* const _veh_do_replace_proc[] = {
-	AiHandleReplaceTrain,
-	AiHandleReplaceRoadVeh,
-	AiHandleReplaceShip,
-	AiHandleReplaceAircraft
-};
-
-static void AiStateCheckReplaceVehicle(Player *p)
-{
-	const Vehicle* v = p->ai.cur_veh;
-
-	if (!IsValidVehicle(v) ||
-			v->owner != _current_player ||
-			v->type > VEH_Ship ||
-			_veh_check_replace_proc[v->type - VEH_Train](p, v) == INVALID_ENGINE) {
-		p->ai.state = AIS_VEH_LOOP;
-	} else {
-		p->ai.state_counter = 0;
-		p->ai.state = AIS_VEH_DO_REPLACE_VEHICLE;
-	}
-}
-
-static void AiStateDoReplaceVehicle(Player *p)
-{
-	const Vehicle* v = p->ai.cur_veh;
-
-	p->ai.state = AIS_VEH_LOOP;
-	// vehicle is not owned by the player anymore, something went very wrong.
-	if (!IsValidVehicle(v) || v->owner != _current_player) return;
-	_veh_do_replace_proc[v->type - VEH_Train](p);
-}
-
-typedef struct FoundRoute {
-	int distance;
-	CargoID cargo;
-	void *from;
-	void *to;
-} FoundRoute;
-
-static Town *AiFindRandomTown(void)
-{
-	return GetRandomTown();
-}
-
-static Industry *AiFindRandomIndustry(void)
-{
-	return GetRandomIndustry();
-}
-
-static void AiFindSubsidyIndustryRoute(FoundRoute *fr)
-{
-	uint i;
-	CargoID cargo;
-	const Subsidy* s;
-	Industry* from;
-	TileIndex to_xy;
-
-	// initially error
-	fr->distance = -1;
-
-	// Randomize subsidy index..
-	i = RandomRange(lengthof(_subsidies) * 3);
-	if (i >= lengthof(_subsidies)) return;
-
-	s = &_subsidies[i];
-
-	// Don't want passengers or mail
-	cargo = s->cargo_type;
-	if (cargo == CT_INVALID ||
-			cargo == CT_PASSENGERS ||
-			cargo == CT_MAIL ||
-			s->age > 7) {
-		return;
-	}
-	fr->cargo = cargo;
-
-	fr->from = from = GetIndustry(s->from);
-
-	if (cargo == CT_GOODS || cargo == CT_FOOD) {
-		Town* to_tow = GetTown(s->to);
-
-		if (to_tow->population < (cargo == CT_FOOD ? 200U : 900U)) return; // error
-		fr->to = to_tow;
-		to_xy = to_tow->xy;
-	} else {
-		Industry* to_ind = GetIndustry(s->to);
-
-		fr->to = to_ind;
-		to_xy = to_ind->xy;
-	}
-
-	fr->distance = DistanceManhattan(from->xy, to_xy);
-}
-
-static void AiFindSubsidyPassengerRoute(FoundRoute *fr)
-{
-	uint i;
-	const Subsidy* s;
-	Town *from,*to;
-
-	// initially error
-	fr->distance = -1;
-
-	// Randomize subsidy index..
-	i = RandomRange(lengthof(_subsidies) * 3);
-	if (i >= lengthof(_subsidies)) return;
-
-	s = &_subsidies[i];
-
-	// Only want passengers
-	if (s->cargo_type != CT_PASSENGERS || s->age > 7) return;
-	fr->cargo = s->cargo_type;
-
-	fr->from = from = GetTown(s->from);
-	fr->to = to = GetTown(s->to);
-
-	// They must be big enough
-	if (from->population < 400 || to->population < 400) return;
-
-	fr->distance = DistanceManhattan(from->xy, to->xy);
-}
-
-static void AiFindRandomIndustryRoute(FoundRoute *fr)
-{
-	Industry* i;
-	uint32 r;
-	CargoID cargo;
-
-	// initially error
-	fr->distance = -1;
-
-	r = Random();
-
-	// pick a source
-	fr->from = i = AiFindRandomIndustry();
-	if (i == NULL) return;
-
-	// pick a random produced cargo
-	cargo = i->produced_cargo[0];
-	if (r & 1 && i->produced_cargo[1] != CT_INVALID) cargo = i->produced_cargo[1];
-
-	fr->cargo = cargo;
-
-	// don't allow passengers
-	if (cargo == CT_INVALID || cargo == CT_PASSENGERS) return;
-
-	if (cargo != CT_GOODS && cargo != CT_FOOD) {
-		// pick a dest, and see if it can receive
-		Industry* i2 = AiFindRandomIndustry();
-
-		if (i2 == NULL || i == i2 || (
-					i2->accepts_cargo[0] != cargo &&
-					i2->accepts_cargo[1] != cargo &&
-					i2->accepts_cargo[2] != cargo)
-				) {
-			return;
-		}
-
-		fr->to = i2;
-		fr->distance = DistanceManhattan(i->xy, i2->xy);
-	} else {
-		// pick a dest town, and see if it's big enough
-		Town* t = AiFindRandomTown();
-
-		if (t == NULL || t->population < (cargo == CT_FOOD ? 200U : 900U)) return;
-
-		fr->to = t;
-		fr->distance = DistanceManhattan(i->xy, t->xy);
-	}
-}
-
-static void AiFindRandomPassengerRoute(FoundRoute *fr)
-{
-	Town* source;
-	Town* dest;
-
-	// initially error
-	fr->distance = -1;
-
-	fr->from = source = AiFindRandomTown();
-	if (source == NULL || source->population < 400) return;
-
-	fr->to = dest = AiFindRandomTown();
-	if (dest == NULL || source == dest || dest->population < 400) return;
-
-	fr->distance = DistanceManhattan(source->xy, dest->xy);
-}
-
-// Warn: depends on 'xy' being the first element in both Town and Industry
-#define GET_TOWN_OR_INDUSTRY_TILE(p) (((Town*)(p))->xy)
-
-static bool AiCheckIfRouteIsGood(Player *p, FoundRoute *fr, byte bitmask)
-{
-	TileIndex from_tile, to_tile;
-	Station *st;
-	int dist;
-	uint same_station = 0;
-
-	// Make sure distance to closest station is < 37 pixels.
-	from_tile = GET_TOWN_OR_INDUSTRY_TILE(fr->from);
-	to_tile = GET_TOWN_OR_INDUSTRY_TILE(fr->to);
-
-	dist = 0xFFFF;
-	FOR_ALL_STATIONS(st) {
-		int cur;
-
-		if (st->owner != _current_player) continue;
-		cur = DistanceMax(from_tile, st->xy);
-		if (cur < dist) dist = cur;
-		cur = DistanceMax(to_tile, st->xy);
-		if (cur < dist) dist = cur;
-		if (to_tile == from_tile && st->xy == to_tile) same_station++;
-	}
-
-	// To prevent the AI from building ten busstations in the same town, do some calculations
-	//  For each road or airport station, we want 350 of population!
-	if ((bitmask == 2 || bitmask == 4) &&
-			same_station > 2 &&
-			((Town*)fr->from)->population < same_station * 350) {
-		return false;
-	}
-
-	if (dist != 0xFFFF && dist > 37) return false;
-
-	if (p->ai.route_type_mask != 0 &&
-			!(p->ai.route_type_mask & bitmask) &&
-			!CHANCE16(1, 5)) {
-		return false;
-	}
-
-	if (fr->cargo == CT_PASSENGERS || fr->cargo == CT_MAIL) {
-		const Town* from = fr->from;
-		const Town* to   = fr->to;
-
-		if (from->pct_pass_transported > 0x99 ||
-				to->pct_pass_transported > 0x99) {
-			return false;
-		}
-
-		// Make sure it has a reasonably good rating
-		if (from->ratings[_current_player] < -100 ||
-				to->ratings[_current_player] < -100) {
-			return false;
-		}
-	} else {
-		const Industry* i = (const Industry*)fr->from;
-
-		if (i->pct_transported[fr->cargo != i->produced_cargo[0]] > 0x99 ||
-				i->total_production[fr->cargo != i->produced_cargo[0]] == 0) {
-			return false;
-		}
-	}
-
-	p->ai.route_type_mask |= bitmask;
-	return true;
-}
-
-static byte AiGetDirectionBetweenTiles(TileIndex a, TileIndex b)
-{
-	byte i = (TileX(a) < TileX(b)) ? 1 : 0;
-	if (TileY(a) >= TileY(b)) i ^= 3;
-	return i;
-}
-
-static TileIndex AiGetPctTileBetween(TileIndex a, TileIndex b, byte pct)
-{
-	return TileXY(
-		TileX(a) + ((TileX(b) - TileX(a)) * pct >> 8),
-		TileY(a) + ((TileY(b) - TileY(a)) * pct >> 8)
-	);
-}
-
-static void AiWantLongIndustryRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 60, 90 + 1)) break;
-
-		// try a random one
-		AiFindRandomIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 60, 90 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	if (!AiCheckIfRouteIsGood(p, &fr, 1)) return;
-
-	// Fill the source field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 9;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.unk6 = 1;
-	p->ai.src.unk7 = 0;
-	p->ai.src.buildcmd_a = 0x24;
-	p->ai.src.buildcmd_b = 0xFF;
-	p->ai.src.direction = AiGetDirectionBetweenTiles(
-		p->ai.src.spec_tile,
-		p->ai.dst.spec_tile
-	);
-	p->ai.src.cargo = fr.cargo | 0x80;
-
-	// Fill the dest field
-
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 9;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.unk6 = 1;
-	p->ai.dst.unk7 = 0;
-	p->ai.dst.buildcmd_a = 0x34;
-	p->ai.dst.buildcmd_b = 0xFF;
-	p->ai.dst.direction = AiGetDirectionBetweenTiles(
-		p->ai.dst.spec_tile,
-		p->ai.src.spec_tile
-	);
-	p->ai.dst.cargo = fr.cargo;
-
-	// Fill middle field 1
-	p->ai.mid1.spec_tile = AiGetPctTileBetween(
-		p->ai.src.spec_tile,
-		p->ai.dst.spec_tile,
-		0x55
-	);
-	p->ai.mid1.use_tile = 0;
-	p->ai.mid1.rand_rng = 6;
-	p->ai.mid1.cur_building_rule = 0xFF;
-	p->ai.mid1.unk6 = 2;
-	p->ai.mid1.unk7 = 1;
-	p->ai.mid1.buildcmd_a = 0x30;
-	p->ai.mid1.buildcmd_b = 0xFF;
-	p->ai.mid1.direction = p->ai.src.direction;
-	p->ai.mid1.cargo = fr.cargo;
-
-	// Fill middle field 2
-	p->ai.mid2.spec_tile = AiGetPctTileBetween(
-		p->ai.src.spec_tile,
-		p->ai.dst.spec_tile,
-		0xAA
-	);
-	p->ai.mid2.use_tile = 0;
-	p->ai.mid2.rand_rng = 6;
-	p->ai.mid2.cur_building_rule = 0xFF;
-	p->ai.mid2.unk6 = 2;
-	p->ai.mid2.unk7 = 1;
-	p->ai.mid2.buildcmd_a = 0xFF;
-	p->ai.mid2.buildcmd_b = 0xFF;
-	p->ai.mid2.direction = p->ai.dst.direction;
-	p->ai.mid2.cargo = fr.cargo;
-
-	// Fill common fields
-	p->ai.cargo_type = fr.cargo;
-	p->ai.num_wagons = 3;
-	p->ai.build_kind = 2;
-	p->ai.num_build_rec = 4;
-	p->ai.num_loco_to_build = 2;
-	p->ai.num_want_fullload = 2;
-	p->ai.wagon_list[0] = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-
-	p->ai.state = AIS_BUILD_DEFAULT_RAIL_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantMediumIndustryRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 40, 60 + 1)) break;
-
-		// try a random one
-		AiFindRandomIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 40, 60 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	if (!AiCheckIfRouteIsGood(p, &fr, 1)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 9;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.unk6 = 1;
-	p->ai.src.unk7 = 0;
-	p->ai.src.buildcmd_a = 0x10;
-	p->ai.src.buildcmd_b = 0xFF;
-	p->ai.src.direction = AiGetDirectionBetweenTiles(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to)
-	);
-	p->ai.src.cargo = fr.cargo | 0x80;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 9;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.unk6 = 1;
-	p->ai.dst.unk7 = 0;
-	p->ai.dst.buildcmd_a = 0xFF;
-	p->ai.dst.buildcmd_b = 0xFF;
-	p->ai.dst.direction = AiGetDirectionBetweenTiles(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from)
-	);
-	p->ai.dst.cargo = fr.cargo;
-
-	// Fill common fields
-	p->ai.cargo_type = fr.cargo;
-	p->ai.num_wagons = 3;
-	p->ai.build_kind = 1;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 1;
-	p->ai.num_want_fullload = 1;
-	p->ai.wagon_list[0] = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-	p->ai.state = AIS_BUILD_DEFAULT_RAIL_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantShortIndustryRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 15, 40 + 1)) break;
-
-		// try a random one
-		AiFindRandomIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 15, 40 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	if (!AiCheckIfRouteIsGood(p, &fr, 1)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 9;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.unk6 = 1;
-	p->ai.src.unk7 = 0;
-	p->ai.src.buildcmd_a = 0x10;
-	p->ai.src.buildcmd_b = 0xFF;
-	p->ai.src.direction = AiGetDirectionBetweenTiles(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to)
-	);
-	p->ai.src.cargo = fr.cargo | 0x80;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 9;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.unk6 = 1;
-	p->ai.dst.unk7 = 0;
-	p->ai.dst.buildcmd_a = 0xFF;
-	p->ai.dst.buildcmd_b = 0xFF;
-	p->ai.dst.direction = AiGetDirectionBetweenTiles(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from)
-	);
-	p->ai.dst.cargo = fr.cargo;
-
-	// Fill common fields
-	p->ai.cargo_type = fr.cargo;
-	p->ai.num_wagons = 2;
-	p->ai.build_kind = 1;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 1;
-	p->ai.num_want_fullload = 1;
-	p->ai.wagon_list[0] = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-	p->ai.state = AIS_BUILD_DEFAULT_RAIL_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantMailRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyPassengerRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 60, 110 + 1)) break;
-
-		// try a random one
-		AiFindRandomPassengerRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 60, 110 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	fr.cargo = CT_MAIL;
-	if (!AiCheckIfRouteIsGood(p, &fr, 1)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 7;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.unk6 = 1;
-	p->ai.src.unk7 = 0;
-	p->ai.src.buildcmd_a = 0x24;
-	p->ai.src.buildcmd_b = 0xFF;
-	p->ai.src.direction = AiGetDirectionBetweenTiles(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to)
-	);
-	p->ai.src.cargo = fr.cargo;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 7;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.unk6 = 1;
-	p->ai.dst.unk7 = 0;
-	p->ai.dst.buildcmd_a = 0x34;
-	p->ai.dst.buildcmd_b = 0xFF;
-	p->ai.dst.direction = AiGetDirectionBetweenTiles(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from)
-	);
-	p->ai.dst.cargo = fr.cargo;
-
-	// Fill middle field 1
-	p->ai.mid1.spec_tile = AiGetPctTileBetween(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to),
-		0x55
-	);
-	p->ai.mid1.use_tile = 0;
-	p->ai.mid1.rand_rng = 6;
-	p->ai.mid1.cur_building_rule = 0xFF;
-	p->ai.mid1.unk6 = 2;
-	p->ai.mid1.unk7 = 1;
-	p->ai.mid1.buildcmd_a = 0x30;
-	p->ai.mid1.buildcmd_b = 0xFF;
-	p->ai.mid1.direction = p->ai.src.direction;
-	p->ai.mid1.cargo = fr.cargo;
-
-	// Fill middle field 2
-	p->ai.mid2.spec_tile = AiGetPctTileBetween(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to),
-		0xAA
-	);
-	p->ai.mid2.use_tile = 0;
-	p->ai.mid2.rand_rng = 6;
-	p->ai.mid2.cur_building_rule = 0xFF;
-	p->ai.mid2.unk6 = 2;
-	p->ai.mid2.unk7 = 1;
-	p->ai.mid2.buildcmd_a = 0xFF;
-	p->ai.mid2.buildcmd_b = 0xFF;
-	p->ai.mid2.direction = p->ai.dst.direction;
-	p->ai.mid2.cargo = fr.cargo;
-
-	// Fill common fields
-	p->ai.cargo_type = fr.cargo;
-	p->ai.num_wagons = 3;
-	p->ai.build_kind = 2;
-	p->ai.num_build_rec = 4;
-	p->ai.num_loco_to_build = 2;
-	p->ai.num_want_fullload = 0;
-	p->ai.wagon_list[0] = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-	p->ai.state = AIS_BUILD_DEFAULT_RAIL_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantPassengerRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyPassengerRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 0, 55 + 1)) break;
-
-		// try a random one
-		AiFindRandomPassengerRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 0, 55 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	fr.cargo = CT_PASSENGERS;
-	if (!AiCheckIfRouteIsGood(p, &fr, 1)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 7;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.unk6 = 1;
-	p->ai.src.unk7 = 0;
-	p->ai.src.buildcmd_a = 0x10;
-	p->ai.src.buildcmd_b = 0xFF;
-	p->ai.src.direction = AiGetDirectionBetweenTiles(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to)
-	);
-	p->ai.src.cargo = fr.cargo;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 7;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.unk6 = 1;
-	p->ai.dst.unk7 = 0;
-	p->ai.dst.buildcmd_a = 0xFF;
-	p->ai.dst.buildcmd_b = 0xFF;
-	p->ai.dst.direction = AiGetDirectionBetweenTiles(
-		GET_TOWN_OR_INDUSTRY_TILE(fr.to),
-		GET_TOWN_OR_INDUSTRY_TILE(fr.from)
-	);
-	p->ai.dst.cargo = fr.cargo;
-
-	// Fill common fields
-	p->ai.cargo_type = fr.cargo;
-	p->ai.num_wagons = 2;
-	p->ai.build_kind = 1;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 1;
-	p->ai.num_want_fullload = 0;
-	p->ai.wagon_list[0] = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-	p->ai.state = AIS_BUILD_DEFAULT_RAIL_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantTrainRoute(Player *p)
-{
-	uint16 r = GB(Random(), 0, 16);
-
-	p->ai.railtype_to_use = GetBestRailtype(p);
-
-	if (r > 0xD000) {
-		AiWantLongIndustryRoute(p);
-	} else if (r > 0x6000) {
-		AiWantMediumIndustryRoute(p);
-	} else if (r > 0x1000) {
-		AiWantShortIndustryRoute(p);
-	} else if (r > 0x800) {
-		AiWantPassengerRoute(p);
-	} else {
-		AiWantMailRoute(p);
-	}
-}
-
-static void AiWantLongRoadIndustryRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 35, 55 + 1)) break;
-
-		// try a random one
-		AiFindRandomIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 35, 55 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	if (!AiCheckIfRouteIsGood(p, &fr, 2)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 9;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.buildcmd_a = 1;
-	p->ai.src.direction = 0;
-	p->ai.src.cargo = fr.cargo | 0x80;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 9;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.buildcmd_a = 0xFF;
-	p->ai.dst.direction = 0;
-	p->ai.dst.cargo = fr.cargo;
-
-	// Fill common fields
-	p->ai.cargo_type = fr.cargo;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 5;
-	p->ai.num_want_fullload = 5;
-
-//	p->ai.loco_id = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-
-	p->ai.state = AIS_BUILD_DEFAULT_ROAD_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantMediumRoadIndustryRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 15, 40 + 1)) break;
-
-		// try a random one
-		AiFindRandomIndustryRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 15, 40 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	if (!AiCheckIfRouteIsGood(p, &fr, 2)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 9;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.buildcmd_a = 1;
-	p->ai.src.direction = 0;
-	p->ai.src.cargo = fr.cargo | 0x80;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 9;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.buildcmd_a = 0xFF;
-	p->ai.dst.direction = 0;
-	p->ai.dst.cargo = fr.cargo;
-
-	// Fill common fields
-	p->ai.cargo_type = fr.cargo;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 3;
-	p->ai.num_want_fullload = 3;
-
-//	p->ai.loco_id = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-
-	p->ai.state = AIS_BUILD_DEFAULT_ROAD_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantLongRoadPassengerRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyPassengerRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 55, 180 + 1)) break;
-
-		// try a random one
-		AiFindRandomPassengerRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 55, 180 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	fr.cargo = CT_PASSENGERS;
-
-	if (!AiCheckIfRouteIsGood(p, &fr, 2)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 10;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.buildcmd_a = 1;
-	p->ai.src.direction = 0;
-	p->ai.src.cargo = CT_PASSENGERS;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 10;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.buildcmd_a = 0xFF;
-	p->ai.dst.direction = 0;
-	p->ai.dst.cargo = CT_PASSENGERS;
-
-	// Fill common fields
-	p->ai.cargo_type = CT_PASSENGERS;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 4;
-	p->ai.num_want_fullload = 0;
-
-//	p->ai.loco_id = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-
-	p->ai.state = AIS_BUILD_DEFAULT_ROAD_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantPassengerRouteInsideTown(Player *p)
-{
-	int i;
-	FoundRoute fr;
-	Town *t;
-
-	i = 60;
-	for (;;) {
-		// Find a town big enough
-		t = AiFindRandomTown();
-		if (t != NULL && t->population >= 700) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	fr.cargo = CT_PASSENGERS;
-	fr.from = fr.to = t;
-
-	if (!AiCheckIfRouteIsGood(p, &fr, 2)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = t->xy;
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 10;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.buildcmd_a = 1;
-	p->ai.src.direction = 0;
-	p->ai.src.cargo = CT_PASSENGERS;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = t->xy;
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 10;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.buildcmd_a = 0xFF;
-	p->ai.dst.direction = 0;
-	p->ai.dst.cargo = CT_PASSENGERS;
-
-	// Fill common fields
-	p->ai.cargo_type = CT_PASSENGERS;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 2;
-	p->ai.num_want_fullload = 0;
-
-//	p->ai.loco_id = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-
-	p->ai.state = AIS_BUILD_DEFAULT_ROAD_BLOCKS;
-	p->ai.state_mode = -1;
-	p->ai.state_counter = 0;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantRoadRoute(Player *p)
-{
-	uint16 r = GB(Random(), 0, 16);
-
-	if (r > 0x4000) {
-		AiWantLongRoadIndustryRoute(p);
-	} else if (r > 0x2000) {
-		AiWantMediumRoadIndustryRoute(p);
-	} else if (r > 0x1000) {
-		AiWantLongRoadPassengerRoute(p);
-	} else {
-		AiWantPassengerRouteInsideTown(p);
-	}
-}
-
-static void AiWantPassengerAircraftRoute(Player *p)
-{
-	FoundRoute fr;
-	int i;
-
-	i = 60;
-	for (;;) {
-		// look for one from the subsidy list
-		AiFindSubsidyPassengerRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 0, 95 + 1)) break;
-
-		// try a random one
-		AiFindRandomPassengerRoute(&fr);
-		if (IS_INT_INSIDE(fr.distance, 0, 95 + 1)) break;
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	fr.cargo = CT_PASSENGERS;
-	if (!AiCheckIfRouteIsGood(p, &fr, 4)) return;
-
-
-	// Fill the source field
-	p->ai.src.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.to);
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 12;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.cargo = fr.cargo;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = GET_TOWN_OR_INDUSTRY_TILE(fr.from);
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 12;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.cargo = fr.cargo;
-
-	// Fill common fields
-	p->ai.cargo_type = fr.cargo;
-	p->ai.build_kind = 0;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 1;
-	p->ai.num_want_fullload = 1;
-//	p->ai.loco_id = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-
-	p->ai.state = AIS_AIRPORT_STUFF;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantOilRigAircraftRoute(Player *p)
-{
-	int i;
-	FoundRoute fr;
-	Town *t;
-	Industry *in;
-
-	i = 60;
-	for (;;) {
-		// Find a town
-		t = AiFindRandomTown();
-		if (t != NULL) {
-			// Find a random oil rig industry
-			in = AiFindRandomIndustry();
-			if (in != NULL && in->type == IT_OIL_RIG) {
-				if (DistanceManhattan(t->xy, in->xy) < 60)
-					break;
-			}
-		}
-
-		// only test 60 times
-		if (--i == 0) return;
-	}
-
-	fr.cargo = CT_PASSENGERS;
-	fr.from = fr.to = t;
-
-	if (!AiCheckIfRouteIsGood(p, &fr, 4)) return;
-
-	// Fill the source field
-	p->ai.src.spec_tile = t->xy;
-	p->ai.src.use_tile = 0;
-	p->ai.src.rand_rng = 12;
-	p->ai.src.cur_building_rule = 0xFF;
-	p->ai.src.cargo = CT_PASSENGERS;
-
-	// Fill the dest field
-	p->ai.dst.spec_tile = in->xy;
-	p->ai.dst.use_tile = 0;
-	p->ai.dst.rand_rng = 5;
-	p->ai.dst.cur_building_rule = 0xFF;
-	p->ai.dst.cargo = CT_PASSENGERS;
-
-	// Fill common fields
-	p->ai.cargo_type = CT_PASSENGERS;
-	p->ai.build_kind = 1;
-	p->ai.num_build_rec = 2;
-	p->ai.num_loco_to_build = 1;
-	p->ai.num_want_fullload = 0;
-//	p->ai.loco_id = INVALID_VEHICLE;
-	p->ai.order_list_blocks[0] = 0;
-	p->ai.order_list_blocks[1] = 1;
-	p->ai.order_list_blocks[2] = 255;
-
-	p->ai.state = AIS_AIRPORT_STUFF;
-	p->ai.timeout_counter = 0;
-}
-
-static void AiWantAircraftRoute(Player *p)
-{
-	uint16 r = (uint16)Random();
-
-	if (r >= 0x2AAA || _date < 0x3912 + DAYS_TILL_ORIGINAL_BASE_YEAR) {
-		AiWantPassengerAircraftRoute(p);
-	} else {
-		AiWantOilRigAircraftRoute(p);
-	}
-}
-
-static void AiWantShipRoute(Player *p)
-{
-	// XXX
-//	error("AiWaitShipRoute");
-}
-
-
-
-static void AiStateWantNewRoute(Player *p)
-{
-	uint16 r;
-	int i;
-
-	if (p->player_money < AiGetBasePrice(p) * 500) {
-		p->ai.state = AIS_0;
-		return;
-	}
-
-	i = 200;
-	for (;;) {
-		r = (uint16)Random();
-
-		if (_patches.ai_disable_veh_train &&
-				_patches.ai_disable_veh_roadveh &&
-				_patches.ai_disable_veh_aircraft &&
-				_patches.ai_disable_veh_ship) {
-			return;
-		}
-
-		if (r < 0x7626) {
-			if (_patches.ai_disable_veh_train) continue;
-			AiWantTrainRoute(p);
-		} else if (r < 0xC4EA) {
-			if (_patches.ai_disable_veh_roadveh) continue;
-			AiWantRoadRoute(p);
-		} else if (r < 0xD89B) {
-			if (_patches.ai_disable_veh_aircraft) continue;
-			AiWantAircraftRoute(p);
-		} else {
-			if (_patches.ai_disable_veh_ship) continue;
-			AiWantShipRoute(p);
-		}
-
-		// got a route?
-		if (p->ai.state != AIS_WANT_NEW_ROUTE) break;
-
-		// time out?
-		if (--i == 0) {
-			if (++p->ai.state_counter == 556) p->ai.state = AIS_0;
-			break;
-		}
-	}
-}
-
-static bool AiCheckTrackResources(TileIndex tile, const AiDefaultBlockData *p, byte cargo)
-{
-	uint rad = (_patches.modified_catchment) ? CA_TRAIN : 4;
-
-	for (; p->mode != 4; p++) {
-		AcceptedCargo values;
-		TileIndex tile2;
-		uint w;
-		uint h;
-
-		if (p->mode != 1) continue;
-
-		tile2 = TILE_ADD(tile, ToTileIndexDiff(p->tileoffs));
-		w = GB(p->attr, 1, 3);
-		h = GB(p->attr, 4, 3);
-
-		if (p->attr & 1) uintswap(w, h);
-
-		if (cargo & 0x80) {
-			GetProductionAroundTiles(values, tile2, w, h, rad);
-			return values[cargo & 0x7F] != 0;
-		} else {
-			GetAcceptanceAroundTiles(values, tile2, w, h, rad);
-			if (!(values[cargo] & ~7))
-				return false;
-			if (cargo != CT_MAIL)
-				return true;
-			return !!((values[cargo]>>1) & ~7);
-		}
-	}
-
-	return true;
-}
-
-static int32 AiDoBuildDefaultRailTrack(TileIndex tile, const AiDefaultBlockData* p, RailType railtype, byte flag)
-{
-	int32 ret;
-	int32 total_cost = 0;
-	Town *t = NULL;
-	int rating = 0;
-	int i,j,k;
-
-	for (;;) {
-		// This will seldomly overflow for valid reasons. Mask it to be on the safe side.
-		uint c = TILE_MASK(tile + ToTileIndexDiff(p->tileoffs));
-
-		_cleared_town = NULL;
-
-		if (p->mode < 2) {
-			if (p->mode == 0) {
-				// Depot
-				ret = DoCommand(c, railtype, p->attr, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_TRAIN_DEPOT);
-			} else {
-				// Station
-				ret = DoCommand(c, (p->attr&1) | (p->attr>>4)<<8 | (p->attr>>1&7)<<16, railtype, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_RAILROAD_STATION);
-			}
-
-			if (CmdFailed(ret)) return CMD_ERROR;
-			total_cost += ret;
-
-clear_town_stuff:;
-			if (_cleared_town != NULL) {
-				if (t != NULL && t != _cleared_town)
-					return CMD_ERROR;
-				t = _cleared_town;
-				rating += _cleared_town_rating;
-			}
-		} else if (p->mode == 2) {
-			// Rail
-			if (IsTileType(c, MP_RAILWAY)) return CMD_ERROR;
-
-			j = p->attr;
-			k = 0;
-
-			// Build the rail
-			for (i = 0; i != 6; i++, j >>= 1) {
-				if (j&1) {
-					k = i;
-					ret = DoCommand(c, railtype, i, flag | DC_AUTO | DC_NO_WATER, CMD_BUILD_SINGLE_RAIL);
-					if (CmdFailed(ret)) return CMD_ERROR;
-					total_cost += ret;
-				}
-			}
-
-			/* signals too? */
-			if (j & 3) {
-				// Can't build signals on a road.
-				if (IsTileType(c, MP_STREET)) return CMD_ERROR;
-
-				if (flag & DC_EXEC) {
-					j = 4 - j;
-					do {
-						ret = DoCommand(c, k, 0, flag, CMD_BUILD_SIGNALS);
-					} while (--j);
-				} else {
-					ret = _price.build_signals;
-				}
-				if (CmdFailed(ret)) return CMD_ERROR;
-				total_cost += ret;
-			}
-		} else if (p->mode == 3) {
-			//Clear stuff and then build single rail.
-			if (GetTileSlope(c, NULL) != SLOPE_FLAT) return CMD_ERROR;
-			ret = DoCommand(c, 0, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_LANDSCAPE_CLEAR);
-			if (CmdFailed(ret)) return CMD_ERROR;
-			total_cost += ret + _price.build_rail;
-
-			if (flag & DC_EXEC) {
-				DoCommand(c, railtype, p->attr&1, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_SINGLE_RAIL);
-			}
-
-			goto clear_town_stuff;
-		} else {
-			// Unk
-			break;
-		}
-
-		p++;
-	}
-
-	if (!(flag & DC_EXEC)) {
-		if (t != NULL && rating > t->ratings[_current_player]) {
-			return CMD_ERROR;
-		}
-	}
-
-	return total_cost;
-}
-
-// Returns rule and cost
-static int AiBuildDefaultRailTrack(TileIndex tile, byte p0, byte p1, byte p2, byte p3, byte dir, byte cargo, RailType railtype, int32* cost)
-{
-	int i;
-	const AiDefaultRailBlock *p;
-
-	for (i = 0; (p = _default_rail_track_data[i]) != NULL; i++) {
-		if (p->p0 == p0 && p->p1 == p1 && p->p2 == p2 && p->p3 == p3 &&
-				(p->dir == 0xFF || p->dir == dir || ((p->dir - 1) & 3) == dir)) {
-			*cost = AiDoBuildDefaultRailTrack(tile, p->data, railtype, DC_NO_TOWN_RATING);
-			if (!CmdFailed(*cost) && AiCheckTrackResources(tile, p->data, cargo))
-				return i;
-		}
-	}
-
-	return -1;
-}
-
-static const byte _terraform_up_flags[] = {
-	14, 13, 12, 11,
-	10,  9,  8,  7,
-	 6,  5,  4,  3,
-	 2,  1,  0,  1,
-	 2,  1,  4,  1,
-	 2,  1,  8,  1,
-	 2,  1,  4,  2,
-	 2,  1
-};
-
-static const byte _terraform_down_flags[] = {
-	1,  2, 3,  4,
-	5,  6, 1,  8,
-	9, 10, 8, 12,
-	4,  2, 0,  0,
-	1,  2, 3,  4,
-	5,  6, 2,  8,
-	9, 10, 1, 12,
-	8,  4
-};
-
-static void AiDoTerraformLand(TileIndex tile, int dir, int unk, int mode)
-{
-	PlayerID old_player;
-	uint32 r;
-	Slope slope;
-	uint h;
-
-	old_player = _current_player;
-	_current_player = OWNER_NONE;
-
-	r = Random();
-
-	unk &= (int)r;
-
-	do {
-		tile = TILE_MASK(tile + TileOffsByDiagDir(dir));
-
-		r >>= 2;
-		if (r & 2) {
-			dir++;
-			if (r & 1) dir -= 2;
-		}
-		dir &= 3;
-	} while (--unk >= 0);
-
-	slope = GetTileSlope(tile, &h);
-
-	if (slope != SLOPE_FLAT) {
-		if (mode > 0 || (mode == 0 && !(r & 0xC))) {
-			// Terraform up
-			DoCommand(tile, _terraform_up_flags[slope - 1], 1,
-				DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_TERRAFORM_LAND);
-		} else if (h != 0) {
-			// Terraform down
-			DoCommand(tile, _terraform_down_flags[slope - 1], 0,
-				DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_TERRAFORM_LAND);
-		}
-	}
-
-	_current_player = old_player;
-}
-
-static void AiStateBuildDefaultRailBlocks(Player *p)
-{
-	uint i;
-	int j;
-	AiBuildRec *aib;
-	int rule;
-	int32 cost;
-
-	// time out?
-	if (++p->ai.timeout_counter == 1388) {
-		p->ai.state = AIS_DELETE_RAIL_BLOCKS;
-		return;
-	}
-
-	// do the following 8 times
-	for (i = 0; i < 8; i++) {
-		// check if we can build the default track
-		aib = &p->ai.src;
-		j = p->ai.num_build_rec;
-		do {
-			// this item has already been built?
-			if (aib->cur_building_rule != 255) continue;
-
-			// adjust the coordinate randomly,
-			// to make sure that we find a position.
-			aib->use_tile = AdjustTileCoordRandomly(aib->spec_tile, aib->rand_rng);
-
-			// check if the track can be build there.
-			rule = AiBuildDefaultRailTrack(aib->use_tile,
-				p->ai.build_kind, p->ai.num_wagons,
-				aib->unk6, aib->unk7,
-				aib->direction, aib->cargo,
-				p->ai.railtype_to_use,
-				&cost
-			);
-
-			if (rule == -1) {
-				// cannot build, terraform after a while
-				if (p->ai.state_counter >= 600) {
-					AiDoTerraformLand(aib->use_tile, Random()&3, 3, (int8)p->ai.state_mode);
-				}
-				// also try the other terraform direction
-				if (++p->ai.state_counter >= 1000) {
-					p->ai.state_counter = 0;
-					p->ai.state_mode = -p->ai.state_mode;
-				}
-			} else if (CheckPlayerHasMoney(cost)) {
-				int32 r;
-				// player has money, build it.
-				aib->cur_building_rule = rule;
-
-				r = AiDoBuildDefaultRailTrack(
-					aib->use_tile,
-					_default_rail_track_data[rule]->data,
-					p->ai.railtype_to_use,
-					DC_EXEC | DC_NO_TOWN_RATING
-				);
-				assert(!CmdFailed(r));
-			}
-		} while (++aib,--j);
-	}
-
-	// check if we're done with all of them
-	aib = &p->ai.src;
-	j = p->ai.num_build_rec;
-	do {
-		if (aib->cur_building_rule == 255) return;
-	} while (++aib,--j);
-
-	// yep, all are done. switch state to the rail building state.
-	p->ai.state = AIS_BUILD_RAIL;
-	p->ai.state_mode = 255;
-}
-
-static TileIndex AiGetEdgeOfDefaultRailBlock(byte rule, TileIndex tile, byte cmd, int *dir)
-{
-	const AiDefaultBlockData *p = _default_rail_track_data[rule]->data;
-
-	while (p->mode != 3 || !((--cmd) & 0x80)) p++;
-
-	return tile + ToTileIndexDiff(p->tileoffs) - TileOffsByDiagDir(*dir = p->attr);
-}
-
-typedef struct AiRailPathFindData {
-	TileIndex tile;
-	TileIndex tile2;
-	int count;
-	bool flag;
-} AiRailPathFindData;
-
-static bool AiEnumFollowTrack(TileIndex tile, AiRailPathFindData *a, int track, uint length, byte *state)
-{
-	if (a->flag) return true;
-
-	if (length > 20 || tile == a->tile) {
-		a->flag = true;
-		return true;
-	}
-
-	if (DistanceMax(tile, a->tile2) < 4) a->count++;
-
-	return false;
-}
-
-static bool AiDoFollowTrack(const Player* p)
-{
-	AiRailPathFindData arpfd;
-
-	arpfd.tile = p->ai.start_tile_a;
-	arpfd.tile2 = p->ai.cur_tile_a;
-	arpfd.flag = false;
-	arpfd.count = 0;
-	FollowTrack(p->ai.cur_tile_a + TileOffsByDiagDir(p->ai.cur_dir_a), 0x2000 | TRANSPORT_RAIL, p->ai.cur_dir_a^2,
-		(TPFEnumProc*)AiEnumFollowTrack, NULL, &arpfd);
-	return arpfd.count > 8;
-}
-
-typedef struct AiRailFinder {
-	TileIndex final_tile;
-	byte final_dir;
-	byte depth;
-	byte recursive_mode;
-	byte cur_best_dir;
-	byte best_dir;
-	byte cur_best_depth;
-	byte best_depth;
-	uint cur_best_dist;
-	const byte *best_ptr;
-	uint best_dist;
-	TileIndex cur_best_tile, best_tile;
-	TileIndex bridge_end_tile;
-	Player *player;
-} AiRailFinder;
-
-static const byte _ai_table_15[4][8] = {
-	{0, 0, 4, 3, 3, 1, 128 + 0, 64},
-	{1, 1, 2, 0, 4, 2, 128 + 1, 65},
-	{0, 2, 2, 3, 5, 1, 128 + 2, 66},
-	{1, 3, 5, 0, 3, 2, 128 + 3, 67}
-};
-
-static const byte _dir_table_1[] = { 3, 9, 12, 6};
-static const byte _dir_table_2[] = {12, 6,  3, 9};
-
-
-static bool AiIsTileBanned(const Player* p, TileIndex tile, byte val)
-{
-	int i;
-
-	for (i = 0; i != p->ai.banned_tile_count; i++) {
-		if (p->ai.banned_tiles[i] == tile && p->ai.banned_val[i] == val) {
-			return true;
-		}
-	}
-	return false;
-}
-
-static void AiBanTile(Player* p, TileIndex tile, byte val)
-{
-	uint i;
-
-	for (i = lengthof(p->ai.banned_tiles) - 1; i != 0; i--) {
-		p->ai.banned_tiles[i] = p->ai.banned_tiles[i - 1];
-		p->ai.banned_val[i] = p->ai.banned_val[i - 1];
-	}
-
-	p->ai.banned_tiles[0] = tile;
-	p->ai.banned_val[0] = val;
-
-	if (p->ai.banned_tile_count != lengthof(p->ai.banned_tiles)) {
-		p->ai.banned_tile_count++;
-	}
-}
-
-static void AiBuildRailRecursive(AiRailFinder *arf, TileIndex tile, int dir);
-
-static bool AiCheckRailPathBetter(AiRailFinder *arf, const byte *p)
-{
-	bool better = false;
-
-	if (arf->recursive_mode < 1) {
-		// Mode is 0. This means destination has not been found yet.
-		// If the found path is shorter than the current one, remember it.
-		if (arf->cur_best_dist < arf->best_dist) {
-			arf->best_dir = arf->cur_best_dir;
-			arf->best_dist = arf->cur_best_dist;
-			arf->best_ptr = p;
-			arf->best_tile = arf->cur_best_tile;
-			better = true;
-		}
-	} else if (arf->recursive_mode > 1) {
-		// Mode is 2.
-		if (arf->best_dist != 0 || arf->cur_best_depth < arf->best_depth) {
-			arf->best_depth = arf->cur_best_depth;
-			arf->best_dist = 0;
-			arf->best_ptr = p;
-			arf->best_tile = 0;
-			better = true;
-		}
-	}
-	arf->recursive_mode = 0;
-	arf->cur_best_dist = (uint)-1;
-	arf->cur_best_depth = 0xff;
-
-	return better;
-}
-
-static inline void AiCheckBuildRailBridgeHere(AiRailFinder *arf, TileIndex tile, const byte *p)
-{
-	Slope tileh;
-	uint z;
-	bool flag;
-
-	int dir2 = p[0] & 3;
-
-	tileh = GetTileSlope(tile, &z);
-	if (tileh == _dir_table_1[dir2] || (tileh == SLOPE_FLAT && z != 0)) {
-		TileIndex tile_new = tile;
-
-		// Allow bridges directly over bottom tiles
-		flag = z == 0;
-		for (;;) {
-			TileType type;
-
-			if ((TileIndexDiff)tile_new < -TileOffsByDiagDir(dir2)) return; // Wraping around map, no bridge possible!
-			tile_new = TILE_MASK(tile_new + TileOffsByDiagDir(dir2));
-			type = GetTileType(tile_new);
-
-			if (type == MP_CLEAR || type == MP_TREES || GetTileSlope(tile_new, NULL) != SLOPE_FLAT) {
-				if (!flag) return;
-				break;
-			}
-			if (type != MP_WATER && type != MP_RAILWAY && type != MP_STREET) return;
-			flag = true;
-		}
-
-		// Is building a (rail)bridge possible at this place (type doesn't matter)?
-		if (CmdFailed(DoCommand(tile_new, tile, 0 | arf->player->ai.railtype_to_use << 8, DC_AUTO, CMD_BUILD_BRIDGE))) {
-			return;
-		}
-		AiBuildRailRecursive(arf, tile_new, dir2);
-
-		// At the bottom depth, check if the new path is better than the old one.
-		if (arf->depth == 1) {
-			if (AiCheckRailPathBetter(arf, p)) arf->bridge_end_tile = tile_new;
-		}
-	}
-}
-
-static inline void AiCheckBuildRailTunnelHere(AiRailFinder *arf, TileIndex tile, const byte *p)
-{
-	uint z;
-
-	if (GetTileSlope(tile, &z) == _dir_table_2[p[0] & 3] && z != 0) {
-		int32 cost = DoCommand(tile, arf->player->ai.railtype_to_use, 0, DC_AUTO, CMD_BUILD_TUNNEL);
-
-		if (!CmdFailed(cost) && cost <= (arf->player->player_money>>4)) {
-			AiBuildRailRecursive(arf, _build_tunnel_endtile, p[0]&3);
-			if (arf->depth == 1) AiCheckRailPathBetter(arf, p);
-		}
-	}
-}
-
-
-static void AiBuildRailRecursive(AiRailFinder *arf, TileIndex tile, int dir)
-{
-	const byte *p;
-
-	tile = TILE_MASK(tile + TileOffsByDiagDir(dir));
-
-	// Reached destination?
-	if (tile == arf->final_tile) {
-		if (arf->final_dir != (dir^2)) {
-			if (arf->recursive_mode != 2) arf->recursive_mode = 1;
-		} else if (arf->recursive_mode != 2) {
-			arf->recursive_mode = 2;
-			arf->cur_best_depth = arf->depth;
-		} else {
-			if (arf->depth < arf->cur_best_depth) arf->cur_best_depth = arf->depth;
-		}
-		return;
-	}
-
-	// Depth too deep?
-	if (arf->depth >= 4) {
-		uint dist = DistanceMaxPlusManhattan(tile, arf->final_tile);
-
-		if (dist < arf->cur_best_dist) {
-			// Store the tile that is closest to the final position.
-			arf->cur_best_depth = arf->depth;
-			arf->cur_best_dist = dist;
-			arf->cur_best_tile = tile;
-			arf->cur_best_dir = dir;
-		}
-		return;
-	}
-
-	// Increase recursion depth
-	arf->depth++;
-
-	// Grab pointer to list of stuff that is possible to build
-	p = _ai_table_15[dir];
-
-	// Try to build a single rail in all directions.
-	if (GetTileZ(tile) == 0) {
-		p += 6;
-	} else {
-		do {
-			// Make sure the tile is not in the list of banned tiles and that a rail can be built here.
-			if (!AiIsTileBanned(arf->player, tile, p[0]) &&
-					!CmdFailed(DoCommand(tile, arf->player->ai.railtype_to_use, p[0], DC_AUTO | DC_NO_WATER | DC_NO_RAIL_OVERLAP, CMD_BUILD_SINGLE_RAIL))) {
-				AiBuildRailRecursive(arf, tile, p[1]);
-			}
-
-			// At the bottom depth?
-			if (arf->depth == 1) AiCheckRailPathBetter(arf, p);
-
-			p += 2;
-		} while (!(p[0]&0x80));
-	}
-
-	AiCheckBuildRailBridgeHere(arf, tile, p);
-	AiCheckBuildRailTunnelHere(arf, tile, p+1);
-
-	arf->depth--;
-}
-
-
-static const byte _dir_table_3[]= {0x25, 0x2A, 0x19, 0x16};
-
-static void AiBuildRailConstruct(Player *p)
-{
-	AiRailFinder arf;
-	int i;
-
-	// Check too much lookahead?
-	if (AiDoFollowTrack(p)) {
-		p->ai.state_counter = (Random()&0xE)+6; // Destruct this amount of blocks
-		p->ai.state_mode = 1; // Start destruct
-
-		// Ban this tile and don't reach it for a while.
-		AiBanTile(p, p->ai.cur_tile_a, FindFirstBit(GetRailTrackStatus(p->ai.cur_tile_a)));
-		return;
-	}
-
-	// Setup recursive finder and call it.
-	arf.player = p;
-	arf.final_tile = p->ai.cur_tile_b;
-	arf.final_dir = p->ai.cur_dir_b;
-	arf.depth = 0;
-	arf.recursive_mode = 0;
-	arf.best_ptr = NULL;
-	arf.cur_best_dist = (uint)-1;
-	arf.cur_best_depth = 0xff;
-	arf.best_dist = (uint)-1;
-	arf.best_depth = 0xff;
-	arf.cur_best_tile = 0;
-	arf.best_tile = 0;
-	AiBuildRailRecursive(&arf, p->ai.cur_tile_a, p->ai.cur_dir_a);
-
-	// Reached destination?
-	if (arf.recursive_mode == 2 && arf.cur_best_depth == 0) {
-		p->ai.state_mode = 255;
-		return;
-	}
-
-	// Didn't find anything to build?
-	if (arf.best_ptr == NULL) {
-		// Terraform some
-		for (i = 0; i != 5; i++) {
-			AiDoTerraformLand(p->ai.cur_tile_a, p->ai.cur_dir_a, 3, 0);
-		}
-
-		if (++p->ai.state_counter == 21) {
-			p->ai.state_counter = 40;
-			p->ai.state_mode = 1;
-
-			// Ban this tile
-			AiBanTile(p, p->ai.cur_tile_a, FindFirstBit(GetRailTrackStatus(p->ai.cur_tile_a)));
-		}
-		return;
-	}
-
-	p->ai.cur_tile_a += TileOffsByDiagDir(p->ai.cur_dir_a);
-
-	if (arf.best_ptr[0] & 0x80) {
-		int i;
-		int32 bridge_len = GetBridgeLength(arf.bridge_end_tile, p->ai.cur_tile_a);
-
-		/* Figure out which (rail)bridge type to build
-		 * start with best bridge, then go down to worse and worse bridges
-		 * unnecessary to check for worst bridge (i=0), since AI will always build
-		 * that. AI is so fucked up that fixing this small thing will probably not
-		 * solve a thing
-		 */
-		for (i = MAX_BRIDGES - 1; i != 0; i--) {
-			if (CheckBridge_Stuff(i, bridge_len)) {
-				int32 cost = DoCommand(arf.bridge_end_tile, p->ai.cur_tile_a, i | (p->ai.railtype_to_use << 8), DC_AUTO, CMD_BUILD_BRIDGE);
-				if (!CmdFailed(cost) && cost < (p->player_money >> 5)) break;
-			}
-		}
-
-		// Build it
-		DoCommand(arf.bridge_end_tile, p->ai.cur_tile_a, i | (p->ai.railtype_to_use << 8), DC_AUTO | DC_EXEC, CMD_BUILD_BRIDGE);
-
-		p->ai.cur_tile_a = arf.bridge_end_tile;
-		p->ai.state_counter = 0;
-	} else if (arf.best_ptr[0] & 0x40) {
-		// tunnel
-		DoCommand(p->ai.cur_tile_a, p->ai.railtype_to_use, 0, DC_AUTO | DC_EXEC, CMD_BUILD_TUNNEL);
-		p->ai.cur_tile_a = _build_tunnel_endtile;
-		p->ai.state_counter = 0;
-	} else {
-		// rail
-		p->ai.cur_dir_a = arf.best_ptr[1];
-		DoCommand(p->ai.cur_tile_a, p->ai.railtype_to_use, arf.best_ptr[0],
-			DC_EXEC | DC_AUTO | DC_NO_WATER | DC_NO_RAIL_OVERLAP, CMD_BUILD_SINGLE_RAIL);
-		p->ai.state_counter = 0;
-	}
-
-	if (arf.best_tile != 0) {
-		for (i = 0; i != 2; i++) {
-			AiDoTerraformLand(arf.best_tile, arf.best_dir, 3, 0);
-		}
-	}
-}
-
-static bool AiRemoveTileAndGoForward(Player *p)
-{
-	byte b;
-	int bit;
-	const byte *ptr;
-	TileIndex tile = p->ai.cur_tile_a;
-	TileIndex tilenew;
-
-	if (IsTileType(tile, MP_TUNNELBRIDGE)) {
-		if (IsTunnel(tile)) {
-			// Clear the tunnel and continue at the other side of it.
-			if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR)))
-				return false;
-			p->ai.cur_tile_a = TILE_MASK(_build_tunnel_endtile - TileOffsByDiagDir(p->ai.cur_dir_a));
-			return true;
-		} else {
-			// Check if the bridge points in the right direction.
-			// This is not really needed the first place AiRemoveTileAndGoForward is called.
-			if (DiagDirToAxis(GetBridgeRampDirection(tile)) != (p->ai.cur_dir_a & 1U)) return false;
-
-			tile = GetOtherBridgeEnd(tile);
-
-			tilenew = TILE_MASK(tile - TileOffsByDiagDir(p->ai.cur_dir_a));
-			// And clear the bridge.
-			if (CmdFailed(DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR)))
-				return false;
-			p->ai.cur_tile_a = tilenew;
-			return true;
-		}
-	}
-
-	// Find the railtype at the position. Quit if no rail there.
-	b = GetRailTrackStatus(tile) & _dir_table_3[p->ai.cur_dir_a];
-	if (b == 0) return false;
-
-	// Convert into a bit position that CMD_REMOVE_SINGLE_RAIL expects.
-	bit = FindFirstBit(b);
-
-	// Then remove and signals if there are any.
-	if (IsTileType(tile, MP_RAILWAY) &&
-			GetRailTileType(tile) == RAIL_TILE_SIGNALS) {
-		DoCommand(tile, 0, 0, DC_EXEC, CMD_REMOVE_SIGNALS);
-	}
-
-	// And also remove the rail.
-	if (CmdFailed(DoCommand(tile, 0, bit, DC_EXEC, CMD_REMOVE_SINGLE_RAIL)))
-		return false;
-
-	// Find the direction at the other edge of the rail.
-	ptr = _ai_table_15[p->ai.cur_dir_a ^ 2];
-	while (ptr[0] != bit) ptr += 2;
-	p->ai.cur_dir_a = ptr[1] ^ 2;
-
-	// And then also switch tile.
-	p->ai.cur_tile_a = TILE_MASK(p->ai.cur_tile_a - TileOffsByDiagDir(p->ai.cur_dir_a));
-
-	return true;
-}
-
-
-static void AiBuildRailDestruct(Player *p)
-{
-	// Decrease timeout.
-	if (!--p->ai.state_counter) {
-		p->ai.state_mode = 2;
-		p->ai.state_counter = 0;
-	}
-
-	// Don't do anything if the destination is already reached.
-	if (p->ai.cur_tile_a == p->ai.start_tile_a) return;
-
-	AiRemoveTileAndGoForward(p);
-}
-
-
-static void AiBuildRail(Player *p)
-{
-	switch (p->ai.state_mode) {
-		case 0: // Construct mode, build new rail.
-			AiBuildRailConstruct(p);
-			break;
-
-		case 1: // Destruct mode, destroy the rail currently built.
-			AiBuildRailDestruct(p);
-			break;
-
-		case 2: {
-			uint i;
-
-			// Terraform some and then try building again.
-			for (i = 0; i != 4; i++) {
-				AiDoTerraformLand(p->ai.cur_tile_a, p->ai.cur_dir_a, 3, 0);
-			}
-
-			if (++p->ai.state_counter == 4) {
-				p->ai.state_counter = 0;
-				p->ai.state_mode = 0;
-			}
-		}
-
-		default: break;
-	}
-}
-
-static void AiStateBuildRail(Player *p)
-{
-	int num;
-	AiBuildRec *aib;
-	byte cmd;
-	TileIndex tile;
-	int dir;
-
-	// time out?
-	if (++p->ai.timeout_counter == 1388) {
-		p->ai.state = AIS_DELETE_RAIL_BLOCKS;
-		return;
-	}
-
-	// Currently building a rail between two points?
-	if (p->ai.state_mode != 255) {
-		AiBuildRail(p);
-
-		// Alternate between edges
-		swap_tile(&p->ai.start_tile_a, &p->ai.start_tile_b);
-		swap_tile(&p->ai.cur_tile_a, &p->ai.cur_tile_b);
-		swap_byte(&p->ai.start_dir_a, &p->ai.start_dir_b);
-		swap_byte(&p->ai.cur_dir_a, &p->ai.cur_dir_b);
-		return;
-	}
-
-	// Now, find two new points to build between
-	num = p->ai.num_build_rec;
-	aib = &p->ai.src;
-
-	for (;;) {
-		cmd = aib->buildcmd_a;
-		aib->buildcmd_a = 255;
-		if (cmd != 255) break;
-
-		cmd = aib->buildcmd_b;
-		aib->buildcmd_b = 255;
-		if (cmd != 255) break;
-
-		aib++;
-		if (--num == 0) {
-			p->ai.state = AIS_BUILD_RAIL_VEH;
-			p->ai.state_counter = 0; // timeout
-			return;
-		}
-	}
-
-	// Find first edge to build from.
-	tile = AiGetEdgeOfDefaultRailBlock(aib->cur_building_rule, aib->use_tile, cmd&3, &dir);
-	p->ai.start_tile_a = tile;
-	p->ai.cur_tile_a = tile;
-	p->ai.start_dir_a = dir;
-	p->ai.cur_dir_a = dir;
-	DoCommand(TILE_MASK(tile + TileOffsByDiagDir(dir)), 0, (dir&1)?1:0, DC_EXEC, CMD_REMOVE_SINGLE_RAIL);
-
-	assert(TILE_MASK(tile) != 0xFF00);
-
-	// Find second edge to build to
-	aib = (&p->ai.src) + ((cmd >> 4)&0xF);
-	tile = AiGetEdgeOfDefaultRailBlock(aib->cur_building_rule, aib->use_tile, (cmd>>2)&3, &dir);
-	p->ai.start_tile_b = tile;
-	p->ai.cur_tile_b = tile;
-	p->ai.start_dir_b = dir;
-	p->ai.cur_dir_b = dir;
-	DoCommand(TILE_MASK(tile + TileOffsByDiagDir(dir)), 0, (dir&1)?1:0, DC_EXEC, CMD_REMOVE_SINGLE_RAIL);
-
-	assert(TILE_MASK(tile) != 0xFF00);
-
-	// And setup state.
-	p->ai.state_mode = 2;
-	p->ai.state_counter = 0;
-	p->ai.banned_tile_count = 0;
-}
-
-static StationID AiGetStationIdByDef(TileIndex tile, int id)
-{
-	const AiDefaultBlockData *p = _default_rail_track_data[id]->data;
-	while (p->mode != 1) p++;
-	return GetStationIndex(TILE_ADD(tile, ToTileIndexDiff(p->tileoffs)));
-}
-
-static EngineID AiFindBestWagon(CargoID cargo, RailType railtype)
-{
-	EngineID best_veh_index = INVALID_ENGINE;
-	EngineID i;
-	uint16 best_capacity = 0;
-	uint16 best_speed    = 0;
-	uint speed;
-
-	for (i = 0; i < NUM_TRAIN_ENGINES; i++) {
-		const RailVehicleInfo *rvi = RailVehInfo(i);
-		const Engine* e = GetEngine(i);
-
-		if (!IsCompatibleRail(e->railtype, railtype) ||
-				!(rvi->flags & RVI_WAGON) ||
-				!HASBIT(e->player_avail, _current_player)) {
-			continue;
-		}
-
-		if (rvi->cargo_type != cargo) continue;
-
-		/* max_speed of 0 indicates no speed limit */
-		speed = rvi->max_speed == 0 ? 0xFFFF : rvi->max_speed;
-
-		if (rvi->capacity >= best_capacity && speed >= best_speed) {
-			best_capacity = rvi->capacity;
-			best_speed    = best_speed;
-			best_veh_index = i;
-		}
-	}
-
-	return best_veh_index;
-}
-
-static void AiStateBuildRailVeh(Player *p)
-{
-	const AiDefaultBlockData *ptr;
-	TileIndex tile;
-	EngineID veh;
-	int i;
-	CargoID cargo;
-	int32 cost;
-	Vehicle *v;
-	VehicleID loco_id;
-
-	ptr = _default_rail_track_data[p->ai.src.cur_building_rule]->data;
-	while (ptr->mode != 0) ptr++;
-
-	tile = TILE_ADD(p->ai.src.use_tile, ToTileIndexDiff(ptr->tileoffs));
-
-
-	cargo = p->ai.cargo_type;
-	for (i = 0;;) {
-		if (p->ai.wagon_list[i] == INVALID_VEHICLE) {
-			veh = AiFindBestWagon(cargo, p->ai.railtype_to_use);
-			/* veh will return INVALID_ENGINE if no suitable wagon is available.
-			 * We shall treat this in the same way as having no money */
-			if (veh == INVALID_ENGINE) goto handle_nocash;
-			cost = DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE);
-			if (CmdFailed(cost)) goto handle_nocash;
-			p->ai.wagon_list[i] = _new_vehicle_id;
-			p->ai.wagon_list[i + 1] = INVALID_VEHICLE;
-			return;
-		}
-		if (cargo == CT_MAIL) cargo = CT_PASSENGERS;
-		if (++i == p->ai.num_wagons * 2 - 1) break;
-	}
-
-	// Which locomotive to build?
-	veh = AiChooseTrainToBuild(p->ai.railtype_to_use, p->player_money, cargo != CT_PASSENGERS ? 1 : 0, tile);
-	if (veh == INVALID_ENGINE) {
-handle_nocash:
-		// after a while, if AI still doesn't have cash, get out of this block by selling the wagons.
-		if (++p->ai.state_counter == 1000) {
-			for (i = 0; p->ai.wagon_list[i] != INVALID_VEHICLE; i++) {
-				cost = DoCommand(tile, p->ai.wagon_list[i], 0, DC_EXEC, CMD_SELL_RAIL_WAGON);
-				assert(!CmdFailed(cost));
-			}
-			p->ai.state = AIS_0;
-		}
-		return;
-	}
-
-	// Try to build the locomotive
-	cost = DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_RAIL_VEHICLE);
-	assert(!CmdFailed(cost));
-	loco_id = _new_vehicle_id;
-
-	// Sell a vehicle if the train is double headed.
-	v = GetVehicle(loco_id);
-	if (v->next != NULL) {
-		i = p->ai.wagon_list[p->ai.num_wagons * 2 - 2];
-		p->ai.wagon_list[p->ai.num_wagons * 2 - 2] = INVALID_VEHICLE;
-		DoCommand(tile, i, 0, DC_EXEC, CMD_SELL_RAIL_WAGON);
-	}
-
-	// Move the wagons onto the train
-	for (i = 0; p->ai.wagon_list[i] != INVALID_VEHICLE; i++) {
-		DoCommand(tile, p->ai.wagon_list[i] | (loco_id << 16), 0, DC_EXEC, CMD_MOVE_RAIL_VEHICLE);
-	}
-
-	for (i = 0; p->ai.order_list_blocks[i] != 0xFF; i++) {
-		const AiBuildRec* aib = &p->ai.src + p->ai.order_list_blocks[i];
-		bool is_pass = (
-			p->ai.cargo_type == CT_PASSENGERS ||
-			p->ai.cargo_type == CT_MAIL ||
-			(_opt.landscape == LT_NORMAL && p->ai.cargo_type == CT_VALUABLES)
-		);
-		Order order;
-
-		order.type = OT_GOTO_STATION;
-		order.flags = 0;
-		order.dest = AiGetStationIdByDef(aib->use_tile, aib->cur_building_rule);
-
-		if (!is_pass && i == 1) order.flags |= OF_UNLOAD;
-		if (p->ai.num_want_fullload != 0 && (is_pass || i == 0))
-			order.flags |= OF_FULL_LOAD;
-
-		DoCommand(0, loco_id + (i << 16), PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
-	}
-
-	DoCommand(0, loco_id, 0, DC_EXEC, CMD_START_STOP_TRAIN);
-
-	DoCommand(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
-
-	if (p->ai.num_want_fullload != 0) p->ai.num_want_fullload--;
-
-	if (--p->ai.num_loco_to_build != 0) {
-//		p->ai.loco_id = INVALID_VEHICLE;
-		p->ai.wagon_list[0] = INVALID_VEHICLE;
-	} else {
-		p->ai.state = AIS_0;
-	}
-}
-
-static void AiStateDeleteRailBlocks(Player *p)
-{
-	const AiBuildRec* aib = &p->ai.src;
-	uint num = p->ai.num_build_rec;
-
-	do {
-		const AiDefaultBlockData* b;
-
-		if (aib->cur_building_rule == 255) continue;
-		for (b = _default_rail_track_data[aib->cur_building_rule]->data; b->mode != 4; b++) {
-			DoCommand(TILE_ADD(aib->use_tile, ToTileIndexDiff(b->tileoffs)), 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
-		}
-	} while (++aib,--num);
-
-	p->ai.state = AIS_0;
-}
-
-static bool AiCheckRoadResources(TileIndex tile, const AiDefaultBlockData *p, byte cargo)
-{
-	uint values[NUM_CARGO];
-	int rad;
-
-	if (_patches.modified_catchment) {
-		rad = CA_TRUCK; // Same as CA_BUS at the moment?
-	} else { // change that at some point?
-		rad = 4;
-	}
-
-	for (;; p++) {
-		if (p->mode == 4) {
-			return true;
-		} else if (p->mode == 1) {
-			TileIndex tile2 = TILE_ADD(tile, ToTileIndexDiff(p->tileoffs));
-
-			if (cargo & 0x80) {
-				GetProductionAroundTiles(values, tile2, 1, 1, rad);
-				return values[cargo & 0x7F] != 0;
-			} else {
-				GetAcceptanceAroundTiles(values, tile2, 1, 1, rad);
-				return (values[cargo]&~7) != 0;
-			}
-		}
-	}
-}
-
-static bool _want_road_truck_station;
-static int32 AiDoBuildDefaultRoadBlock(TileIndex tile, const AiDefaultBlockData *p, byte flag);
-
-// Returns rule and cost
-static int AiFindBestDefaultRoadBlock(TileIndex tile, byte direction, byte cargo, int32 *cost)
-{
-	int i;
-	const AiDefaultRoadBlock *p;
-
-	_want_road_truck_station = (cargo & 0x7F) != CT_PASSENGERS;
-
-	for (i = 0; (p = _road_default_block_data[i]) != NULL; i++) {
-		if (p->dir == direction) {
-			*cost = AiDoBuildDefaultRoadBlock(tile, p->data, 0);
-			if (!CmdFailed(*cost) && AiCheckRoadResources(tile, p->data, cargo))
-				return i;
-		}
-	}
-
-	return -1;
-}
-
-static int32 AiDoBuildDefaultRoadBlock(TileIndex tile, const AiDefaultBlockData *p, byte flag)
-{
-	int32 ret;
-	int32 total_cost = 0;
-	Town *t = NULL;
-	int rating = 0;
-	int roadflag = 0;
-
-	for (;p->mode != 4;p++) {
-		TileIndex c = TILE_MASK(tile + ToTileIndexDiff(p->tileoffs));
-
-		_cleared_town = NULL;
-
-		if (p->mode == 2) {
-			if (IsTileType(c, MP_STREET) &&
-					GetRoadTileType(c) == ROAD_TILE_NORMAL &&
-					(GetRoadBits(c) & p->attr) != 0) {
-				roadflag |= 2;
-
-				// all bits are already built?
-				if ((GetRoadBits(c) & p->attr) == p->attr) continue;
-			}
-
-			ret = DoCommand(c, p->attr, 0, flag | DC_AUTO | DC_NO_WATER, CMD_BUILD_ROAD);
-			if (CmdFailed(ret)) return CMD_ERROR;
-			total_cost += ret;
-
-			continue;
-		}
-
-		if (p->mode == 0) {
-			// Depot
-			ret = DoCommand(c, p->attr, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_DEPOT);
-			goto clear_town_stuff;
-		} else if (p->mode == 1) {
-			if (_want_road_truck_station) {
-				// Truck station
-				ret = DoCommand(c, p->attr, RS_TRUCK, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_STOP);
-			} else {
-				// Bus station
-				ret = DoCommand(c, p->attr, RS_BUS, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_BUILD_ROAD_STOP);
-			}
-clear_town_stuff:;
-
-			if (CmdFailed(ret)) return CMD_ERROR;
-			total_cost += ret;
-
-			if (_cleared_town != NULL) {
-				if (t != NULL && t != _cleared_town) return CMD_ERROR;
-				t = _cleared_town;
-				rating += _cleared_town_rating;
-			}
-		} else if (p->mode == 3) {
-			if (flag & DC_EXEC) continue;
-
-			if (GetTileSlope(c, NULL) != SLOPE_FLAT) return CMD_ERROR;
-
-			if (!IsTileType(c, MP_STREET) || GetRoadTileType(c) != ROAD_TILE_NORMAL) {
-				ret = DoCommand(c, 0, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_LANDSCAPE_CLEAR);
-				if (CmdFailed(ret)) return CMD_ERROR;
-			}
-
-		}
-	}
-
-	if (!_want_road_truck_station && !(roadflag & 2)) return CMD_ERROR;
-
-	if (!(flag & DC_EXEC)) {
-		if (t != NULL && rating > t->ratings[_current_player]) return CMD_ERROR;
-	}
-	return total_cost;
-}
-
-// Make sure the blocks are not too close to each other
-static bool AiCheckBlockDistances(Player *p, TileIndex tile)
-{
-	const AiBuildRec* aib = &p->ai.src;
-	uint num = p->ai.num_build_rec;
-
-	do {
-		if (aib->cur_building_rule != 255) {
-			if (DistanceManhattan(aib->use_tile, tile) < 9) return false;
-		}
-	} while (++aib, --num);
-
-	return true;
-}
-
-
-static void AiStateBuildDefaultRoadBlocks(Player *p)
-{
-	uint i;
-	int j;
-	AiBuildRec *aib;
-	int rule;
-	int32 cost;
-
-	// time out?
-	if (++p->ai.timeout_counter == 1388) {
-		p->ai.state = AIS_DELETE_RAIL_BLOCKS;
-		return;
-	}
-
-	// do the following 8 times
-	for (i = 0; i != 8; i++) {
-		// check if we can build the default track
-		aib = &p->ai.src;
-		j = p->ai.num_build_rec;
-		do {
-			// this item has already been built?
-			if (aib->cur_building_rule != 255) continue;
-
-			// adjust the coordinate randomly,
-			// to make sure that we find a position.
-			aib->use_tile = AdjustTileCoordRandomly(aib->spec_tile, aib->rand_rng);
-
-			// check if the road can be built there.
-			rule = AiFindBestDefaultRoadBlock(
-				aib->use_tile, aib->direction, aib->cargo, &cost
-			);
-
-			if (rule == -1) {
-				// cannot build, terraform after a while
-				if (p->ai.state_counter >= 600) {
-					AiDoTerraformLand(aib->use_tile, Random()&3, 3, (int8)p->ai.state_mode);
-				}
-				// also try the other terraform direction
-				if (++p->ai.state_counter >= 1000) {
-					p->ai.state_counter = 0;
-					p->ai.state_mode = -p->ai.state_mode;
-				}
-			} else if (CheckPlayerHasMoney(cost) && AiCheckBlockDistances(p,aib->use_tile)) {
-				int32 r;
-
-				// player has money, build it.
-				aib->cur_building_rule = rule;
-
-				r = AiDoBuildDefaultRoadBlock(
-					aib->use_tile,
-					_road_default_block_data[rule]->data,
-					DC_EXEC | DC_NO_TOWN_RATING
-				);
-				assert(!CmdFailed(r));
-			}
-		} while (++aib,--j);
-	}
-
-	// check if we're done with all of them
-	aib = &p->ai.src;
-	j = p->ai.num_build_rec;
-	do {
-		if (aib->cur_building_rule == 255) return;
-	} while (++aib,--j);
-
-	// yep, all are done. switch state to the rail building state.
-	p->ai.state = AIS_BUILD_ROAD;
-	p->ai.state_mode = 255;
-}
-
-typedef struct {
-	TileIndex final_tile;
-	byte final_dir;
-	byte depth;
-	byte recursive_mode;
-	byte cur_best_dir;
-	byte best_dir;
-	byte cur_best_depth;
-	byte best_depth;
-	uint cur_best_dist;
-	const byte *best_ptr;
-	uint best_dist;
-	TileIndex cur_best_tile, best_tile;
-	TileIndex bridge_end_tile;
-	Player *player;
-} AiRoadFinder;
-
-typedef struct AiRoadEnum {
-	TileIndex dest;
-	TileIndex best_tile;
-	int best_track;
-	uint best_dist;
-} AiRoadEnum;
-
-static const byte _dir_by_track[] = {
-	0, 1, 0, 1, 2, 1,
-	0, 0,
-	2, 3, 3, 2, 3, 0,
-};
-
-static void AiBuildRoadRecursive(AiRoadFinder *arf, TileIndex tile, int dir);
-
-static bool AiCheckRoadPathBetter(AiRoadFinder *arf, const byte *p)
-{
-	bool better = false;
-
-	if (arf->recursive_mode < 1) {
-		// Mode is 0. This means destination has not been found yet.
-		// If the found path is shorter than the current one, remember it.
-		if (arf->cur_best_dist < arf->best_dist ||
-			(arf->cur_best_dist == arf->best_dist && arf->cur_best_depth < arf->best_depth)) {
-			arf->best_depth = arf->cur_best_depth;
-			arf->best_dist = arf->cur_best_dist;
-			arf->best_dir = arf->cur_best_dir;
-			arf->best_ptr = p;
-			arf->best_tile = arf->cur_best_tile;
-			better = true;
-		}
-	} else if (arf->recursive_mode > 1) {
-		// Mode is 2.
-		if (arf->best_dist != 0 || arf->cur_best_depth < arf->best_depth) {
-			arf->best_depth = arf->cur_best_depth;
-			arf->best_dist = 0;
-			arf->best_ptr = p;
-			arf->best_tile = 0;
-			better = true;
-		}
-	}
-	arf->recursive_mode = 0;
-	arf->cur_best_dist = (uint)-1;
-	arf->cur_best_depth = 0xff;
-
-	return better;
-}
-
-
-static bool AiEnumFollowRoad(TileIndex tile, AiRoadEnum *a, int track, uint length, byte *state)
-{
-	uint dist = DistanceManhattan(tile, a->dest);
-
-	if (dist <= a->best_dist) {
-		TileIndex tile2 = TILE_MASK(tile + TileOffsByDiagDir(_dir_by_track[track]));
-
-		if (IsTileType(tile2, MP_STREET) && GetRoadTileType(tile2) == ROAD_TILE_NORMAL) {
-			a->best_dist = dist;
-			a->best_tile = tile;
-			a->best_track = track;
-		}
-	}
-
-	return false;
-}
-
-static const uint16 _ai_road_table_and[4] = {
-	0x1009,
-	0x16,
-	0x520,
-	0x2A00,
-};
-
-static bool AiCheckRoadFinished(Player *p)
-{
-	AiRoadEnum are;
-	TileIndex tile;
-	int dir = p->ai.cur_dir_a;
-	uint32 bits;
-	int i;
-
-	are.dest = p->ai.cur_tile_b;
-	tile = TILE_MASK(p->ai.cur_tile_a + TileOffsByDiagDir(dir));
-
-	if (IsRoadStopTile(tile) || IsTileDepotType(tile, TRANSPORT_ROAD)) return false;
-	bits = GetTileTrackStatus(tile, TRANSPORT_ROAD) & _ai_road_table_and[dir];
-	if (bits == 0) return false;
-
-	are.best_dist = (uint)-1;
-
-	for_each_bit(i, bits) {
-		FollowTrack(tile, 0x3000 | TRANSPORT_ROAD, _dir_by_track[i], (TPFEnumProc*)AiEnumFollowRoad, NULL, &are);
-	}
-
-	if (DistanceManhattan(tile, are.dest) <= are.best_dist) return false;
-
-	if (are.best_dist == 0) return true;
-
-	p->ai.cur_tile_a = are.best_tile;
-	p->ai.cur_dir_a = _dir_by_track[are.best_track];
-	return false;
-}
-
-
-static bool AiBuildRoadHelper(TileIndex tile, int flags, int type)
-{
-	static const RoadBits _road_bits[] = {
-		ROAD_X,
-		ROAD_Y,
-		ROAD_NW | ROAD_NE,
-		ROAD_SW | ROAD_SE,
-		ROAD_NW | ROAD_SW,
-		ROAD_SE | ROAD_NE
-	};
-	return !CmdFailed(DoCommand(tile, _road_bits[type], 0, flags, CMD_BUILD_ROAD));
-}
-
-static inline void AiCheckBuildRoadBridgeHere(AiRoadFinder *arf, TileIndex tile, const byte *p)
-{
-	Slope tileh;
-	uint z;
-	bool flag;
-
-	int dir2 = p[0] & 3;
-
-	tileh = GetTileSlope(tile, &z);
-	if (tileh == _dir_table_1[dir2] || (tileh == SLOPE_FLAT && z != 0)) {
-		TileIndex tile_new = tile;
-
-		// Allow bridges directly over bottom tiles
-		flag = z == 0;
-		for (;;) {
-			TileType type;
-
-			if ((TileIndexDiff)tile_new < -TileOffsByDiagDir(dir2)) return; // Wraping around map, no bridge possible!
-			tile_new = TILE_MASK(tile_new + TileOffsByDiagDir(dir2));
-			type = GetTileType(tile_new);
-
-			if (type == MP_CLEAR || type == MP_TREES || GetTileSlope(tile, NULL) != SLOPE_FLAT) {
-				// Allow a bridge if either we have a tile that's water, rail or street,
-				// or if we found an up tile.
-				if (!flag) return;
-				break;
-			}
-			if (type != MP_WATER && type != MP_RAILWAY && type != MP_STREET) return;
-			flag = true;
-		}
-
-		// Is building a (rail)bridge possible at this place (type doesn't matter)?
-		if (CmdFailed(DoCommand(tile_new, tile, 0x8000, DC_AUTO, CMD_BUILD_BRIDGE)))
-			return;
-		AiBuildRoadRecursive(arf, tile_new, dir2);
-
-		// At the bottom depth, check if the new path is better than the old one.
-		if (arf->depth == 1) {
-			if (AiCheckRoadPathBetter(arf, p)) arf->bridge_end_tile = tile_new;
-		}
-	}
-}
-
-static inline void AiCheckBuildRoadTunnelHere(AiRoadFinder *arf, TileIndex tile, const byte *p)
-{
-	uint z;
-
-	if (GetTileSlope(tile, &z) == _dir_table_2[p[0] & 3] && z != 0) {
-		int32 cost = DoCommand(tile, 0x200, 0, DC_AUTO, CMD_BUILD_TUNNEL);
-
-		if (!CmdFailed(cost) && cost <= (arf->player->player_money>>4)) {
-			AiBuildRoadRecursive(arf, _build_tunnel_endtile, p[0]&3);
-			if (arf->depth == 1)  AiCheckRoadPathBetter(arf, p);
-		}
-	}
-}
-
-
-
-static void AiBuildRoadRecursive(AiRoadFinder *arf, TileIndex tile, int dir)
-{
-	const byte *p;
-
-	tile = TILE_MASK(tile + TileOffsByDiagDir(dir));
-
-	// Reached destination?
-	if (tile == arf->final_tile) {
-		if ((arf->final_dir^2) == dir) {
-			arf->recursive_mode = 2;
-			arf->cur_best_depth = arf->depth;
-		}
-		return;
-	}
-
-	// Depth too deep?
-	if (arf->depth >= 4) {
-		uint dist = DistanceMaxPlusManhattan(tile, arf->final_tile);
-		if (dist < arf->cur_best_dist) {
-			// Store the tile that is closest to the final position.
-			arf->cur_best_dist = dist;
-			arf->cur_best_tile = tile;
-			arf->cur_best_dir = dir;
-			arf->cur_best_depth = arf->depth;
-		}
-		return;
-	}
-
-	// Increase recursion depth
-	arf->depth++;
-
-	// Grab pointer to list of stuff that is possible to build
-	p = _ai_table_15[dir];
-
-	// Try to build a single rail in all directions.
-	if (GetTileZ(tile) == 0) {
-		p += 6;
-	} else {
-		do {
-			// Make sure that a road can be built here.
-			if (AiBuildRoadHelper(tile, DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, p[0])) {
-				AiBuildRoadRecursive(arf, tile, p[1]);
-			}
-
-			// At the bottom depth?
-			if (arf->depth == 1) AiCheckRoadPathBetter(arf, p);
-
-			p += 2;
-		} while (!(p[0] & 0x80));
-	}
-
-	AiCheckBuildRoadBridgeHere(arf, tile, p);
-	AiCheckBuildRoadTunnelHere(arf, tile, p+1);
-
-	arf->depth--;
-}
-
-
-static void AiBuildRoadConstruct(Player *p)
-{
-	AiRoadFinder arf;
-	int i;
-	TileIndex tile;
-
-	// Reached destination?
-	if (AiCheckRoadFinished(p)) {
-		p->ai.state_mode = 255;
-		return;
-	}
-
-	// Setup recursive finder and call it.
-	arf.player = p;
-	arf.final_tile = p->ai.cur_tile_b;
-	arf.final_dir = p->ai.cur_dir_b;
-	arf.depth = 0;
-	arf.recursive_mode = 0;
-	arf.best_ptr = NULL;
-	arf.cur_best_dist = (uint)-1;
-	arf.cur_best_depth = 0xff;
-	arf.best_dist = (uint)-1;
-	arf.best_depth =  0xff;
-	arf.cur_best_tile = 0;
-	arf.best_tile = 0;
-	AiBuildRoadRecursive(&arf, p->ai.cur_tile_a, p->ai.cur_dir_a);
-
-	// Reached destination?
-	if (arf.recursive_mode == 2 && arf.cur_best_depth == 0) {
-		p->ai.state_mode = 255;
-		return;
-	}
-
-	// Didn't find anything to build?
-	if (arf.best_ptr == NULL) {
-		// Terraform some
-do_some_terraform:
-		for (i = 0; i != 5; i++)
-			AiDoTerraformLand(p->ai.cur_tile_a, p->ai.cur_dir_a, 3, 0);
-
-		if (++p->ai.state_counter == 21) {
-			p->ai.state_mode = 1;
-
-			p->ai.cur_tile_a = TILE_MASK(p->ai.cur_tile_a + TileOffsByDiagDir(p->ai.cur_dir_a));
-			p->ai.cur_dir_a ^= 2;
-			p->ai.state_counter = 0;
-		}
-		return;
-	}
-
-	tile = TILE_MASK(p->ai.cur_tile_a + TileOffsByDiagDir(p->ai.cur_dir_a));
-
-	if (arf.best_ptr[0]&0x80) {
-		int i;
-		int32 bridge_len;
-		p->ai.cur_tile_a = arf.bridge_end_tile;
-		bridge_len = GetBridgeLength(tile, p->ai.cur_tile_a); // tile
-
-		/* Figure out what (road)bridge type to build
-		 * start with best bridge, then go down to worse and worse bridges
-		 * unnecessary to check for worse bridge (i=0), since AI will always build that.
-		 *AI is so fucked up that fixing this small thing will probably not solve a thing
-		 */
-		for (i = 10; i != 0; i--) {
-			if (CheckBridge_Stuff(i, bridge_len)) {
-				int32 cost = DoCommand(tile, p->ai.cur_tile_a, i + (0x80 << 8), DC_AUTO, CMD_BUILD_BRIDGE);
-				if (!CmdFailed(cost) && cost < (p->player_money >> 5)) break;
-			}
-		}
-
-		// Build it
-		DoCommand(tile, p->ai.cur_tile_a, i + (0x80 << 8), DC_AUTO | DC_EXEC, CMD_BUILD_BRIDGE);
-
-		p->ai.state_counter = 0;
-	} else if (arf.best_ptr[0]&0x40) {
-		// tunnel
-		DoCommand(tile, 0x200, 0, DC_AUTO | DC_EXEC, CMD_BUILD_TUNNEL);
-		p->ai.cur_tile_a = _build_tunnel_endtile;
-		p->ai.state_counter = 0;
-	} else {
-		// road
-		if (!AiBuildRoadHelper(tile, DC_EXEC | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, arf.best_ptr[0]))
-			goto do_some_terraform;
-
-		p->ai.cur_dir_a = arf.best_ptr[1];
-		p->ai.cur_tile_a = tile;
-		p->ai.state_counter = 0;
-	}
-
-	if (arf.best_tile != 0) {
-		for (i = 0; i != 2; i++)
-			AiDoTerraformLand(arf.best_tile, arf.best_dir, 3, 0);
-	}
-}
-
-
-static void AiBuildRoad(Player *p)
-{
-	if (p->ai.state_mode < 1) {
-		// Construct mode, build new road.
-		AiBuildRoadConstruct(p);
-	} else if (p->ai.state_mode == 1) {
-		// Destruct mode, not implemented for roads.
-		p->ai.state_mode = 2;
-		p->ai.state_counter = 0;
-	} else if (p->ai.state_mode == 2) {
-		uint i;
-
-		// Terraform some and then try building again.
-		for (i = 0; i != 4; i++) {
-			AiDoTerraformLand(p->ai.cur_tile_a, p->ai.cur_dir_a, 3, 0);
-		}
-
-		if (++p->ai.state_counter == 4) {
-			p->ai.state_counter = 0;
-			p->ai.state_mode = 0;
-		}
-	}
-}
-
-static TileIndex AiGetRoadBlockEdge(byte rule, TileIndex tile, int *dir)
-{
-	const AiDefaultBlockData *p = _road_default_block_data[rule]->data;
-	while (p->mode != 1) p++;
-	*dir = p->attr;
-	return TILE_ADD(tile, ToTileIndexDiff(p->tileoffs));
-}
-
-
-static void AiStateBuildRoad(Player *p)
-{
-	int num;
-	AiBuildRec *aib;
-	byte cmd;
-	TileIndex tile;
-	int dir;
-
-	// time out?
-	if (++p->ai.timeout_counter == 1388) {
-		p->ai.state = AIS_DELETE_ROAD_BLOCKS;
-		return;
-	}
-
-	// Currently building a road between two points?
-	if (p->ai.state_mode != 255) {
-		AiBuildRoad(p);
-
-		// Alternate between edges
-		swap_tile(&p->ai.start_tile_a, &p->ai.start_tile_b);
-		swap_tile(&p->ai.cur_tile_a, &p->ai.cur_tile_b);
-		swap_byte(&p->ai.start_dir_a, &p->ai.start_dir_b);
-		swap_byte(&p->ai.cur_dir_a, &p->ai.cur_dir_b);
-
-		return;
-	}
-
-	// Now, find two new points to build between
-	num = p->ai.num_build_rec;
-	aib = &p->ai.src;
-
-	for (;;) {
-		cmd = aib->buildcmd_a;
-		aib->buildcmd_a = 255;
-		if (cmd != 255) break;
-
-		aib++;
-		if (--num == 0) {
-			p->ai.state = AIS_BUILD_ROAD_VEHICLES;
-			return;
-		}
-	}
-
-	// Find first edge to build from.
-	tile = AiGetRoadBlockEdge(aib->cur_building_rule, aib->use_tile, &dir);
-	p->ai.start_tile_a = tile;
-	p->ai.cur_tile_a = tile;
-	p->ai.start_dir_a = dir;
-	p->ai.cur_dir_a = dir;
-
-	// Find second edge to build to
-	aib = (&p->ai.src) + (cmd&0xF);
-	tile = AiGetRoadBlockEdge(aib->cur_building_rule, aib->use_tile, &dir);
-	p->ai.start_tile_b = tile;
-	p->ai.cur_tile_b = tile;
-	p->ai.start_dir_b = dir;
-	p->ai.cur_dir_b = dir;
-
-	// And setup state.
-	p->ai.state_mode = 2;
-	p->ai.state_counter = 0;
-	p->ai.banned_tile_count = 0;
-}
-
-static StationID AiGetStationIdFromRoadBlock(TileIndex tile, int id)
-{
-	const AiDefaultBlockData *p = _road_default_block_data[id]->data;
-	while (p->mode != 1) p++;
-	return GetStationIndex(TILE_ADD(tile, ToTileIndexDiff(p->tileoffs)));
-}
-
-static void AiStateBuildRoadVehicles(Player *p)
-{
-	const AiDefaultBlockData *ptr;
-	TileIndex tile;
-	VehicleID loco_id;
-	EngineID veh;
-	uint i;
-
-	ptr = _road_default_block_data[p->ai.src.cur_building_rule]->data;
-	for (; ptr->mode != 0; ptr++) {}
-	tile = TILE_ADD(p->ai.src.use_tile, ToTileIndexDiff(ptr->tileoffs));
-
-	veh = AiChooseRoadVehToBuild(p->ai.cargo_type, p->player_money, tile);
-	if (veh == INVALID_ENGINE) {
-		p->ai.state = AIS_0;
-		return;
-	}
-
-	if (CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_ROAD_VEH))) return;
-
-	loco_id = _new_vehicle_id;
-
-	if (GetVehicle(loco_id)->cargo_type != p->ai.cargo_type) {
-		/* Cargo type doesn't match, so refit it */
-		if (CmdFailed(DoCommand(tile, loco_id, p->ai.cargo_type, DC_EXEC, CMD_REFIT_ROAD_VEH))) {
-			/* Refit failed... sell the vehicle */
-			DoCommand(tile, loco_id, 0, DC_EXEC, CMD_SELL_ROAD_VEH);
-			return;
-		}
-	}
-
-	for (i = 0; p->ai.order_list_blocks[i] != 0xFF; i++) {
-		const AiBuildRec* aib = &p->ai.src + p->ai.order_list_blocks[i];
-		bool is_pass = (
-			p->ai.cargo_type == CT_PASSENGERS ||
-			p->ai.cargo_type == CT_MAIL ||
-			(_opt.landscape == LT_NORMAL && p->ai.cargo_type == CT_VALUABLES)
-		);
-		Order order;
-
-		order.type = OT_GOTO_STATION;
-		order.flags = 0;
-		order.dest = AiGetStationIdFromRoadBlock(aib->use_tile, aib->cur_building_rule);
-
-		if (!is_pass && i == 1) order.flags |= OF_UNLOAD;
-		if (p->ai.num_want_fullload != 0 && (is_pass || i == 0))
-			order.flags |= OF_FULL_LOAD;
-
-		DoCommand(0, loco_id + (i << 16), PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
-	}
-
-	DoCommand(0, loco_id, 0, DC_EXEC, CMD_START_STOP_ROADVEH);
-	DoCommand(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
-
-	if (p->ai.num_want_fullload != 0) p->ai.num_want_fullload--;
-	if (--p->ai.num_loco_to_build == 0) p->ai.state = AIS_0;
-}
-
-static void AiStateDeleteRoadBlocks(Player *p)
-{
-	const AiBuildRec* aib = &p->ai.src;
-	uint num = p->ai.num_build_rec;
-
-	do {
-		const AiDefaultBlockData* b;
-
-		if (aib->cur_building_rule == 255) continue;
-		for (b = _road_default_block_data[aib->cur_building_rule]->data; b->mode != 4; b++) {
-			if (b->mode > 1) continue;
-			DoCommand(TILE_ADD(aib->use_tile, ToTileIndexDiff(b->tileoffs)), 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
-		}
-	} while (++aib,--num);
-
-	p->ai.state = AIS_0;
-}
-
-
-static void AiStateAirportStuff(Player *p)
-{
-	const Station* st;
-	byte acc_planes;
-	int i;
-	AiBuildRec *aib;
-	byte rule;
-
-	// Here we look for an airport we could use instead of building a new
-	// one. If we find such an aiport for any waypoint,
-	// AiStateBuildDefaultAirportBlocks() will kindly skip that one when
-	// building the waypoints.
-
-	i = 0;
-	do {
-		// We do this all twice - once for the source (town in the case
-		// of oilrig route) and then for the destination (oilrig in the
-		// case of oilrig route).
-		aib = &p->ai.src + i;
-
-		FOR_ALL_STATIONS(st) {
-			// Is this an airport?
-			if (!(st->facilities & FACIL_AIRPORT)) continue;
-
-			// Do we own the airport? (Oilrigs aren't owned, though.)
-			if (st->owner != OWNER_NONE && st->owner != _current_player) continue;
-
-			acc_planes = GetAirport(st->airport_type)->acc_planes;
-
-			// Dismiss heliports, unless we are checking an oilrig.
-			if (acc_planes == HELICOPTERS_ONLY && (p->ai.build_kind != 1 || i != 1))
-				continue;
-
-			// Dismiss country airports if we are doing the other
-			// endpoint of an oilrig route.
-			if (acc_planes == AIRCRAFT_ONLY && (p->ai.build_kind == 1 && i == 0))
-				continue;
-
-			// Dismiss airports too far away.
-			if (DistanceMax(st->airport_tile, aib->spec_tile) > aib->rand_rng)
-				continue;
-
-			// It's ideal airport, let's take it!
-
-			/* XXX: This part is utterly broken - rule should
-			 * contain number of the rule appropriate for the
-			 * airport type (country, town, ...), see
-			 * _airport_default_block_data (rule is just an index
-			 * in this array). But the only difference between the
-			 * currently existing two rules (rule 0 - town and rule
-			 * 1 - country) is the attr field which is used only
-			 * when building new airports - and that's irrelevant
-			 * for us. So using just about any rule will suffice
-			 * here for now (some of the new airport types would be
-			 * broken because they will probably need different
-			 * tileoff values etc), no matter that
-			 * IsHangarTile() makes no sense. --pasky */
-			if (acc_planes == HELICOPTERS_ONLY) {
-				/* Heliports should have maybe own rulesets but
-				 * OTOH we don't want AI to pick them up when
-				 * looking for a suitable airport type to build.
-				 * So any of rules 0 or 1 would do for now. The
-				 * original rule number was 2 but that's a bug
-				 * because we have no such rule. */
-				rule = 1;
-			} else {
-				rule = IsHangarTile(st->airport_tile);
-			}
-
-			aib->cur_building_rule = rule;
-			aib->use_tile = st->airport_tile;
-			break;
-		}
-	} while (++i != p->ai.num_build_rec);
-
-	p->ai.state = AIS_BUILD_DEFAULT_AIRPORT_BLOCKS;
-	p->ai.state_mode = 255;
-	p->ai.state_counter = 0;
-}
-
-static int32 AiDoBuildDefaultAirportBlock(TileIndex tile, const AiDefaultBlockData *p, byte flag)
-{
-	int32 total_cost = 0, ret;
-
-	for (; p->mode == 0; p++) {
-		if (!HASBIT(_avail_aircraft, p->attr)) return CMD_ERROR;
-		ret = DoCommand(TILE_MASK(tile + ToTileIndexDiff(p->tileoffs)), p->attr,0,flag | DC_AUTO | DC_NO_WATER,CMD_BUILD_AIRPORT);
-		if (CmdFailed(ret)) return CMD_ERROR;
-		total_cost += ret;
-	}
-
-	return total_cost;
-}
-
-static bool AiCheckAirportResources(TileIndex tile, const AiDefaultBlockData *p, byte cargo)
-{
-	uint values[NUM_CARGO];
-	int rad;
-
-	if (_patches.modified_catchment) {
-		rad = CA_AIR_LARGE; // I Have NFI what airport the
-	} else { // AI is going to build here
-		rad = 4;
-	}
-
-	for (; p->mode == 0; p++) {
-		TileIndex tile2 = TILE_ADD(tile, ToTileIndexDiff(p->tileoffs));
-		const AirportFTAClass* airport = GetAirport(p->attr);
-		uint w = airport->size_x;
-		uint h = airport->size_y;
-
-		if (cargo & 0x80) {
-			GetProductionAroundTiles(values, tile2, w, h, rad);
-			return values[cargo & 0x7F] != 0;
-		} else {
-			GetAcceptanceAroundTiles(values, tile2, w, h, rad);
-			return values[cargo] >= 8;
-		}
-	}
-	return true;
-}
-
-static int AiFindBestDefaultAirportBlock(TileIndex tile, byte cargo, byte heli, int32 *cost)
-{
-	const AiDefaultBlockData *p;
-	uint i;
-
-	for (i = 0; (p = _airport_default_block_data[i]) != NULL; i++) {
-		// If we are doing a helicopter service, avoid building
-		// airports where they can't land.
-		if (heli && GetAirport(p->attr)->acc_planes == AIRCRAFT_ONLY) continue;
-
-		*cost = AiDoBuildDefaultAirportBlock(tile, p, 0);
-		if (!CmdFailed(*cost) && AiCheckAirportResources(tile, p, cargo))
-			return i;
-	}
-	return -1;
-}
-
-static void AiStateBuildDefaultAirportBlocks(Player *p)
-{
-	int i, j;
-	AiBuildRec *aib;
-	int rule;
-	int32 cost;
-
-	// time out?
-	if (++p->ai.timeout_counter == 1388) {
-		p->ai.state = AIS_0;
-		return;
-	}
-
-	// do the following 8 times
-	i = 8;
-	do {
-		// check if we can build the default
-		aib = &p->ai.src;
-		j = p->ai.num_build_rec;
-		do {
-			// this item has already been built?
-			if (aib->cur_building_rule != 255) continue;
-
-			// adjust the coordinate randomly,
-			// to make sure that we find a position.
-			aib->use_tile = AdjustTileCoordRandomly(aib->spec_tile, aib->rand_rng);
-
-			// check if the aircraft stuff can be built there.
-			rule = AiFindBestDefaultAirportBlock(aib->use_tile, aib->cargo, p->ai.build_kind, &cost);
-
-//			SetRedErrorSquare(aib->use_tile);
-
-			if (rule == -1) {
-				// cannot build, terraform after a while
-				if (p->ai.state_counter >= 600) {
-					AiDoTerraformLand(aib->use_tile, Random()&3, 3, (int8)p->ai.state_mode);
-				}
-				// also try the other terraform direction
-				if (++p->ai.state_counter >= 1000) {
-					p->ai.state_counter = 0;
-					p->ai.state_mode = -p->ai.state_mode;
-				}
-			} else if (CheckPlayerHasMoney(cost) && AiCheckBlockDistances(p,aib->use_tile)) {
-				// player has money, build it.
-				int32 r;
-
-				aib->cur_building_rule = rule;
-
-				r = AiDoBuildDefaultAirportBlock(
-					aib->use_tile,
-					_airport_default_block_data[rule],
-					DC_EXEC | DC_NO_TOWN_RATING
-				);
-				assert(!CmdFailed(r));
-			}
-		} while (++aib,--j);
-	} while (--i);
-
-	// check if we're done with all of them
-	aib = &p->ai.src;
-	j = p->ai.num_build_rec;
-	do {
-		if (aib->cur_building_rule == 255) return;
-	} while (++aib,--j);
-
-	// yep, all are done. switch state.
-	p->ai.state = AIS_BUILD_AIRCRAFT_VEHICLES;
-}
-
-static StationID AiGetStationIdFromAircraftBlock(TileIndex tile, int id)
-{
-	const AiDefaultBlockData *p = _airport_default_block_data[id];
-	while (p->mode != 1) p++;
-	return GetStationIndex(TILE_ADD(tile, ToTileIndexDiff(p->tileoffs)));
-}
-
-static void AiStateBuildAircraftVehicles(Player *p)
-{
-	const AiDefaultBlockData *ptr;
-	TileIndex tile;
-	EngineID veh;
-	int i;
-	VehicleID loco_id;
-
-	ptr = _airport_default_block_data[p->ai.src.cur_building_rule];
-	for (; ptr->mode != 0; ptr++) {}
-
-	tile = TILE_ADD(p->ai.src.use_tile, ToTileIndexDiff(ptr->tileoffs));
-
-	veh = AiChooseAircraftToBuild(p->player_money, p->ai.build_kind != 0 ? 0 : AIR_CTOL);
-	if (veh == INVALID_ENGINE) return;
-
-	/* XXX - Have the AI pick the hangar terminal in an airport. Eg get airport-type
-	 * and offset to the FIRST depot because the AI picks the st->xy tile */
-	tile += ToTileIndexDiff(GetAirport(GetStationByTile(tile)->airport_type)->airport_depots[0]);
-	if (CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_AIRCRAFT))) return;
-	loco_id = _new_vehicle_id;
-
-	for (i = 0; p->ai.order_list_blocks[i] != 0xFF; i++) {
-		AiBuildRec *aib = (&p->ai.src) + p->ai.order_list_blocks[i];
-		bool is_pass = (p->ai.cargo_type == CT_PASSENGERS || p->ai.cargo_type == CT_MAIL);
-		Order order;
-
-		order.type = OT_GOTO_STATION;
-		order.flags = 0;
-		order.dest = AiGetStationIdFromAircraftBlock(aib->use_tile, aib->cur_building_rule);
-
-		if (!is_pass && i == 1) order.flags |= OF_UNLOAD;
-		if (p->ai.num_want_fullload != 0 && (is_pass || i == 0))
-			order.flags |= OF_FULL_LOAD;
-
-		DoCommand(0, loco_id + (i << 16), PackOrder(&order), DC_EXEC, CMD_INSERT_ORDER);
-	}
-
-	DoCommand(0, loco_id, 0, DC_EXEC, CMD_START_STOP_AIRCRAFT);
-
-	DoCommand(0, loco_id, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
-
-	if (p->ai.num_want_fullload != 0) p->ai.num_want_fullload--;
-
-	if (--p->ai.num_loco_to_build == 0) p->ai.state = AIS_0;
-}
-
-static void AiStateCheckShipStuff(Player *p)
-{
-	// XXX
-	error("!AiStateCheckShipStuff");
-}
-
-static void AiStateBuildDefaultShipBlocks(Player *p)
-{
-	// XXX
-	error("!AiStateBuildDefaultShipBlocks");
-}
-
-static void AiStateDoShipStuff(Player *p)
-{
-	// XXX
-	error("!AiStateDoShipStuff");
-}
-
-static void AiStateSellVeh(Player *p)
-{
-	Vehicle *v = p->ai.cur_veh;
-
-	if (v->owner == _current_player) {
-		if (v->type == VEH_Train) {
-
-			if (!IsTileDepotType(v->tile, TRANSPORT_RAIL) || v->u.rail.track != 0x80 || !(v->vehstatus&VS_STOPPED)) {
-				if (v->current_order.type != OT_GOTO_DEPOT)
-					DoCommand(0, v->index, 0, DC_EXEC, CMD_SEND_TRAIN_TO_DEPOT);
-				goto going_to_depot;
-			}
-
-			// Sell whole train
-			DoCommand(v->tile, v->index, 1, DC_EXEC, CMD_SELL_RAIL_WAGON);
-
-		} else if (v->type == VEH_Road) {
-			if (!IsRoadVehInDepotStopped(v)) {
-				if (v->current_order.type != OT_GOTO_DEPOT)
-					DoCommand(0, v->index, 0, DC_EXEC, CMD_SEND_ROADVEH_TO_DEPOT);
-				goto going_to_depot;
-			}
-
-			DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_ROAD_VEH);
-		} else if (v->type == VEH_Aircraft) {
-			if (!IsAircraftInHangarStopped(v)) {
-				if (v->current_order.type != OT_GOTO_DEPOT)
-					DoCommand(0, v->index, 0, DC_EXEC, CMD_SEND_AIRCRAFT_TO_HANGAR);
-				goto going_to_depot;
-			}
-
-			DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_AIRCRAFT);
-			} else if (v->type == VEH_Ship) {
-			// XXX: not implemented
-			error("!v->type == VEH_Ship");
-		}
-	}
-
-	goto return_to_loop;
-going_to_depot:;
-	if (++p->ai.state_counter <= 832) return;
-
-	if (v->current_order.type == OT_GOTO_DEPOT) {
-		v->current_order.type = OT_DUMMY;
-		v->current_order.flags = 0;
-		InvalidateWindow(WC_VEHICLE_VIEW, v->index);
-	}
-return_to_loop:;
-	p->ai.state = AIS_VEH_LOOP;
-}
-
-static void AiStateRemoveStation(Player *p)
-{
-	// Remove stations that aren't in use by any vehicle
-	byte *in_use;
-	const Order *ord;
-	const Station *st;
-	TileIndex tile;
-
-	// Go to this state when we're done.
-	p->ai.state = AIS_1;
-
-	// Get a list of all stations that are in use by a vehicle
-	in_use = malloc(GetMaxStationIndex() + 1);
-	memset(in_use, 0, GetMaxStationIndex() + 1);
-	FOR_ALL_ORDERS(ord) {
-		if (ord->type == OT_GOTO_STATION) in_use[ord->dest] = 1;
-	}
-
-	// Go through all stations and delete those that aren't in use
-	FOR_ALL_STATIONS(st) {
-		if (st->owner == _current_player && !in_use[st->index] &&
-				( (st->bus_stops != NULL && (tile = st->bus_stops->xy) != 0) ||
-					(st->truck_stops != NULL && (tile = st->truck_stops->xy)) != 0 ||
-					(tile = st->train_tile) != 0 ||
-					(tile = st->dock_tile) != 0 ||
-					(tile = st->airport_tile) != 0)) {
-			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
-		}
-	}
-
-	free(in_use);
-}
-
-static void AiRemovePlayerRailOrRoad(Player *p, TileIndex tile)
-{
-	TrackBits rails;
-
-	if (IsTileType(tile, MP_RAILWAY)) {
-		if (!IsTileOwner(tile, _current_player)) return;
-
-		if (IsPlainRailTile(tile)) {
-is_rail_crossing:;
-			rails = GetRailTrackStatus(tile);
-
-			if (rails == TRACK_BIT_HORZ || rails == TRACK_BIT_VERT) return;
-
-			if (rails & TRACK_BIT_3WAY_NE) {
-pos_0:
-				if ((GetRailTrackStatus(TILE_MASK(tile - TileDiffXY(1, 0))) & TRACK_BIT_3WAY_SW) == 0) {
-					p->ai.cur_dir_a = 0;
-					p->ai.cur_tile_a = tile;
-					p->ai.state = AIS_REMOVE_SINGLE_RAIL_TILE;
-					return;
-				}
-			}
-
-			if (rails & TRACK_BIT_3WAY_SE) {
-pos_1:
-				if ((GetRailTrackStatus(TILE_MASK(tile + TileDiffXY(0, 1))) & TRACK_BIT_3WAY_NW) == 0) {
-					p->ai.cur_dir_a = 1;
-					p->ai.cur_tile_a = tile;
-					p->ai.state = AIS_REMOVE_SINGLE_RAIL_TILE;
-					return;
-				}
-			}
-
-			if (rails & TRACK_BIT_3WAY_SW) {
-pos_2:
-				if ((GetRailTrackStatus(TILE_MASK(tile + TileDiffXY(1, 0))) & TRACK_BIT_3WAY_NE) == 0) {
-					p->ai.cur_dir_a = 2;
-					p->ai.cur_tile_a = tile;
-					p->ai.state = AIS_REMOVE_SINGLE_RAIL_TILE;
-					return;
-				}
-			}
-
-			if (rails & TRACK_BIT_3WAY_NW) {
-pos_3:
-				if ((GetRailTrackStatus(TILE_MASK(tile - TileDiffXY(0, 1))) & TRACK_BIT_3WAY_SE) == 0) {
-					p->ai.cur_dir_a = 3;
-					p->ai.cur_tile_a = tile;
-					p->ai.state = AIS_REMOVE_SINGLE_RAIL_TILE;
-					return;
-				}
-			}
-		} else {
-			static const byte _depot_bits[] = {0x19,0x16,0x25,0x2A};
-
-			DiagDirection dir = GetRailDepotDirection(tile);
-
-			if (GetRailTrackStatus(tile + TileOffsByDiagDir(dir)) & _depot_bits[dir])
-				return;
-
-			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
-		}
-	} else if (IsTileType(tile, MP_STREET)) {
-		if (!IsTileOwner(tile, _current_player)) return;
-
-		if (IsLevelCrossing(tile)) goto is_rail_crossing;
-
-		if (GetRoadTileType(tile) == ROAD_TILE_DEPOT) {
-			DiagDirection dir;
-			TileIndex t;
-
-			// Check if there are any stations around.
-			t = tile + TileDiffXY(-1, 0);
-			if (IsTileType(t, MP_STATION) && IsTileOwner(t, _current_player)) return;
-
-			t = tile + TileDiffXY(1, 0);
-			if (IsTileType(t, MP_STATION) && IsTileOwner(t, _current_player)) return;
-
-			t = tile + TileDiffXY(0, -1);
-			if (IsTileType(t, MP_STATION) && IsTileOwner(t, _current_player)) return;
-
-			t = tile + TileDiffXY(0, 1);
-			if (IsTileType(t, MP_STATION) && IsTileOwner(t, _current_player)) return;
-
-			dir = GetRoadDepotDirection(tile);
-
-			DoCommand(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
-			DoCommand(
-				TILE_MASK(tile + TileOffsByDiagDir(dir)),
-				DiagDirToRoadBits(ReverseDiagDir(dir)),
-				0,
-				DC_EXEC,
-				CMD_REMOVE_ROAD);
-		}
-	} else if (IsTileType(tile, MP_TUNNELBRIDGE)) {
-		if (!IsTileOwner(tile, _current_player) ||
-				!IsBridge(tile) ||
-				GetBridgeTransportType(tile) != TRANSPORT_RAIL) {
-			return;
-		}
-
-		rails = 0;
-
-		switch (GetBridgeRampDirection(tile)) {
-			default:
-			case DIAGDIR_NE: goto pos_2;
-			case DIAGDIR_SE: goto pos_3;
-			case DIAGDIR_SW: goto pos_0;
-			case DIAGDIR_NW: goto pos_1;
-		}
-	}
-}
-
-static void AiStateRemoveTrack(Player *p)
-{
-	/* Was 1000 for standard 8x8 maps. */
-	int num = MapSizeX() * 4;
-
-	do {
-		TileIndex tile = ++p->ai.state_counter;
-
-		// Iterated all tiles?
-		if (tile >= MapSize()) {
-			p->ai.state = AIS_REMOVE_STATION;
-			return;
-		}
-
-		// Remove player stuff in that tile
-		AiRemovePlayerRailOrRoad(p, tile);
-		if (p->ai.state != AIS_REMOVE_TRACK) return;
-	} while (--num);
-}
-
-static void AiStateRemoveSingleRailTile(Player *p)
-{
-	// Remove until we can't remove more.
-	if (!AiRemoveTileAndGoForward(p)) p->ai.state = AIS_REMOVE_TRACK;
-}
-
-static AiStateAction * const _ai_actions[] = {
-	AiCase0,
-	AiCase1,
-	AiStateVehLoop,
-	AiStateCheckReplaceVehicle,
-	AiStateDoReplaceVehicle,
-	AiStateWantNewRoute,
-
-	AiStateBuildDefaultRailBlocks,
-	AiStateBuildRail,
-	AiStateBuildRailVeh,
-	AiStateDeleteRailBlocks,
-
-	AiStateBuildDefaultRoadBlocks,
-	AiStateBuildRoad,
-	AiStateBuildRoadVehicles,
-	AiStateDeleteRoadBlocks,
-
-	AiStateAirportStuff,
-	AiStateBuildDefaultAirportBlocks,
-	AiStateBuildAircraftVehicles,
-
-	AiStateCheckShipStuff,
-	AiStateBuildDefaultShipBlocks,
-	AiStateDoShipStuff,
-
-	AiStateSellVeh,
-	AiStateRemoveStation,
-	AiStateRemoveTrack,
-
-	AiStateRemoveSingleRailTile
-};
-
-extern void ShowBuyCompanyDialog(uint player);
-
-static void AiHandleTakeover(Player *p)
-{
-	if (p->bankrupt_timeout != 0) {
-		p->bankrupt_timeout -= 8;
-		if (p->bankrupt_timeout > 0) return;
-		p->bankrupt_timeout = 0;
-		DeleteWindowById(WC_BUY_COMPANY, _current_player);
-		if (IsLocalPlayer()) {
-			AskExitToGameMenu();
-			return;
-		}
-		if (IsHumanPlayer(_current_player)) return;
-	}
-
-	if (p->bankrupt_asked == 255) return;
-
-	{
-		uint asked = p->bankrupt_asked;
-		Player *pp, *best_pl = NULL;
-		int32 best_val = -1;
-		uint old_p;
-
-		// Ask the guy with the highest performance hist.
-		FOR_ALL_PLAYERS(pp) {
-			if (pp->is_active &&
-					!(asked&1) &&
-					pp->bankrupt_asked == 0 &&
-					best_val < pp->old_economy[1].performance_history) {
-				best_val = pp->old_economy[1].performance_history;
-				best_pl = pp;
-			}
-			asked>>=1;
-		}
-
-		// Asked all players?
-		if (best_val == -1) {
-			p->bankrupt_asked = 255;
-			return;
-		}
-
-		SETBIT(p->bankrupt_asked, best_pl->index);
-
-		if (best_pl->index == _local_player) {
-			p->bankrupt_timeout = 4440;
-			ShowBuyCompanyDialog(_current_player);
-			return;
-		}
-		if (IsHumanPlayer(best_pl->index)) return;
-
-		// Too little money for computer to buy it?
-		if (best_pl->player_money >> 1 >= p->bankrupt_value) {
-			// Computer wants to buy it.
-			old_p = _current_player;
-			_current_player = p->index;
-			DoCommand(0, old_p, 0, DC_EXEC, CMD_BUY_COMPANY);
-			_current_player = old_p;
-		}
-	}
-}
-
-static void AiAdjustLoan(const Player* p)
-{
-	int32 base = AiGetBasePrice(p);
-
-	if (p->player_money > base * 1400) {
-		// Decrease loan
-		if (p->current_loan != 0) {
-			DoCommand(0, 0, 0, DC_EXEC, CMD_DECREASE_LOAN);
-		}
-	} else if (p->player_money < base * 500) {
-		// Increase loan
-		if (p->current_loan < _economy.max_loan &&
-				p->num_valid_stat_ent >= 2 &&
-				-(p->old_economy[0].expenses+p->old_economy[1].expenses) < base * 60) {
-			DoCommand(0, 0, 0, DC_EXEC, CMD_INCREASE_LOAN);
-		}
-	}
-}
-
-static void AiBuildCompanyHQ(Player *p)
-{
-	TileIndex tile;
-
-	if (p->location_of_house == 0 &&
-			p->last_build_coordinate != 0) {
-		tile = AdjustTileCoordRandomly(p->last_build_coordinate, 8);
-		DoCommand(tile, 0, 0, DC_EXEC | DC_AUTO | DC_NO_WATER, CMD_BUILD_COMPANY_HQ);
-	}
-}
-
-
-void AiDoGameLoop(Player *p)
-{
-	if (p->bankrupt_asked != 0) {
-		AiHandleTakeover(p);
-		return;
-	}
-
-	// Ugly hack to make sure the service interval of the AI is good, not looking
-	//  to the patch-setting
-	// Also, it takes into account the setting if the service-interval is in days
-	//  or in %
-	_ai_service_interval = _patches.servint_ispercent?80:180;
-
-	if (IsHumanPlayer(_current_player)) return;
-
-	AiAdjustLoan(p);
-	AiBuildCompanyHQ(p);
-
-#if 0
-	{
-		static byte old_state = 99;
-		static bool hasdots = false;
-		char *_ai_state_names[]={
-			"AiCase0",
-			"AiCase1",
-			"AiStateVehLoop",
-			"AiStateCheckReplaceVehicle",
-			"AiStateDoReplaceVehicle",
-			"AiStateWantNewRoute",
-			"AiStateBuildDefaultRailBlocks",
-			"AiStateBuildRail",
-			"AiStateBuildRailVeh",
-			"AiStateDeleteRailBlocks",
-			"AiStateBuildDefaultRoadBlocks",
-			"AiStateBuildRoad",
-			"AiStateBuildRoadVehicles",
-			"AiStateDeleteRoadBlocks",
-			"AiStateAirportStuff",
-			"AiStateBuildDefaultAirportBlocks",
-			"AiStateBuildAircraftVehicles",
-			"AiStateCheckShipStuff",
-			"AiStateBuildDefaultShipBlocks",
-			"AiStateDoShipStuff",
-			"AiStateSellVeh",
-			"AiStateRemoveStation",
-			"AiStateRemoveTrack",
-			"AiStateRemoveSingleRailTile"
-		};
-
-		if (p->ai.state != old_state) {
-			if (hasdots)
-				printf("\n");
-			hasdots=false;
-			printf("AiState: %s\n", _ai_state_names[old_state=p->ai.state]);
-		} else {
-			printf(".");
-			hasdots=true;
-		}
-	}
-#endif
-
-	_ai_actions[p->ai.state](p);
-}