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changeset 12114:f020ec6be498 draft

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(svn r16527) -Codechange: use static member functions instead of simple casts when converting Vehicle to specialised vehicle types. Includes safety check
author smatz <smatz@openttd.org>
date Sat, 06 Jun 2009 16:54:22 +0000
parents d1451dc437a3
children 6318d41ef9ef
files src/ai/api/ai_vehicle.cpp src/aircraft_gui.cpp src/articulated_vehicles.cpp src/autoreplace_cmd.cpp src/depot_gui.cpp src/disaster_cmd.cpp src/economy.cpp src/newgrf_engine.cpp src/npf.cpp src/openttd.cpp src/order_cmd.cpp src/pbs.cpp src/rail_cmd.cpp src/road_cmd.cpp src/roadveh_cmd.cpp src/roadveh_gui.cpp src/saveload/afterload.cpp src/saveload/oldloader_sl.cpp src/saveload/vehicle_sl.cpp src/signal.cpp src/station_cmd.cpp src/train_cmd.cpp src/train_gui.cpp src/tunnelbridge_cmd.cpp src/vehicle.cpp src/vehicle_base.h src/vehicle_cmd.cpp src/vehicle_gui.cpp src/vehicle_type.h src/vehiclelist.cpp src/water_cmd.cpp src/yapf/follow_track.hpp src/yapf/yapf_costrail.hpp src/yapf/yapf_destrail.hpp src/yapf/yapf_rail.cpp src/yapf/yapf_road.cpp
diffstat 36 files changed, 185 insertions(+), 161 deletions(-) [+]
line wrap: on
line diff
--- a/src/ai/api/ai_vehicle.cpp
+++ b/src/ai/api/ai_vehicle.cpp
@@ -46,11 +46,11 @@
 		case VEH_ROAD: {
 			uint total_length = 0;
 			for (const Vehicle *u = v; u != NULL; u = u->Next()) {
-				total_length += ((const RoadVehicle *)u)->rcache.cached_veh_length;
+				total_length += ::RoadVehicle::From(u)->rcache.cached_veh_length;
 			}
 			return total_length;
 		}
-		case VEH_TRAIN: return ((const Train *)v)->tcache.cached_total_length;
+		case VEH_TRAIN: return ::Train::From(v)->tcache.cached_total_length;
 		default: return -1;
 	}
 }
@@ -86,11 +86,11 @@
 	EnforcePrecondition(false, ::Vehicle::Get(source_vehicle_id)->type == VEH_TRAIN);
 	EnforcePrecondition(false, dest_vehicle_id == -1 || ::Vehicle::Get(dest_vehicle_id)->type == VEH_TRAIN);
 
-	const Train *v = (const Train *)::Vehicle::Get(source_vehicle_id);
+	const Train *v = ::Train::Get(source_vehicle_id);
 	while (source_wagon-- > 0) v = GetNextUnit(v);
 	const Train *w = NULL;
 	if (dest_vehicle_id != -1) {
-		w = (const Train *)::Vehicle::Get(dest_vehicle_id);
+		w = ::Train::Get(dest_vehicle_id);
 		while (dest_wagon-- > 0) w = GetNextUnit(w);
 	}
 
@@ -137,7 +137,7 @@
 	EnforcePrecondition(false, IsValidVehicle(vehicle_id) && wagon < GetNumWagons(vehicle_id));
 	EnforcePrecondition(false, ::Vehicle::Get(vehicle_id)->type == VEH_TRAIN);
 
-	const Train *v = (const Train *)::Vehicle::Get(vehicle_id);
+	const Train *v = ::Train::Get(vehicle_id);
 	while (wagon-- > 0) v = GetNextUnit(v);
 
 	return AIObject::DoCommand(0, v->index, sell_attached_wagons ? 1 : 0, CMD_SELL_RAIL_WAGON);
@@ -244,7 +244,7 @@
 
 	const Vehicle *v = ::Vehicle::Get(vehicle_id);
 	if (v->type == VEH_TRAIN) {
-		while (wagon-- > 0) v = GetNextUnit((const Train *)v);
+		while (wagon-- > 0) v = GetNextUnit(::Train::From(v));
 	}
 	return v->engine_type;
 }
@@ -282,7 +282,7 @@
 
 	const Vehicle *v = ::Vehicle::Get(vehicle_id);
 	if (v->type == VEH_TRAIN) {
-		while (wagon-- > 0) v = GetNextUnit((const Train *)v);
+		while (wagon-- > 0) v = GetNextUnit(::Train::From(v));
 	}
 	return v->age;
 }
@@ -369,7 +369,7 @@
 	if (!IsValidVehicle(vehicle_id)) return AIRoad::ROADTYPE_INVALID;
 	if (GetVehicleType(vehicle_id) != VT_ROAD) return AIRoad::ROADTYPE_INVALID;
 
-	return (AIRoad::RoadType)((RoadVehicle*)::Vehicle::Get(vehicle_id))->roadtype;
+	return (AIRoad::RoadType)(::RoadVehicle::Get(vehicle_id))->roadtype;
 }
 
 /* static */ int32 AIVehicle::GetCapacity(VehicleID vehicle_id, CargoID cargo)
@@ -412,8 +412,8 @@
 
 	const Vehicle *v = ::Vehicle::Get(vehicle_id);
 	switch (v->type) {
-		case VEH_ROAD: return RoadVehHasArticPart(v);
-		case VEH_TRAIN: return EngineHasArticPart(v);
+		case VEH_ROAD: return ::RoadVehHasArticPart(v);
+		case VEH_TRAIN: return ::EngineHasArticPart(v);
 		default: NOT_REACHED();
 	}
 }
--- a/src/aircraft_gui.cpp
+++ b/src/aircraft_gui.cpp
@@ -67,7 +67,7 @@
 	SpriteID pal = (v->vehstatus & VS_CRASHED) ? PALETTE_CRASH : GetVehiclePalette(v);
 	DrawSprite(v->GetImage(DIR_W), pal, x + 25, y + 10);
 	if (v->subtype == AIR_HELICOPTER) {
-		const Aircraft *a = (const Aircraft *)v;
+		const Aircraft *a = Aircraft::From(v);
 		SpriteID rotor_sprite = GetCustomRotorSprite(a, true);
 		if (rotor_sprite == 0) rotor_sprite = SPR_ROTOR_STOPPED;
 		DrawSprite(rotor_sprite, PAL_NONE, x + 25, y + 5);
--- a/src/articulated_vehicles.cpp
+++ b/src/articulated_vehicles.cpp
@@ -208,7 +208,7 @@
 
 		switch (v->type) {
 			case VEH_TRAIN:
-				v = (EngineHasArticPart((const Train *)v) ? GetNextArticPart((const Train *)v) : NULL);
+				v = (EngineHasArticPart(Train::From(v)) ? GetNextArticPart(Train::From(v)) : NULL);
 				break;
 
 			case VEH_ROAD:
@@ -256,7 +256,7 @@
 
 		switch (v->type) {
 			case VEH_TRAIN:
-				v = (EngineHasArticPart((const Train *)v) ? GetNextArticPart((const Train *)v) : NULL);
+				v = (EngineHasArticPart(Train::From(v)) ? GetNextArticPart(Train::From(v)) : NULL);
 				break;
 
 			case VEH_ROAD:
@@ -305,7 +305,7 @@
 			default: NOT_REACHED();
 
 			case VEH_TRAIN: {
-				Train *front = (Train *)first;
+				Train *front = Train::From(first);
 				Train *t = new Train();
 				v->SetNext(t);
 				v = t;
@@ -328,7 +328,7 @@
 			} break;
 
 			case VEH_ROAD: {
-				RoadVehicle *front = (RoadVehicle *)first;
+				RoadVehicle *front = RoadVehicle::From(first);
 				RoadVehicle *rv = new RoadVehicle();
 				v->SetNext(rv);
 				v = rv;
--- a/src/autoreplace_cmd.cpp
+++ b/src/autoreplace_cmd.cpp
@@ -92,18 +92,18 @@
 	assert(!part_of_chain || new_head->IsPrimaryVehicle());
 	/* Loop through source parts */
 	for (Vehicle *src = old_veh; src != NULL; src = src->Next()) {
-		if (!part_of_chain && src->type == VEH_TRAIN && src != old_veh && src != ((Train *)old_veh)->other_multiheaded_part && !IsArticulatedPart(src)) {
+		if (!part_of_chain && src->type == VEH_TRAIN && src != old_veh && src != Train::From(old_veh)->other_multiheaded_part && !IsArticulatedPart(src)) {
 			/* Skip vehicles, which do not belong to old_veh */
-			src = GetLastEnginePart((Train *)src);
+			src = GetLastEnginePart(Train::From(src));
 			continue;
 		}
 		if (src->cargo_type >= NUM_CARGO || src->cargo.Count() == 0) continue;
 
 		/* Find free space in the new chain */
 		for (Vehicle *dest = new_head; dest != NULL && src->cargo.Count() > 0; dest = dest->Next()) {
-			if (!part_of_chain && dest->type == VEH_TRAIN && dest != new_head && dest != ((Train *)new_head)->other_multiheaded_part && !IsArticulatedPart(dest)) {
+			if (!part_of_chain && dest->type == VEH_TRAIN && dest != new_head && dest != Train::From(new_head)->other_multiheaded_part && !IsArticulatedPart(dest)) {
 				/* Skip vehicles, which do not belong to new_head */
-				dest = GetLastEnginePart((Train *)dest);
+				dest = GetLastEnginePart(Train::From(dest));
 				continue;
 			}
 			if (dest->cargo_type != src->cargo_type) continue;
@@ -116,7 +116,7 @@
 	}
 
 	/* Update train weight etc., the old vehicle will be sold anyway */
-	if (part_of_chain && new_head->type == VEH_TRAIN) TrainConsistChanged((Train *)new_head, true);
+	if (part_of_chain && new_head->type == VEH_TRAIN) TrainConsistChanged(Train::From(new_head), true);
 }
 
 /**
@@ -269,7 +269,7 @@
 	}
 
 	/* Try to reverse the vehicle, but do not care if it fails as the new type might not be reversible */
-	if (new_veh->type == VEH_TRAIN && HasBit(((Train *)old_veh)->flags, VRF_REVERSE_DIRECTION)) {
+	if (new_veh->type == VEH_TRAIN && HasBit(Train::From(old_veh)->flags, VRF_REVERSE_DIRECTION)) {
 		DoCommand(0, new_veh->index, true, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
 	}
 
@@ -403,10 +403,10 @@
 
 	if (old_head->type == VEH_TRAIN) {
 		/* Store the length of the old vehicle chain, rounded up to whole tiles */
-		uint16 old_total_length = (((Train *)old_head)->tcache.cached_total_length + TILE_SIZE - 1) / TILE_SIZE * TILE_SIZE;
+		uint16 old_total_length = (Train::From(old_head)->tcache.cached_total_length + TILE_SIZE - 1) / TILE_SIZE * TILE_SIZE;
 
 		int num_units = 0; ///< Number of units in the chain
-		for (Train *w = (Train *)old_head; w != NULL; w = GetNextUnit(w)) num_units++;
+		for (Train *w = Train::From(old_head); w != NULL; w = GetNextUnit(w)) num_units++;
 
 		Train **old_vehs = CallocT<Train *>(num_units); ///< Will store vehicles of the old chain in their order
 		Train **new_vehs = CallocT<Train *>(num_units); ///< New vehicles corresponding to old_vehs or NULL if no replacement
@@ -416,7 +416,7 @@
 		 * Note: The replacement vehicles can only successfully build as long as the old vehicles are still in their chain */
 		int i;
 		Train *w;
-		for (w = (Train *)old_head, i = 0; w != NULL; w = GetNextUnit(w), i++) {
+		for (w = Train::From(old_head), i = 0; w != NULL; w = GetNextUnit(w), i++) {
 			assert(i < num_units);
 			old_vehs[i] = w;
 
@@ -432,7 +432,7 @@
 		/* Note: When autoreplace has already failed here, old_vehs[] is not completely initialized. But it is also not needed. */
 		if (cost.Succeeded()) {
 			/* Separate the head, so we can start constructing the new chain */
-			Train *second = GetNextUnit((Train *)old_head);
+			Train *second = GetNextUnit(Train::From(old_head));
 			if (second != NULL) cost.AddCost(MoveVehicle(second, NULL, DC_EXEC | DC_AUTOREPLACE, true));
 
 			assert(GetNextUnit(new_head) == NULL);
@@ -538,10 +538,10 @@
 			 * Note: The vehicle attach callback is disabled here :) */
 			if ((flags & DC_EXEC) == 0) {
 				/* Separate the head, so we can reattach the old vehicles */
-				Train *second = GetNextUnit((Train *)old_head);
+				Train *second = GetNextUnit(Train::From(old_head));
 				if (second != NULL) MoveVehicle(second, NULL, DC_EXEC | DC_AUTOREPLACE, true);
 
-				assert(GetNextUnit((Train *)old_head) == NULL);
+				assert(GetNextUnit(Train::From(old_head)) == NULL);
 
 				for (int i = num_units - 1; i > 0; i--) {
 					CommandCost ret = MoveVehicle(old_vehs[i], old_head, DC_EXEC | DC_AUTOREPLACE, false);
@@ -632,7 +632,7 @@
 	bool any_replacements = false;
 	while (w != NULL && !any_replacements) {
 		any_replacements = (GetNewEngineType(w, c) != INVALID_ENGINE);
-		w = (!free_wagon && w->type == VEH_TRAIN ? GetNextUnit((Train *)w) : NULL);
+		w = (!free_wagon && w->type == VEH_TRAIN ? GetNextUnit(Train::From(w)) : NULL);
 	}
 
 	if (any_replacements) {
--- a/src/depot_gui.cpp
+++ b/src/depot_gui.cpp
@@ -272,7 +272,7 @@
 				DrawTrainImage(v, x + 21, sprite_y, this->sel, this->hscroll.cap + 4, this->hscroll.pos);
 
 				/* Number of wagons relative to a standard length wagon (rounded up) */
-				SetDParam(0, (((const Train *)v)->tcache.cached_total_length + 7) / 8);
+				SetDParam(0, (Train::From(v)->tcache.cached_total_length + 7) / 8);
 				DrawString(this->widget[DEPOT_WIDGET_MATRIX].left, this->widget[DEPOT_WIDGET_MATRIX].right - 1, y + 4, STR_TINY_BLACK, TC_FROMSTRING, SA_RIGHT); // Draw the counter
 				break;
 
@@ -328,7 +328,7 @@
 			hnum = 8;
 			for (uint num = 0; num < this->vehicle_list.Length(); num++) {
 				const Vehicle *v = this->vehicle_list[num];
-				hnum = max(hnum, ((const Train *)v)->tcache.cached_total_length);
+				hnum = max(hnum, Train::From(v)->tcache.cached_total_length);
 			}
 			/* Always have 1 empty row, so people can change the setting of the train */
 			SetVScrollCount(w, this->vehicle_list.Length() + this->wagon_list.Length() + 1);
@@ -450,7 +450,7 @@
 				x += skip;
 
 				/* find the vehicle in this row that was clicked */
-				while (v != NULL && (x -= ((const Train *)v)->tcache.cached_veh_length) >= 0) v = v->Next();
+				while (v != NULL && (x -= Train::From(v)->tcache.cached_veh_length) >= 0) v = v->Next();
 
 				/* if an articulated part was selected, find its parent */
 				while (v != NULL && IsArticulatedPart(v)) v = v->Previous();
@@ -514,11 +514,11 @@
 
 					switch (v->type) {
 						case VEH_TRAIN:
-							_cursor.short_vehicle_offset = 16 - ((const Train *)v)->tcache.cached_veh_length * 2;
+							_cursor.short_vehicle_offset = 16 - Train::From(v)->tcache.cached_veh_length * 2;
 							break;
 
 						case VEH_ROAD:
-							_cursor.short_vehicle_offset = 16 - ((const RoadVehicle *)v)->rcache.cached_veh_length * 2;
+							_cursor.short_vehicle_offset = 16 - RoadVehicle::From(v)->rcache.cached_veh_length * 2;
 							break;
 
 						default:
--- a/src/disaster_cmd.cpp
+++ b/src/disaster_cmd.cpp
@@ -313,9 +313,8 @@
 		return false;
 	} else {
 		/* Target a vehicle */
-		Vehicle *u_tmp = Vehicle::Get(v->dest_tile);
-		assert(u_tmp != NULL && u_tmp->type == VEH_ROAD && IsRoadVehFront(u_tmp));
-		RoadVehicle *u = (RoadVehicle *)u_tmp;
+		RoadVehicle *u = RoadVehicle::Get(v->dest_tile);
+		assert(u != NULL && u->type == VEH_ROAD && IsRoadVehFront(u));
 
 		uint dist = Delta(v->x_pos, u->x_pos) + Delta(v->y_pos, u->y_pos);
 
--- a/src/economy.cpp
+++ b/src/economy.cpp
@@ -1314,7 +1314,7 @@
 		/* update stats */
 		int t;
 		switch (u->type) {
-			case VEH_TRAIN: t = ((Train *)u)->tcache.cached_max_speed; break;
+			case VEH_TRAIN: t = Train::From(u)->tcache.cached_max_speed; break;
 			case VEH_ROAD:  t = u->max_speed / 2;           break;
 			default:        t = u->max_speed;               break;
 		}
@@ -1423,7 +1423,7 @@
 
 	if (v->type == VEH_TRAIN) {
 		/* Each platform tile is worth 2 rail vehicles. */
-		int overhang = ((Train *)v)->tcache.cached_total_length - st->GetPlatformLength(v->tile) * TILE_SIZE;
+		int overhang = Train::From(v)->tcache.cached_total_length - st->GetPlatformLength(v->tile) * TILE_SIZE;
 		if (overhang > 0) {
 			unloading_time <<= 1;
 			unloading_time += (overhang * unloading_time) / 8;
--- a/src/newgrf_engine.cpp
+++ b/src/newgrf_engine.cpp
@@ -434,9 +434,9 @@
 		if (!Company::IsValidID(_current_company)) return 0;
 		l = GetEngineLivery(engine, _current_company, INVALID_ENGINE, NULL);
 	} else if (v->type == VEH_TRAIN) {
-		l = GetEngineLivery(v->engine_type, v->owner, ((const Train *)v)->tcache.first_engine, v);
+		l = GetEngineLivery(v->engine_type, v->owner, Train::From(v)->tcache.first_engine, v);
 	} else if (v->type == VEH_ROAD) {
-		l = GetEngineLivery(v->engine_type, v->owner, ((const RoadVehicle *)v)->rcache.first_engine, v);
+		l = GetEngineLivery(v->engine_type, v->owner, RoadVehicle::From(v)->rcache.first_engine, v);
 	} else {
 		l = GetEngineLivery(v->engine_type, v->owner, INVALID_ENGINE, v);
 	}
@@ -534,7 +534,7 @@
 				memset(common_subtypes, 0, sizeof(common_subtypes));
 
 				for (u = v; u != NULL; u = u->Next()) {
-					if (v->type == VEH_TRAIN) user_def_data |= ((const Train *)u)->tcache.user_def_data;
+					if (v->type == VEH_TRAIN) user_def_data |= Train::From(u)->tcache.user_def_data;
 
 					/* Skip empty engines */
 					if (u->cargo_cap == 0) continue;
@@ -590,7 +590,7 @@
 				uint16 altitude = v->z_pos - w->z_pos; // Aircraft height - shadow height
 				byte airporttype = ATP_TTDP_LARGE;
 
-				const Station *st = GetTargetAirportIfValid((Aircraft *)v);
+				const Station *st = GetTargetAirportIfValid(Aircraft::From(v));
 
 				if (st != NULL) {
 					switch (st->airport_type) {
@@ -668,7 +668,7 @@
 			uint16 modflags = 0;
 
 			if (v->type == VEH_TRAIN) {
-				const Train *t = (const Train *)v;
+				const Train *t = Train::From(v);
 				const Train *u = IsTrainWagon(v) && HasBit(v->vehicle_flags, VRF_POWEREDWAGON) ? t->First() : t;
 				RailType railtype = GetRailType(v->tile);
 				bool powered = IsTrainEngine(v) || (IsTrainWagon(v) && HasBit(v->vehicle_flags, VRF_POWEREDWAGON));
@@ -736,7 +736,7 @@
 		case 0x47: return GB(Engine::Get(v->engine_type)->internal_id, 8, 8);
 		case 0x48:
 			if (v->type != VEH_TRAIN || v->spritenum != 0xFD) return v->spritenum;
-			return HasBit(((Train *)v)->flags, VRF_REVERSE_DIRECTION) ? 0xFE : 0xFD;
+			return HasBit(Train::From(v)->flags, VRF_REVERSE_DIRECTION) ? 0xFE : 0xFD;
 
 		case 0x49: return v->day_counter;
 		case 0x4A: return v->breakdowns_since_last_service;
@@ -768,7 +768,7 @@
 	/* Vehicle specific properties */
 	switch (v->type) {
 		case VEH_TRAIN: {
-			Train *t = (Train *)v;
+			Train *t = Train::From(v);
 			switch (variable - 0x80) {
 				case 0x62: return t->track;
 				case 0x66: return t->railtype;
@@ -784,7 +784,7 @@
 		} break;
 
 		case VEH_ROAD: {
-			RoadVehicle *rv = (RoadVehicle *)v;
+			RoadVehicle *rv = RoadVehicle::From(v);
 			switch (variable - 0x80) {
 				case 0x62: return rv->state;
 				case 0x64: return rv->blocked_ctr;
@@ -797,7 +797,7 @@
 		} break;
 
 		case VEH_AIRCRAFT: {
-			Aircraft *a = (Aircraft *)v;
+			Aircraft *a = Aircraft::From(v);
 			switch (variable - 0x80) {
 				case 0x62: return MapAircraftMovementState(a);  // Current movement state
 				case 0x63: return a->targetairport;             // Airport to which the action refers
@@ -886,10 +886,10 @@
 			/* We always use cached value, except for callbacks because the override spriteset
 			 * to use may be different than the one cached. It happens for callback 0x15 (refit engine),
 			 * as v->cargo_type is temporary changed to the new type */
-			group = use_cache ? ((const Train *)v)->tcache.cached_override : GetWagonOverrideSpriteSet(v->engine_type, v->cargo_type, ((const Train *)v)->tcache.first_engine);
+			group = use_cache ? Train::From(v)->tcache.cached_override : GetWagonOverrideSpriteSet(v->engine_type, v->cargo_type, Train::From(v)->tcache.first_engine);
 			if (group != NULL) return group;
 		} else if (v->type == VEH_ROAD) {
-			group = GetWagonOverrideSpriteSet(v->engine_type, v->cargo_type, ((const RoadVehicle *)v)->rcache.first_engine);
+			group = GetWagonOverrideSpriteSet(v->engine_type, v->cargo_type, RoadVehicle::From(v)->rcache.first_engine);
 			if (group != NULL) return group;
 		}
 	}
@@ -952,7 +952,7 @@
 bool UsesWagonOverride(const Vehicle *v)
 {
 	assert(v->type == VEH_TRAIN);
-	return ((const Train *)v)->tcache.cached_override != NULL;
+	return Train::From(v)->tcache.cached_override != NULL;
 }
 
 /**
--- a/src/npf.cpp
+++ b/src/npf.cpp
@@ -425,7 +425,7 @@
 /** Find any safe and free tile. */
 static int32 NPFFindSafeTile(AyStar *as, OpenListNode *current)
 {
-	const Train *v = (const Train *)((NPFFindStationOrTileData*)as->user_target)->v;
+	const Train *v = Train::From(((NPFFindStationOrTileData *)as->user_target)->v);
 
 	return
 		IsSafeWaitingPosition(v, current->path.node.tile, current->path.node.direction, true, _settings_game.pf.forbid_90_deg) &&
@@ -506,7 +506,7 @@
 
 	if (as->user_target != NULL && ((NPFFindStationOrTileData*)as->user_target)->reserve_path && as->user_data[NPF_TYPE] == TRANSPORT_RAIL) {
 		/* Path reservation is requested. */
-		const Train *v = (const Train *)((NPFFindStationOrTileData*)as->user_target)->v;
+		const Train *v = Train::From(((NPFFindStationOrTileData *)as->user_target)->v);
 
 		const PathNode *target = FindSafePosition(&current->path, v);
 		ftd->node = target->node;
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -1119,7 +1119,7 @@
 
 				switch (v->type) {
 					case VEH_ROAD: {
-						RoadVehicle *rv = (RoadVehicle *)v;
+						RoadVehicle *rv = RoadVehicle::From(v);
 						RoadVehicleCache cache = rv->rcache;
 						RoadVehUpdateCache(rv);
 
@@ -1130,7 +1130,7 @@
 
 					case VEH_TRAIN: {
 						uint length = 0;
-						Train *t = (Train *)v;
+						Train *t = Train::From(v);
 						for (Vehicle *u = t; u != NULL; u = u->Next()) length++;
 
 						TrainCache *wagons = MallocT<TrainCache>(length);
@@ -1151,7 +1151,7 @@
 					} break;
 
 					case VEH_AIRCRAFT: {
-						Aircraft *a = (Aircraft *)v;
+						Aircraft *a = Aircraft::From(v);
 						AircraftCache cache = a->acache;
 						UpdateAircraftCache(a);
 
--- a/src/order_cmd.cpp
+++ b/src/order_cmd.cpp
@@ -21,6 +21,7 @@
 #include "settings_type.h"
 #include "core/pool_func.hpp"
 #include "aircraft.h"
+#include "roadveh.h"
 
 #include "table/strings.h"
 
@@ -734,7 +735,7 @@
 	if (flags & DC_EXEC) {
 		v->cur_order_index = sel_ord;
 
-		if (v->type == VEH_ROAD) ClearSlot((RoadVehicle *)v);
+		if (v->type == VEH_ROAD) ClearSlot(RoadVehicle::From(v));
 
 		if (v->current_order.IsType(OT_LOADING)) v->LeaveStation();
 
@@ -1360,7 +1361,7 @@
 		case VEH_TRAIN:     return st->train_tile;
 		case VEH_AIRCRAFT:  return st->airport_tile;
 		case VEH_SHIP:      return st->dock_tile;
-		case VEH_ROAD:      return st->GetPrimaryRoadStop((RoadVehicle *)v)->xy;
+		case VEH_ROAD:      return st->GetPrimaryRoadStop(RoadVehicle::From(v))->xy;
 	}
 }
 
@@ -1615,7 +1616,7 @@
 					if (v->type == VEH_TRAIN && reverse) DoCommand(v->tile, v->index, 0, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
 
 					if (v->type == VEH_AIRCRAFT) {
-						Aircraft *a = (Aircraft *)v;
+						Aircraft *a = Aircraft::From(v);
 						if (a->state == FLYING && a->targetairport != destination) {
 							/* The aircraft is now heading for a different hangar than the next in the orders */
 							extern void AircraftNextAirportPos_and_Order(Aircraft *a);
@@ -1734,13 +1735,13 @@
 		if (v->type == VEH_AIRCRAFT) {
 			/* Aircraft do something vastly different here, so handle separately */
 			extern void HandleMissingAircraftOrders(Aircraft *v);
-			HandleMissingAircraftOrders((Aircraft *)v);
+			HandleMissingAircraftOrders(Aircraft::From(v));
 			return false;
 		}
 
 		v->current_order.Free();
 		v->dest_tile = 0;
-		if (v->type == VEH_ROAD) ClearSlot((RoadVehicle *)v);
+		if (v->type == VEH_ROAD) ClearSlot(RoadVehicle::From(v));
 		return false;
 	}
 
--- a/src/pbs.cpp
+++ b/src/pbs.cpp
@@ -235,7 +235,7 @@
 
 	if (v->type != VEH_TRAIN || (v->vehstatus & VS_CRASHED)) return NULL;
 
-	Train *t = (Train *)v;
+	Train *t = Train::From(v);
 	if (HasBit((TrackBits)t->track, TrackdirToTrack(info->res.trackdir))) {
 		t = t->First();
 
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -92,7 +92,7 @@
 
 	if (v->type != VEH_TRAIN) return NULL;
 
-	Train *t = (Train *)v;
+	Train *t = Train::From(v);
 	if ((t->track != rail_bits) && !TracksOverlap(t->track | rail_bits)) return NULL;
 
 	_error_message = VehicleInTheWayErrMsg(v);
@@ -1235,7 +1235,7 @@
 
 	if (v->type == VEH_TRAIN && !IsArticulatedPart(v)) {
 		const RailVehicleInfo *rvi = RailVehInfo(v->engine_type);
-		if (GetVehicleProperty(v, 0x0B, rvi->power) != 0) TrainPowerChanged((Train *)v->First());
+		if (GetVehicleProperty(v, 0x0B, rvi->power) != 0) TrainPowerChanged(Train::From(v)->First());
 	}
 
 	return NULL;
@@ -2461,7 +2461,7 @@
 	/* this routine applies only to trains in depot tiles */
 	if (u->type != VEH_TRAIN || !IsRailDepotTile(tile)) return VETSB_CONTINUE;
 
-	Train *v = (Train *)u;
+	Train *v = Train::From(u);
 
 	/* depot direction */
 	dir = GetRailDepotDirection(tile);
--- a/src/road_cmd.cpp
+++ b/src/road_cmd.cpp
@@ -1541,7 +1541,7 @@
 		case ROAD_TILE_DEPOT: {
 			if (v->type != VEH_ROAD) break;
 
-			RoadVehicle *rv = (RoadVehicle *)v;
+			RoadVehicle *rv = RoadVehicle::From(v);
 			if (rv->frame == RVC_DEPOT_STOP_FRAME &&
 					_roadveh_enter_depot_dir[GetRoadDepotDirection(tile)] == rv->state) {
 				rv->state = RVSB_IN_DEPOT;
--- a/src/roadveh_cmd.cpp
+++ b/src/roadveh_cmd.cpp
@@ -762,7 +762,7 @@
 
 	if (++front->blocked_ctr > 1480) return NULL;
 
-	return (RoadVehicle *)rvf.best;
+	return RoadVehicle::From(rvf.best);
 }
 
 static void RoadVehArrivesAt(const RoadVehicle *v, Station *st)
--- a/src/roadveh_gui.cpp
+++ b/src/roadveh_gui.cpp
@@ -130,7 +130,7 @@
 	int highlight_w = 0;
 
 	for (int dx = 0; v != NULL && dx < max_length ; v = v->Next()) {
-		int width = ((const RoadVehicle *)v)->rcache.cached_veh_length;
+		int width = RoadVehicle::From(v)->rcache.cached_veh_length;
 
 		if (dx + width > 0 && dx <= max_length) {
 			SpriteID pal = (v->vehstatus & VS_CRASHED) ? PALETTE_CRASH : GetVehiclePalette(v);
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -912,9 +912,9 @@
 				continue;
 			}
 			if (v->type == VEH_TRAIN) {
-				((Train *)v)->track = TRACK_BIT_WORMHOLE;
+				Train::From(v)->track = TRACK_BIT_WORMHOLE;
 			} else {
-				((RoadVehicle *)v)->state = RVSB_WORMHOLE;
+				RoadVehicle::From(v)->state = RVSB_WORMHOLE;
 			}
 		}
 	}
--- a/src/saveload/oldloader_sl.cpp
+++ b/src/saveload/oldloader_sl.cpp
@@ -177,7 +177,7 @@
 
 		/* We haven't used this bit for stations for ages */
 		if (v->type == VEH_ROAD) {
-			RoadVehicle *rv = (RoadVehicle *)v;
+			RoadVehicle *rv = RoadVehicle::From(v);
 			if (rv->state != RVSB_IN_DEPOT && rv->state != RVSB_WORMHOLE) {
 				ClrBit(rv->state, RVS_IS_STOPPING);
 			}
@@ -1316,7 +1316,7 @@
 					};
 					if (v->spritenum / 2 >= lengthof(spriteset_rail)) return false;
 					v->spritenum = spriteset_rail[v->spritenum / 2]; // adjust railway sprite set offset
-					((Train *)v)->railtype = type == 0x25 ? 1 : 0; // monorail / rail
+					Train::From(v)->railtype = type == 0x25 ? 1 : 0; // monorail / rail
 					break;
 				}
 
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -242,8 +242,8 @@
 
 		if (part_of_load) v->fill_percent_te_id = INVALID_TE_ID;
 		v->first = NULL;
-		if (v->type == VEH_TRAIN) ((Train *)v)->tcache.first_engine = INVALID_ENGINE;
-		if (v->type == VEH_ROAD)  ((RoadVehicle *)v)->rcache.first_engine = INVALID_ENGINE;
+		if (v->type == VEH_TRAIN) Train::From(v)->tcache.first_engine = INVALID_ENGINE;
+		if (v->type == VEH_ROAD)  RoadVehicle::From(v)->rcache.first_engine = INVALID_ENGINE;
 
 		v->cargo.InvalidateCache();
 	}
@@ -308,10 +308,10 @@
 		assert(v->first != NULL);
 
 		if (v->type == VEH_TRAIN && (IsFrontEngine(v) || IsFreeWagon(v))) {
-			if (IsFrontEngine(v)) ((Train *)v)->tcache.last_speed = v->cur_speed; // update displayed train speed
-			TrainConsistChanged((Train *)v, false);
+			if (IsFrontEngine(v)) Train::From(v)->tcache.last_speed = v->cur_speed; // update displayed train speed
+			TrainConsistChanged(Train::From(v), false);
 		} else if (v->type == VEH_ROAD && IsRoadVehFront(v)) {
-			RoadVehUpdateCache((RoadVehicle *)v);
+			RoadVehUpdateCache(RoadVehicle::From(v));
 		}
 	}
 
@@ -335,7 +335,7 @@
 	FOR_ALL_VEHICLES(v) {
 		switch (v->type) {
 			case VEH_ROAD: {
-				RoadVehicle *rv = (RoadVehicle *)v;
+				RoadVehicle *rv = RoadVehicle::From(v);
 				rv->roadtype = HasBit(EngInfo(v->First()->engine_type)->misc_flags, EF_ROAD_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
 				rv->compatible_roadtypes = RoadTypeToRoadTypes(rv->roadtype);
 			}
@@ -356,10 +356,10 @@
 					/* In the case of a helicopter we will update the rotor sprites */
 					if (v->subtype == AIR_HELICOPTER) {
 						Vehicle *rotor = shadow->Next();
-						rotor->cur_image = GetRotorImage((Aircraft *)v);
+						rotor->cur_image = GetRotorImage(Aircraft::From(v));
 					}
 
-					UpdateAircraftCache((Aircraft *)v);
+					UpdateAircraftCache(Aircraft::From(v));
 				}
 				break;
 			default: break;
--- a/src/signal.cpp
+++ b/src/signal.cpp
@@ -184,7 +184,7 @@
 /** Check whether there is a train on rail, not in a depot */
 static Vehicle *TrainOnTileEnum(Vehicle *v, void *)
 {
-	if (v->type != VEH_TRAIN || ((Train *)v)->track == TRACK_BIT_DEPOT) return NULL;
+	if (v->type != VEH_TRAIN || Train::From(v)->track == TRACK_BIT_DEPOT) return NULL;
 
 	return v;
 }
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -1488,7 +1488,7 @@
 
 static Vehicle *ClearRoadStopStatusEnum(Vehicle *v, void *)
 {
-	if (v->type == VEH_ROAD) ((RoadVehicle *)v)->state &= RVSB_ROAD_STOP_TRACKDIR_MASK;
+	if (v->type == VEH_ROAD) RoadVehicle::From(v)->state &= RVSB_ROAD_STOP_TRACKDIR_MASK;
 
 	return NULL;
 }
@@ -2617,7 +2617,7 @@
 
 		int station_ahead;
 		int station_length;
-		int stop = GetTrainStopLocation(station_id, tile, (Train *)v, &station_ahead, &station_length);
+		int stop = GetTrainStopLocation(station_id, tile, Train::From(v), &station_ahead, &station_length);
 
 		/* Stop whenever that amount of station ahead + the distance from the
 		 * begin of the platform to the stop location is longer than the length
@@ -2645,7 +2645,7 @@
 			}
 		}
 	} else if (v->type == VEH_ROAD) {
-		RoadVehicle *rv = (RoadVehicle *)v;
+		RoadVehicle *rv = RoadVehicle::From(v);
 		if (rv->state < RVSB_IN_ROAD_STOP && !IsReversingRoadTrackdir((Trackdir)rv->state) && rv->frame == 0) {
 			if (IsRoadStop(tile) && IsRoadVehFront(v)) {
 				/* Attempt to allocate a parking bay in a road stop */
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -1725,7 +1725,7 @@
 
 	TileIndex tile = *(TileIndex*)data;
 
-	if (TrainApproachingCrossingTile((Train *)v) != tile) return NULL;
+	if (TrainApproachingCrossingTile(Train::From(v)) != tile) return NULL;
 
 	return v;
 }
@@ -1800,7 +1800,7 @@
 {
 	Train *base = v;
 	Train *first = base; // first vehicle to move
-	Train *last = (Train *)GetLastVehicleInChain(v); // last vehicle to move
+	Train *last = Train::From(GetLastVehicleInChain(v)); // last vehicle to move
 	uint length = CountVehiclesInChain(v);
 
 	while (length > 2) {
@@ -1849,7 +1849,7 @@
 
 	Train *base = v;
 	Train *first = base; // first vehicle to move
-	Train *last = (Train *)GetLastVehicleInChain(v); // last vehicle to move
+	Train *last = Train::From(GetLastVehicleInChain(v)); // last vehicle to move
 	uint length = CountVehiclesInChain(v);
 
 	/* we have to make sure all wagons that leave a depot because of train reversing are moved coorectly
@@ -3559,7 +3559,7 @@
 	Vehicle *coll = v->First();
 
 	/* can't collide with own wagons && can't crash in depot && the same height level */
-	if (coll != tcc->v && ((Train *)v)->track != TRACK_BIT_DEPOT && abs(v->z_pos - tcc->v->z_pos) < 6) {
+	if (coll != tcc->v && Train::From(v)->track != TRACK_BIT_DEPOT && abs(v->z_pos - tcc->v->z_pos) < 6) {
 		int x_diff = v->x_pos - tcc->v->x_pos;
 		int y_diff = v->y_pos - tcc->v->y_pos;
 
@@ -3567,8 +3567,8 @@
 		if (x_diff * x_diff + y_diff * y_diff > 25) return NULL;
 
 		/* crash both trains */
-		tcc->num += TrainCrashed((Train *)tcc->v);
-		tcc->num += TrainCrashed((Train *)coll);
+		tcc->num += TrainCrashed(Train::From(tcc->v));
+		tcc->num += TrainCrashed(Train::From(coll));
 
 		/* Try to reserve all tiles directly under the crashed trains.
 		 * As there might be more than two trains involved, we have to do that for all vehicles */
@@ -3632,8 +3632,8 @@
 	DiagDirection exitdir = *(DiagDirection *)data;
 
 	/* front engine of a train, not inside wormhole or depot, not crashed */
-	if (v->type == VEH_TRAIN && IsFrontEngine(v) && (((Train *)v)->track & TRACK_BIT_MASK) != 0 && !(v->vehstatus & VS_CRASHED)) {
-		if (v->cur_speed <= 5 && TrainExitDir(v->direction, ((Train *)v)->track) == exitdir) return v;
+	if (v->type == VEH_TRAIN && IsFrontEngine(v) && (Train::From(v)->track & TRACK_BIT_MASK) && !(v->vehstatus & VS_CRASHED)) {
+		if (v->cur_speed <= 5 && TrainExitDir(v->direction, Train::From(v)->track) == exitdir) return v;
 	}
 
 	return NULL;
@@ -3942,11 +3942,11 @@
 	TrackBits *trackbits = (TrackBits *)data;
 
 	if (v->type == VEH_TRAIN && (v->vehstatus & VS_CRASHED) != 0) {
-		if ((((Train *)v)->track & TRACK_BIT_WORMHOLE) == TRACK_BIT_WORMHOLE) {
+		if ((Train::From(v)->track & TRACK_BIT_WORMHOLE) == TRACK_BIT_WORMHOLE) {
 			/* Vehicle is inside a wormhole, v->track contains no useful value then. */
 			*trackbits |= DiagDirToDiagTrackBits(GetTunnelBridgeDirection(v->tile));
 		} else {
-			*trackbits |= ((Train *)v)->track;
+			*trackbits |= Train::From(v)->track;
 		}
 	}
 
--- a/src/train_gui.cpp
+++ b/src/train_gui.cpp
@@ -80,7 +80,7 @@
 	_cur_dpi = &tmp_dpi;
 
 	do {
-		int width = ((const Train *)v)->tcache.cached_veh_length;
+		int width = Train::From(v)->tcache.cached_veh_length;
 
 		if (dx + width > 0) {
 			if (dx <= count) {
@@ -236,7 +236,7 @@
 				do {
 					SpriteID pal = (v->vehstatus & VS_CRASHED) ? PALETTE_CRASH : GetVehiclePalette(v);
 					DrawSprite(u->GetImage(DIR_W), pal, x + WagonLengthToPixels(4 + dx), y + 6 + (is_custom_sprite(RailVehInfo(u->engine_type)->image_index) ? _traininfo_vehicle_pitch : 0));
-					dx += ((const Train *)u)->tcache.cached_veh_length;
+					dx += Train::From(u)->tcache.cached_veh_length;
 					u = u->Next();
 				} while (u != NULL && IsArticulatedPart(u) && u->cargo_cap == 0);
 
--- a/src/tunnelbridge_cmd.cpp
+++ b/src/tunnelbridge_cmd.cpp
@@ -1385,7 +1385,7 @@
 		DiagDirection vdir;
 
 		if (v->type == VEH_TRAIN) {
-			Train *t = (Train *)v;
+			Train *t = Train::From(v);
 			fc = (x & 0xF) + (y << 4);
 
 			vdir = DirToDiagDir(t->direction);
@@ -1414,7 +1414,7 @@
 				return VETSB_ENTERED_WORMHOLE;
 			}
 		} else if (v->type == VEH_ROAD) {
-			RoadVehicle *rv = (RoadVehicle *)v;
+			RoadVehicle *rv = RoadVehicle::From(v);
 			fc = (x & 0xF) + (y << 4);
 			vdir = DirToDiagDir(v->direction);
 
@@ -1464,18 +1464,18 @@
 			}
 			switch (v->type) {
 				case VEH_TRAIN: {
-					Train *t = (Train *)v;
+					Train *t = Train::From(v);
 					t->track = TRACK_BIT_WORMHOLE;
 					ClrBit(t->flags, VRF_GOINGUP);
 					ClrBit(t->flags, VRF_GOINGDOWN);
 				} break;
 
 				case VEH_ROAD:
-					((RoadVehicle *)v)->state = RVSB_WORMHOLE;
+					RoadVehicle::From(v)->state = RVSB_WORMHOLE;
 					break;
 
 				case VEH_SHIP:
-					((Ship *)v)->state = TRACK_BIT_WORMHOLE;
+					Ship::From(v)->state = TRACK_BIT_WORMHOLE;
 					break;
 
 				default: NOT_REACHED();
@@ -1485,7 +1485,7 @@
 			v->tile = tile;
 			switch (v->type) {
 				case VEH_TRAIN: {
-					Train *t = (Train *)v;
+					Train *t = Train::From(v);
 					if (t->track == TRACK_BIT_WORMHOLE) {
 						t->track = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
 						return VETSB_ENTERED_WORMHOLE;
@@ -1493,7 +1493,7 @@
 				} break;
 
 				case VEH_ROAD: {
-					RoadVehicle *rv = (RoadVehicle *)v;
+					RoadVehicle *rv = RoadVehicle::From(v);
 					if (rv->state == RVSB_WORMHOLE) {
 						rv->state = _road_exit_tunnel_state[dir];
 						rv->frame = 0;
@@ -1502,7 +1502,7 @@
 				} break;
 
 				case VEH_SHIP: {
-					Ship *ship = (Ship *)v;
+					Ship *ship = Ship::From(v);
 					if (ship->state == TRACK_BIT_WORMHOLE) {
 						ship->state = (DiagDirToAxis(dir) == AXIS_X ? TRACK_BIT_X : TRACK_BIT_Y);
 						return VETSB_ENTERED_WORMHOLE;
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -524,9 +524,9 @@
 		if (this->IsPrimaryVehicle()) DecreaseGroupNumVehicle(this->group_id);
 	}
 
-	if (this->type == VEH_ROAD) ClearSlot((RoadVehicle *)this);
+	if (this->type == VEH_ROAD) ClearSlot(RoadVehicle::From(this));
 	if (this->type == VEH_AIRCRAFT && this->IsPrimaryVehicle()) {
-		Aircraft *a = (Aircraft *)this;
+		Aircraft *a = Aircraft::From(this);
 		Station *st = GetTargetAirportIfValid(a);
 		if (st != NULL) {
 			const AirportFTA *layout = st->Airport()->layout;
@@ -984,8 +984,8 @@
 			if (!IsFrontEngine(v)) v = v->First();
 			UpdateSignalsOnSegment(v->tile, INVALID_DIAGDIR, v->owner);
 			v->load_unload_time_rem = 0;
-			ClrBit(((Train *)v)->flags, VRF_TOGGLE_REVERSE);
-			TrainConsistChanged((Train *)v, true);
+			ClrBit(Train::From(v)->flags, VRF_TOGGLE_REVERSE);
+			TrainConsistChanged(Train::From(v), true);
 			break;
 
 		case VEH_ROAD:
@@ -995,13 +995,13 @@
 
 		case VEH_SHIP:
 			InvalidateWindowClasses(WC_SHIPS_LIST);
-			static_cast<Ship*>(v)->state = TRACK_BIT_DEPOT;
+			Ship::From(v)->state = TRACK_BIT_DEPOT;
 			RecalcShipStuff(v);
 			break;
 
 		case VEH_AIRCRAFT:
 			InvalidateWindowClasses(WC_AIRCRAFT_LIST);
-			HandleAircraftEnterHangar((Aircraft *)v);
+			HandleAircraftEnterHangar(Aircraft::From(v));
 			break;
 		default: NOT_REACHED();
 	}
@@ -1429,9 +1429,9 @@
 SpriteID GetVehiclePalette(const Vehicle *v)
 {
 	if (v->type == VEH_TRAIN) {
-		return GetEngineColourMap(v->engine_type, v->owner, ((const Train *)v)->tcache.first_engine, v);
+		return GetEngineColourMap(v->engine_type, v->owner, Train::From(v)->tcache.first_engine, v);
 	} else if (v->type == VEH_ROAD) {
-		return GetEngineColourMap(v->engine_type, v->owner, ((const RoadVehicle *)v)->rcache.first_engine, v);
+		return GetEngineColourMap(v->engine_type, v->owner, RoadVehicle::From(v)->rcache.first_engine, v);
 	}
 
 	return GetEngineColourMap(v->engine_type, v->owner, INVALID_ENGINE, v);
@@ -1493,7 +1493,7 @@
 		 * might not be marked as wanting a reservation, e.g.
 		 * when an overlength train gets turned around in a station. */
 		if (UpdateSignalsOnSegment(this->tile, TrackdirToExitdir(this->GetVehicleTrackdir()), this->owner) == SIGSEG_PBS || _settings_game.pf.reserve_paths) {
-			TryPathReserve((Train *)this, true, true);
+			TryPathReserve(Train::From(this), true, true);
 		}
 	}
 }
@@ -1577,7 +1577,7 @@
 		if (this->type == VEH_TRAIN && reverse) DoCommand(this->tile, this->index, 0, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
 
 		if (this->type == VEH_AIRCRAFT) {
-			Aircraft *a = (Aircraft *)this;
+			Aircraft *a = Aircraft::From(this);
 			if (a->state == FLYING && a->targetairport != destination) {
 				/* The aircraft is now heading for a different hangar than the next in the orders */
 				extern void AircraftNextAirportPos_and_Order(Aircraft *a);
@@ -1747,7 +1747,7 @@
  */
 bool CanVehicleUseStation(const Vehicle *v, const Station *st)
 {
-	if (v->type == VEH_ROAD) return st->GetPrimaryRoadStop((const RoadVehicle *)v) != NULL;
+	if (v->type == VEH_ROAD) return st->GetPrimaryRoadStop(RoadVehicle::From(v)) != NULL;
 
 	return CanVehicleUseStation(v->engine_type, st);
 }
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -573,6 +573,28 @@
 	{
 		return IsValidID(index) ? Get(index) : NULL ;
 	}
+
+	/**
+	 * Converts a Vehicle to SpecializedVehicle with type checking.
+	 * @param v Vehicle pointer
+	 * @return pointer to SpecializedVehicle
+	 */
+	static FORCEINLINE T *From(Vehicle *v)
+	{
+		assert(v->type == Type);
+		return (T *)v;
+	}
+
+	/**
+	 * Converts a const Vehicle to const SpecializedVehicle with type checking.
+	 * @param v Vehicle pointer
+	 * @return pointer to SpecializedVehicle
+	 */
+	static FORCEINLINE const T *From(const Vehicle *v)
+	{
+		assert(v->type == Type);
+		return (const T *)v;
+	}
 };
 
 #define FOR_ALL_VEHICLES_OF_TYPE(name, var) FOR_ALL_ITEMS_FROM(name, vehicle_index, var, 0) if (var->type == name::EXPECTED_TYPE)
--- a/src/vehicle_cmd.cpp
+++ b/src/vehicle_cmd.cpp
@@ -67,7 +67,7 @@
 
 	switch (v->type) {
 		case VEH_TRAIN:
-			if ((v->vehstatus & VS_STOPPED) && ((Train *)v)->tcache.cached_power == 0) return_cmd_error(STR_TRAIN_START_NO_CATENARY);
+			if ((v->vehstatus & VS_STOPPED) && Train::From(v)->tcache.cached_power == 0) return_cmd_error(STR_TRAIN_START_NO_CATENARY);
 			break;
 
 		case VEH_SHIP:
@@ -75,7 +75,7 @@
 			break;
 
 		case VEH_AIRCRAFT: {
-			Aircraft *a = (Aircraft *)v;
+			Aircraft *a = Aircraft::From(v);
 			/* cannot stop airplane when in flight, or when taking off / landing */
 			if (a->state >= STARTTAKEOFF && a->state < TERM7) return_cmd_error(STR_ERROR_AIRCRAFT_IS_IN_FLIGHT);
 		} break;
@@ -152,7 +152,7 @@
 
 		if (!vehicle_list_window) {
 			if (vehicle_type == VEH_TRAIN) {
-				if (CheckTrainInDepot((const Train *)v, false) == -1) continue;
+				if (CheckTrainInDepot(Train::From(v), false) == -1) continue;
 			} else {
 				if (!(v->vehstatus & VS_HIDDEN)) continue;
 			}
@@ -349,7 +349,7 @@
 
 	if (!CheckOwnership(v->owner)) return CMD_ERROR;
 
-	if (v->type == VEH_TRAIN && (!IsFrontEngine(v) || ((Train *)v)->crash_anim_pos >= 4400)) return CMD_ERROR;
+	if (v->type == VEH_TRAIN && (!IsFrontEngine(v) || Train::From(v)->crash_anim_pos >= 4400)) return CMD_ERROR;
 
 	/* check that we can allocate enough vehicles */
 	if (!(flags & DC_EXEC)) {
@@ -381,8 +381,8 @@
 		if (flags & DC_EXEC) {
 			w = Vehicle::Get(_new_vehicle_id);
 
-			if (v->type == VEH_TRAIN && HasBit(((Train *)v)->flags, VRF_REVERSE_DIRECTION)) {
-				SetBit(((Train *)w)->flags, VRF_REVERSE_DIRECTION);
+			if (v->type == VEH_TRAIN && HasBit(Train::From(v)->flags, VRF_REVERSE_DIRECTION)) {
+				SetBit(Train::From(w)->flags, VRF_REVERSE_DIRECTION);
 			}
 
 			if (v->type == VEH_TRAIN && !IsFrontEngine(v)) {
@@ -403,7 +403,7 @@
 			}
 			w_rear = w; // trains needs to know the last car in the train, so they can add more in next loop
 		}
-	} while (v->type == VEH_TRAIN && (v = GetNextVehicle((Train *)v)) != NULL);
+	} while (v->type == VEH_TRAIN && (v = GetNextVehicle(Train::From(v))) != NULL);
 
 	if ((flags & DC_EXEC) && v_front->type == VEH_TRAIN) {
 		/* for trains this needs to be the front engine due to the callback function */
@@ -437,7 +437,7 @@
 				}
 
 				if (w->type == VEH_TRAIN && EngineHasArticPart(w)) {
-					w = GetNextArticPart((Train *)w);
+					w = GetNextArticPart(Train::From(w));
 				} else if (w->type == VEH_ROAD && RoadVehHasArticPart(w)) {
 					w = w->Next();
 				} else {
@@ -453,7 +453,7 @@
 			}
 
 			if (v->type == VEH_TRAIN && EngineHasArticPart(v)) {
-				v = GetNextArticPart((Train *)v);
+				v = GetNextArticPart(Train::From(v));
 			} else if (v->type == VEH_ROAD && RoadVehHasArticPart(v)) {
 				v = v->Next();
 			} else {
@@ -461,8 +461,8 @@
 			}
 		} while (v != NULL);
 
-		if ((flags & DC_EXEC) && v->type == VEH_TRAIN) w = GetNextVehicle((Train *)w);
-	} while (v->type == VEH_TRAIN && (v = GetNextVehicle((Train *)v)) != NULL);
+		if ((flags & DC_EXEC) && v->type == VEH_TRAIN) w = GetNextVehicle(Train::From(w));
+	} while (v->type == VEH_TRAIN && (v = GetNextVehicle(Train::From(v))) != NULL);
 
 	if (flags & DC_EXEC) {
 		/*
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -603,7 +603,7 @@
 {
 	int r = 0;
 	if ((*a)->type == VEH_TRAIN && (*b)->type == VEH_TRAIN) {
-		r = ((const Train *)(*a))->tcache.cached_max_speed - ((const Train *)(*b))->tcache.cached_max_speed;
+		r = Train::From(*a)->tcache.cached_max_speed - Train::From(*b)->tcache.cached_max_speed;
 	} else {
 		r = (*a)->max_speed - (*b)->max_speed;
 	}
@@ -636,13 +636,13 @@
 	int r = 0;
 	switch ((*a)->type) {
 		case VEH_TRAIN:
-			r = ((const Train *)(*a))->tcache.cached_total_length - ((const Train *)(*b))->tcache.cached_total_length;
+			r = Train::From(*a)->tcache.cached_total_length - Train::From(*b)->tcache.cached_total_length;
 			break;
 
 		case VEH_ROAD: {
 			const RoadVehicle *u;
-			for (u = (const RoadVehicle *)*a; u != NULL; u = u->Next()) r += u->rcache.cached_veh_length;
-			for (u = (const RoadVehicle *)*b; u != NULL; u = u->Next()) r -= u->rcache.cached_veh_length;
+			for (u = RoadVehicle::From(*a); u != NULL; u = u->Next()) r += u->rcache.cached_veh_length;
+			for (u = RoadVehicle::From(*b); u != NULL; u = u->Next()) r -= u->rcache.cached_veh_length;
 		} break;
 
 		default: NOT_REACHED();
@@ -1471,10 +1471,10 @@
 		switch (v->type) {
 			case VEH_TRAIN:
 				SetDParam(2, v->GetDisplayMaxSpeed());
-				SetDParam(1, ((const Train *)v)->tcache.cached_power);
-				SetDParam(0, ((const Train *)v)->tcache.cached_weight);
-				SetDParam(3, ((const Train *)v)->tcache.cached_max_te / 1000);
-				DrawString(2, this->width - 2, 25, (_settings_game.vehicle.train_acceleration_model != TAM_ORIGINAL && ((const Train *)v)->railtype != RAILTYPE_MAGLEV) ?
+				SetDParam(1, Train::From(v)->tcache.cached_power);
+				SetDParam(0, Train::From(v)->tcache.cached_weight);
+				SetDParam(3, Train::From(v)->tcache.cached_max_te / 1000);
+				DrawString(2, this->width - 2, 25, (_settings_game.vehicle.train_acceleration_model != TAM_ORIGINAL && Train::From(v)->railtype != RAILTYPE_MAGLEV) ?
 					STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED_MAX_TE :
 					STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED);
 				break;
@@ -1943,7 +1943,7 @@
 		} else if (v->vehstatus & VS_STOPPED) {
 			if (v->type == VEH_TRAIN) {
 				if (v->cur_speed == 0) {
-					if (((const Train *)v)->tcache.cached_power == 0) {
+					if (Train::From(v)->tcache.cached_power == 0) {
 						str = STR_TRAIN_NO_POWER;
 					} else {
 						str = STR_VEHICLE_STATUS_STOPPED;
@@ -1955,7 +1955,7 @@
 			} else { // no train
 				str = STR_VEHICLE_STATUS_STOPPED;
 			}
-		} else if (v->type == VEH_TRAIN && HasBit(((const Train *)v)->flags, VRF_TRAIN_STUCK)) {
+		} else if (v->type == VEH_TRAIN && HasBit(Train::From(v)->flags, VRF_TRAIN_STUCK)) {
 			str = STR_TRAIN_STUCK;
 		} else { // vehicle is in a "normal" state, show current order
 			switch (v->current_order.GetType()) {
--- a/src/vehicle_type.h
+++ b/src/vehicle_type.h
@@ -28,6 +28,8 @@
 struct RoadVehicle;
 struct Ship;
 struct Aircraft;
+struct EffectVehicle;
+struct DisasterVehicle;
 
 struct BaseVehicle
 {
--- a/src/vehiclelist.cpp
+++ b/src/vehiclelist.cpp
@@ -29,7 +29,7 @@
 		switch (type) {
 			case VEH_TRAIN:
 				if (IsArticulatedPart(v) || IsRearDualheaded(v)) continue;
-				if (((const Train *)v)->track != TRACK_BIT_DEPOT) continue;
+				if (Train::From(v)->track != TRACK_BIT_DEPOT) continue;
 				if (wagons != NULL && IsFreeWagon(v->First())) {
 					if (individual_wagons || IsFreeWagon(v)) *wagons->Append() = v;
 					continue;
--- a/src/water_cmd.cpp
+++ b/src/water_cmd.cpp
@@ -813,22 +813,22 @@
 						/* FreeTrainTrackReservation() calls GetVehicleTrackdir() that doesn't like crashed vehicles.
 						 * In this case, v->direction matches v->u.rail.track, so we can do this (it wasn't crashed before) */
 						v->vehstatus &= ~VS_CRASHED;
-						FreeTrainTrackReservation((Train *)v);
+						FreeTrainTrackReservation(Train::From(v));
 						v->vehstatus |= VS_CRASHED;
 					}
-					((Train *)v)->crash_anim_pos = 4000; // max 4440, disappear pretty fast
+					Train::From(v)->crash_anim_pos = 4000; // max 4440, disappear pretty fast
 					InvalidateWindowClassesData(WC_TRAINS_LIST, 0);
 					break;
 
 				case VEH_ROAD:
 					if (IsRoadVehFront(v)) pass += 1; // driver
-					((RoadVehicle *)v)->crashed_ctr = 2000; // max 2220, disappear pretty fast
+					RoadVehicle::From(v)->crashed_ctr = 2000; // max 2220, disappear pretty fast
 					InvalidateWindowClassesData(WC_ROADVEH_LIST, 0);
 					break;
 
 				case VEH_AIRCRAFT:
 					pass += 2; // driver
-					((Aircraft *)v)->crashed_counter = 9000; // max 10000, disappear pretty fast
+					Aircraft::From(v)->crashed_counter = 9000; // max 10000, disappear pretty fast
 					InvalidateWindowClassesData(WC_AIRCRAFT_LIST, 0);
 					break;
 			}
--- a/src/yapf/follow_track.hpp
+++ b/src/yapf/follow_track.hpp
@@ -55,7 +55,7 @@
 	{
 		assert(!IsRailTT() || (v != NULL && v->type == VEH_TRAIN));
 		m_veh = v;
-		Init(v != NULL ? v->owner : INVALID_OWNER, IsRailTT() && railtype_override == INVALID_RAILTYPES ? ((const Train *)v)->compatible_railtypes : railtype_override, pPerf);
+		Init(v != NULL ? v->owner : INVALID_OWNER, IsRailTT() && railtype_override == INVALID_RAILTYPES ? Train::From(v)->compatible_railtypes : railtype_override, pPerf);
 	}
 
 	FORCEINLINE void Init(Owner o, RailTypes railtype_override, CPerformanceTimer *pPerf)
@@ -76,7 +76,7 @@
 	FORCEINLINE static TransportType TT() {return Ttr_type_;}
 	FORCEINLINE static bool IsWaterTT() {return TT() == TRANSPORT_WATER;}
 	FORCEINLINE static bool IsRailTT() {return TT() == TRANSPORT_RAIL;}
-	FORCEINLINE bool IsTram() {return IsRoadTT() && HasBit(((const RoadVehicle *)m_veh)->compatible_roadtypes, ROADTYPE_TRAM);}
+	FORCEINLINE bool IsTram() {return IsRoadTT() && HasBit(RoadVehicle::From(m_veh)->compatible_roadtypes, ROADTYPE_TRAM);}
 	FORCEINLINE static bool IsRoadTT() {return TT() == TRANSPORT_ROAD;}
 	FORCEINLINE static bool Allow90degTurns() {return T90deg_turns_allowed_;}
 	FORCEINLINE static bool DoTrackMasking() {return IsRailTT() && Tmask_reserved_tracks;}
@@ -106,7 +106,7 @@
 		m_old_tile = old_tile;
 		m_old_td = old_td;
 		m_err = EC_NONE;
-		assert(((TrackStatusToTrackdirBits(GetTileTrackStatus(m_old_tile, TT(), IsRoadTT() && m_veh != NULL ? ((const RoadVehicle *)m_veh)->compatible_roadtypes : 0)) & TrackdirToTrackdirBits(m_old_td)) != 0) ||
+		assert(((TrackStatusToTrackdirBits(GetTileTrackStatus(m_old_tile, TT(), IsRoadTT() && m_veh != NULL ? RoadVehicle::From(m_veh)->compatible_roadtypes : 0)) & TrackdirToTrackdirBits(m_old_td)) != 0) ||
 		       (IsTram() && GetSingleTramBit(m_old_tile) != INVALID_DIAGDIR)); // Disable the assertion for single tram bits
 		m_exitdir = TrackdirToExitdir(m_old_td);
 		if (ForcedReverse()) return true;
@@ -207,7 +207,7 @@
 		if (IsRailTT() && IsPlainRailTile(m_new_tile)) {
 			m_new_td_bits = (TrackdirBits)(GetTrackBits(m_new_tile) * 0x101);
 		} else {
-			m_new_td_bits = TrackStatusToTrackdirBits(GetTileTrackStatus(m_new_tile, TT(), IsRoadTT() && m_veh != NULL ? ((const RoadVehicle *)m_veh)->compatible_roadtypes : 0));
+			m_new_td_bits = TrackStatusToTrackdirBits(GetTileTrackStatus(m_new_tile, TT(), IsRoadTT() && m_veh != NULL ? RoadVehicle::From(m_veh)->compatible_roadtypes : 0));
 
 			if (IsTram() && m_new_td_bits == 0) {
 				/* GetTileTrackStatus() returns 0 for single tram bits.
--- a/src/yapf/yapf_costrail.hpp
+++ b/src/yapf/yapf_costrail.hpp
@@ -247,8 +247,8 @@
 		const Vehicle *v = Yapf().GetVehicle();
 		assert(v != NULL);
 		assert(v->type == VEH_TRAIN);
-		assert(((const Train *)v)->tcache.cached_total_length != 0);
-		int missing_platform_length = (((const Train *)v)->tcache.cached_total_length + TILE_SIZE - 1) / TILE_SIZE - platform_length;
+		assert(Train::From(v)->tcache.cached_total_length != 0);
+		int missing_platform_length = (Train::From(v)->tcache.cached_total_length + TILE_SIZE - 1) / TILE_SIZE - platform_length;
 		if (missing_platform_length < 0) {
 			/* apply penalty for longer platform than needed */
 			cost += Yapf().PfGetSettings().rail_longer_platform_penalty + Yapf().PfGetSettings().rail_longer_platform_per_tile_penalty * -missing_platform_length;
--- a/src/yapf/yapf_destrail.hpp
+++ b/src/yapf/yapf_destrail.hpp
@@ -13,8 +13,8 @@
 public:
 	void SetDestination(const Vehicle *v, bool override_rail_type = false)
 	{
-		m_compatible_railtypes = ((const Train *)v)->compatible_railtypes;
-		if (override_rail_type) m_compatible_railtypes |= GetRailTypeInfo(((const Train *)v)->railtype)->compatible_railtypes;
+		m_compatible_railtypes = Train::From(v)->compatible_railtypes;
+		if (override_rail_type) m_compatible_railtypes |= GetRailTypeInfo(Train::From(v)->railtype)->compatible_railtypes;
 	}
 
 	bool IsCompatibleRailType(RailType rt)
@@ -91,8 +91,8 @@
 	FORCEINLINE bool PfDetectDestination(TileIndex tile, Trackdir td)
 	{
 		return
-			IsSafeWaitingPosition((const Train *)Yapf().GetVehicle(), tile, td, true, !TrackFollower::Allow90degTurns()) &&
-			IsWaitingPositionFree((const Train *)Yapf().GetVehicle(), tile, td, !TrackFollower::Allow90degTurns());
+			IsSafeWaitingPosition(Train::From(Yapf().GetVehicle()), tile, td, true, !TrackFollower::Allow90degTurns()) &&
+			IsWaitingPositionFree(Train::From(Yapf().GetVehicle()), tile, td, !TrackFollower::Allow90degTurns());
 	}
 
 	/** Called by YAPF to calculate cost estimate. Calculates distance to the destination
--- a/src/yapf/yapf_rail.cpp
+++ b/src/yapf/yapf_rail.cpp
@@ -54,7 +54,7 @@
 
 	bool FindSafePositionProc(TileIndex tile, Trackdir td)
 	{
-		if (IsSafeWaitingPosition((const Train *)Yapf().GetVehicle(), tile, td, true, !TrackFollower::Allow90degTurns())) {
+		if (IsSafeWaitingPosition(Train::From(Yapf().GetVehicle()), tile, td, true, !TrackFollower::Allow90degTurns())) {
 			m_res_dest = tile;
 			m_res_dest_td = td;
 			return false;   // Stop iterating segment
@@ -149,7 +149,7 @@
 		}
 
 		/* Don't bother if the target is reserved. */
-		if (!IsWaitingPositionFree((const Train *)Yapf().GetVehicle(), m_res_dest, m_res_dest_td)) return false;
+		if (!IsWaitingPositionFree(Train::From(Yapf().GetVehicle()), m_res_dest, m_res_dest_td)) return false;
 
 		for (Node *node = m_res_node; node->m_parent != NULL; node = node->m_parent) {
 			node->IterateTiles(Yapf().GetVehicle(), Yapf(), *this, &CYapfReserveTrack<Types>::ReserveSingleTrack);
@@ -411,7 +411,7 @@
 		if (target != NULL) target->tile = INVALID_TILE;
 
 		/* set origin and destination nodes */
-		PBSTileInfo origin = FollowTrainReservation((const Train *)v);
+		PBSTileInfo origin = FollowTrainReservation(Train::From(v));
 		Yapf().SetOrigin(origin.tile, origin.trackdir, INVALID_TILE, INVALID_TRACKDIR, 1, true);
 		Yapf().SetDestination(v);
 
@@ -536,9 +536,9 @@
 
 bool YapfCheckReverseTrain(const Vehicle *vt)
 {
-	const Train *v = (const Train *)vt;
+	const Train *v = Train::From(vt);
 	/* last wagon */
-	const Train *last_veh = (const Train *)GetLastVehicleInChain(v);
+	const Train *last_veh = Train::From(GetLastVehicleInChain(v));
 
 	/* get trackdirs of both ends */
 	Trackdir td = v->GetVehicleTrackdir();
@@ -602,7 +602,7 @@
 
 	const Vehicle *last_veh = GetLastVehicleInChain(v);
 
-	PBSTileInfo origin = FollowTrainReservation((const Train *)v);
+	PBSTileInfo origin = FollowTrainReservation(Train::From(v));
 	TileIndex last_tile = last_veh->tile;
 	Trackdir td_rev = ReverseTrackdir(last_veh->GetVehicleTrackdir());
 
--- a/src/yapf/yapf_road.cpp
+++ b/src/yapf/yapf_road.cpp
@@ -299,13 +299,13 @@
 		/* our source tile will be the next vehicle tile (should be the given one) */
 		TileIndex src_tile = tile;
 		/* get available trackdirs on the start tile */
-		TrackdirBits src_trackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, ((const RoadVehicle *)v)->compatible_roadtypes));
+		TrackdirBits src_trackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, RoadVehicle::From(v)->compatible_roadtypes));
 		/* select reachable trackdirs only */
 		src_trackdirs &= DiagdirReachesTrackdirs(enterdir);
 
 		/* get available trackdirs on the destination tile */
 		TileIndex dest_tile = v->dest_tile;
-		TrackdirBits dest_trackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(dest_tile, TRANSPORT_ROAD, ((const RoadVehicle *)v)->compatible_roadtypes));
+		TrackdirBits dest_trackdirs = TrackStatusToTrackdirBits(GetTileTrackStatus(dest_tile, TRANSPORT_ROAD, RoadVehicle::From(v)->compatible_roadtypes));
 
 		/* set origin and destination nodes */
 		Yapf().SetOrigin(src_tile, src_trackdirs);
@@ -349,7 +349,7 @@
 
 		/* set destination tile, trackdir
 		 *   get available trackdirs on the destination tile */
-		TrackdirBits dst_td_bits = TrackStatusToTrackdirBits(GetTileTrackStatus(dst_tile, TRANSPORT_ROAD, ((const RoadVehicle *)v)->compatible_roadtypes));
+		TrackdirBits dst_td_bits = TrackStatusToTrackdirBits(GetTileTrackStatus(dst_tile, TRANSPORT_ROAD, RoadVehicle::From(v)->compatible_roadtypes));
 		Yapf().SetDestination(dst_tile, dst_td_bits);
 
 		/* if path not found - return distance = UINT_MAX */
@@ -374,7 +374,7 @@
 		/* set origin (tile, trackdir) */
 		TileIndex src_tile = v->tile;
 		Trackdir src_td = v->GetVehicleTrackdir();
-		if ((TrackStatusToTrackdirBits(GetTileTrackStatus(src_tile, TRANSPORT_ROAD, ((const RoadVehicle *)v)->compatible_roadtypes)) & TrackdirToTrackdirBits(src_td)) == 0) {
+		if ((TrackStatusToTrackdirBits(GetTileTrackStatus(src_tile, TRANSPORT_ROAD, RoadVehicle::From(v)->compatible_roadtypes)) & TrackdirToTrackdirBits(src_td)) == 0) {
 			/* sometimes the roadveh is not on the road (it resides on non-existing track)
 			 * how should we handle that situation? */
 			return false;
@@ -471,7 +471,7 @@
 {
 	TileIndex tile = v->tile;
 	Trackdir trackdir = v->GetVehicleTrackdir();
-	if ((TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, ((const RoadVehicle *)v)->compatible_roadtypes)) & TrackdirToTrackdirBits(trackdir)) == 0) {
+	if ((TrackStatusToTrackdirBits(GetTileTrackStatus(tile, TRANSPORT_ROAD, RoadVehicle::From(v)->compatible_roadtypes)) & TrackdirToTrackdirBits(trackdir)) == 0) {
 		return NULL;
 	}