--- a/src/cargopacket.cpp
+++ b/src/cargopacket.cpp
@@ -73,7 +73,7 @@
 {
 	CargoPacket *cp;
 	FOR_ALL_CARGOPACKETS(cp) {
-		if (cp->source == sid) cp->source_id = INVALID_SOURCE;
+		if (cp->source == sid) cp->source = INVALID_STATION;
 	}
 }
 
@@ -86,9 +86,8 @@
 template <class Tinst>
 CargoList<Tinst>::~CargoList()
 {
-	while (!this->packets.empty()) {
-		delete this->packets.front();
-		this->packets.pop_front();
+	for (Iterator it(this->packets.begin()); it != this->packets.end(); ++it) {
+		delete *it;
 	}
 }
 
@@ -111,7 +110,7 @@
 {
 	assert(cp != NULL);
 
-	for (List::iterator it = this->packets.begin(); it != this->packets.end(); it++) {
+	for (Iterator it(this->packets.begin()); it != this->packets.end(); it++) {
 		CargoPacket *icp = *it;
 		if (Tinst::AreMergable(icp, cp) && icp->count + cp->count <= CargoPacket::MAX_COUNT) {
 			icp->count        += cp->count;
@@ -132,11 +131,11 @@
 template <class Tinst>
 void CargoList<Tinst>::Truncate(uint max_remaining)
 {
-	for (List::iterator it = packets.begin(); it != packets.end(); /* done during loop*/) {
+	for (Iterator it(packets.begin()); it != packets.end(); /* done during loop*/) {
 		CargoPacket *cp = *it;
 		if (max_remaining == 0) {
 			/* Nothing should remain, just remove the packets. */
-			packets.erase(it++);
+			this->packets.erase(it++);
 			static_cast<Tinst *>(this)->RemoveFromCache(cp);
 			delete cp;
 			continue;
@@ -163,8 +162,8 @@
 	assert(mta == MTA_FINAL_DELIVERY || dest != NULL);
 	assert(mta == MTA_UNLOAD || mta == MTA_CARGO_LOAD || payment != NULL);
 
-	List::iterator it = packets.begin();
-	while (it != packets.end() && max_move > 0) {
+	Iterator it(this->packets.begin());
+	while (it != this->packets.end() && max_move > 0) {
 		CargoPacket *cp = *it;
 		if (cp->source == data && mta == MTA_FINAL_DELIVERY) {
 			/* Skip cargo that originated from this station. */
@@ -241,7 +240,7 @@
 	this->count = 0;
 	this->cargo_days_in_transit = 0;
 
-	for (List::const_iterator it = this->packets.begin(); it != this->packets.end(); it++) {
+	for (ConstIterator it(this->packets.begin()); it != this->packets.end(); it++) {
 		static_cast<Tinst *>(this)->AddToCache(*it);
 	}
 }
@@ -261,12 +260,13 @@
 
 void VehicleCargoList::AgeCargo()
 {
-	for (List::const_iterator it = this->packets.begin(); it != this->packets.end(); it++) {
+	for (ConstIterator it(this->packets.begin()); it != this->packets.end(); it++) {
+		CargoPacket *cp = *it;
 		/* If we're at the maximum, then we can't increase no more. */
-		if ((*it)->days_in_transit == 0xFF) continue;
+		if (cp->days_in_transit == 0xFF) continue;
 
-		(*it)->days_in_transit++;
-		this->cargo_days_in_transit += (*it)->count;
+		cp->days_in_transit++;
+		this->cargo_days_in_transit += cp->count;
 	}
 }
 

--- a/src/cargopacket.h
+++ b/src/cargopacket.h
@@ -185,8 +185,12 @@
 template <class Tinst>
 class CargoList {
 public:
-	/** List of cargo packets */
+	/** Container with cargo packets */
 	typedef std::list<CargoPacket *> List;
+	/** The iterator for our container */
+	typedef List::iterator Iterator;
+	/** The const iterator for our container */
+	typedef List::const_iterator ConstIterator;
 
 	/** Kind of actions that could be done with packets on move */
 	enum MoveToAction {

--- a/src/saveload/cargopacket_sl.cpp
+++ b/src/saveload/cargopacket_sl.cpp
@@ -28,7 +28,7 @@
 			*/
 		FOR_ALL_VEHICLES(v) {
 			const VehicleCargoList::List *packets = v->cargo.Packets();
-			for (VehicleCargoList::List::const_iterator it = packets->begin(); it != packets->end(); it++) {
+			for (VehicleCargoList::ConstIterator it(packets->begin()); it != packets->end(); it++) {
 				CargoPacket *cp = *it;
 				cp->source_xy = Station::IsValidID(cp->source) ? Station::Get(cp->source)->xy : v->tile;
 				cp->loaded_at_xy = cp->source_xy;
@@ -47,7 +47,7 @@
 				GoodsEntry *ge = &st->goods[c];
 
 				const StationCargoList::List *packets = ge->cargo.Packets();
-				for (StationCargoList::List::const_iterator it = packets->begin(); it != packets->end(); it++) {
+				for (StationCargoList::ConstIterator it(packets->begin()); it != packets->end(); it++) {
 					CargoPacket *cp = *it;
 					cp->source_xy = Station::IsValidID(cp->source) ? Station::Get(cp->source)->xy : st->xy;
 					cp->loaded_at_xy = cp->source_xy;

--- a/src/station_gui.cpp
+++ b/src/station_gui.cpp
@@ -825,7 +825,7 @@
 
 				/* Add an entry for each distinct cargo source. */
 				const StationCargoList::List *packets = st->goods[i].cargo.Packets();
-				for (StationCargoList::List::const_iterator it = packets->begin(); it != packets->end(); it++) {
+				for (StationCargoList::ConstIterator it(packets->begin()); it != packets->end(); it++) {
 					const CargoPacket *cp = *it;
 					if (cp->SourceStation() != station_id) {
 						bool added = false;
@@ -837,7 +837,7 @@
 						if (!HasBit(this->cargo, i)) break;
 
 						/* Check if we already have this source in the list */
-						for (CargoDataList::iterator jt = cargolist.begin(); jt != cargolist.end(); jt++) {
+						for (CargoDataList::iterator jt(cargolist.begin()); jt != cargolist.end(); jt++) {
 							CargoData *cd = &(*jt);
 							if (cd->cargo == i && cd->source == cp->SourceStation()) {
 								cd->count += cp->Count();