diff --git a/src/ai/ai_gui.cpp b/src/ai/ai_gui.cpp
index 8944e8bc4f..a0720e2ea5 100644
--- a/src/ai/ai_gui.cpp
+++ b/src/ai/ai_gui.cpp
@@ -28,6 +28,7 @@
 #include "../widgets/dropdown_type.h"
 #include "../widgets/dropdown_func.h"
 #include "../hotkeys.h"
+#include "../core/geometry_func.hpp"
 
 #include "ai.hpp"
 #include "ai_gui.hpp"
@@ -766,6 +767,22 @@ struct AIConfigWindow : public Window {
 				this->line_height = FONT_HEIGHT_NORMAL + WD_MATRIX_TOP + WD_MATRIX_BOTTOM;
 				size->height = 8 * this->line_height;
 				break;
+
+			case WID_AIC_CHANGE: {
+				SetDParam(0, STR_AI_CONFIG_CHANGE_GAMESCRIPT);
+				Dimension dim = GetStringBoundingBox(STR_AI_CONFIG_CHANGE);
+
+				SetDParam(0, STR_AI_CONFIG_CHANGE_NONE);
+				dim = maxdim(dim, GetStringBoundingBox(STR_AI_CONFIG_CHANGE));
+
+				SetDParam(0, STR_AI_CONFIG_CHANGE_AI);
+				dim = maxdim(dim, GetStringBoundingBox(STR_AI_CONFIG_CHANGE));
+
+				dim.width += padding.width;
+				dim.height += padding.height;
+				*size = maxdim(*size, dim);
+				break;
+			}
 		}
 	}
 
diff --git a/src/articulated_vehicles.cpp b/src/articulated_vehicles.cpp
index 193c5ac4a8..8c372e7eae 100644
--- a/src/articulated_vehicles.cpp
+++ b/src/articulated_vehicles.cpp
@@ -433,6 +433,7 @@ void AddArticulatedParts(Vehicle *first)
 		v->x_pos = first->x_pos;
 		v->y_pos = first->y_pos;
 		v->z_pos = first->z_pos;
+		v->date_of_last_service = first->date_of_last_service;
 		v->build_year = first->build_year;
 		v->vehstatus = first->vehstatus & ~VS_STOPPED;
 
diff --git a/src/depot_gui.cpp b/src/depot_gui.cpp
index 4aff4700b3..24a14b8334 100644
--- a/src/depot_gui.cpp
+++ b/src/depot_gui.cpp
@@ -663,7 +663,8 @@ struct DepotWindow : Window {
 			DepotSortList(&this->vehicle_list);
 
 			uint new_unitnumber_digits = GetUnitNumberDigits(this->vehicle_list);
-			if (this->unitnumber_digits != new_unitnumber_digits) {
+			/* Only increase the size; do not decrease to prevent constant changes */
+			if (this->unitnumber_digits < new_unitnumber_digits) {
 				this->unitnumber_digits = new_unitnumber_digits;
 				this->ReInit();
 			}
diff --git a/src/economy.cpp b/src/economy.cpp
index d78d2cccec..cdfa059e86 100644
--- a/src/economy.cpp
+++ b/src/economy.cpp
@@ -1317,7 +1317,8 @@ static uint GetLoadAmount(Vehicle *v)
 	/* Scale load amount the same as capacity */
 	if (HasBit(e->info.misc_flags, EF_NO_DEFAULT_CARGO_MULTIPLIER) && !air_mail) load_amount = CeilDiv(load_amount * CargoSpec::Get(v->cargo_type)->multiplier, 0x100);
 
-	return load_amount;
+	/* Zero load amount breaks a lot of things. */
+	return max(1u, load_amount);
 }
 
 /**
@@ -1651,6 +1652,7 @@ static void LoadUnloadVehicle(Vehicle *front)
 			uint amount_unloaded = _settings_game.order.gradual_loading ? min(cargo_count, load_amount) : cargo_count;
 			bool remaining = false; // Are there cargo entities in this vehicle that can still be unloaded here?
 
+			assert(payment != NULL);
 			payment->SetCargo(v->cargo_type);
 
 			if (!HasBit(ge->status, GoodsEntry::GES_ACCEPTANCE) && v->cargo.ActionCount(VehicleCargoList::MTA_DELIVER) > 0) {
diff --git a/src/pathfinder/yapf/yapf_road.cpp b/src/pathfinder/yapf/yapf_road.cpp
index 4c26d7b095..380b641da7 100644
--- a/src/pathfinder/yapf/yapf_road.cpp
+++ b/src/pathfinder/yapf/yapf_road.cpp
@@ -430,29 +430,34 @@ public:
 		return true;
 	}
 
-	static bool stFindNearestDepot(const RoadVehicle *v, TileIndex tile, Trackdir td, int max_distance, TileIndex *depot_tile)
+	static FindDepotData stFindNearestDepot(const RoadVehicle *v, TileIndex tile, Trackdir td, int max_distance)
 	{
 		Tpf pf;
-		return pf.FindNearestDepot(v, tile, td, max_distance, depot_tile);
+		return pf.FindNearestDepot(v, tile, td, max_distance);
 	}
 
-	inline bool FindNearestDepot(const RoadVehicle *v, TileIndex tile, Trackdir td, int max_distance, TileIndex *depot_tile)
+	/**
+	 * Find the best depot for a road vehicle.
+	 * @param v Vehicle
+	 * @param tile Tile of the vehicle.
+	 * @param td Trackdir of the vehicle.
+	 * @param max_distance max length (penalty) for paths.
+	 * @todo max_distance not used by YAPF for road vehicles.
+	 *       It can be removed or copy the SetMaxCost() strategy
+	 *       applied in YAPF for rail. The best depot can be at
+	 *       a distance greater than max_distance.
+	 */
+	inline FindDepotData FindNearestDepot(const RoadVehicle *v, TileIndex tile, Trackdir td, int max_distance)
 	{
-		/* set origin and destination nodes */
+		/* Set origin. */
 		Yapf().SetOrigin(tile, TrackdirToTrackdirBits(td));
 
-		/* find the best path */
-		bool bFound = Yapf().FindPath(v);
-		if (!bFound) return false;
+		/* Find the best path and return if no depot is found. */
+		if (!Yapf().FindPath(v)) return FindDepotData();
 
-		/* some path found
-		 * get found depot tile */
+		/* Return the cost of the best path and its depot. */
 		Node *n = Yapf().GetBestNode();
-
-		if (max_distance > 0 && n->m_cost > max_distance * YAPF_TILE_LENGTH) return false;
-
-		*depot_tile = n->m_segment_last_tile;
-		return true;
+		return FindDepotData(n->m_segment_last_tile, n->m_cost);
 	}
 };
 
@@ -504,7 +509,7 @@ FindDepotData YapfRoadVehicleFindNearestDepot(const RoadVehicle *v, int max_dist
 	}
 
 	/* default is YAPF type 2 */
-	typedef bool (*PfnFindNearestDepot)(const RoadVehicle*, TileIndex, Trackdir, int, TileIndex*);
+	typedef FindDepotData (*PfnFindNearestDepot)(const RoadVehicle*, TileIndex, Trackdir, int);
 	PfnFindNearestDepot pfnFindNearestDepot = &CYapfRoadAnyDepot2::stFindNearestDepot;
 
 	/* check if non-default YAPF type should be used */
@@ -512,8 +517,5 @@ FindDepotData YapfRoadVehicleFindNearestDepot(const RoadVehicle *v, int max_dist
 		pfnFindNearestDepot = &CYapfRoadAnyDepot1::stFindNearestDepot; // Trackdir, allow 90-deg
 	}
 
-	FindDepotData fdd;
-	bool ret = pfnFindNearestDepot(v, tile, trackdir, max_distance, &fdd.tile);
-	fdd.best_length = ret ? max_distance / 2 : UINT_MAX; // some fake distance or NOT_FOUND
-	return fdd;
+	return pfnFindNearestDepot(v, tile, trackdir, max_distance);
 }
diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
index 6f2feeaab7..dca456d976 100644
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -636,6 +636,7 @@ static CommandCost CmdBuildRailWagon(TileIndex tile, DoCommandFlag flags, const
 
 		v->railtype = rvi->railtype;
 
+		v->date_of_last_service = _date;
 		v->build_year = _cur_year;
 		v->cur_image = SPR_IMG_QUERY;
 		v->random_bits = VehicleRandomBits();
@@ -703,6 +704,7 @@ static void AddRearEngineToMultiheadedTrain(Train *v)
 	u->refit_cap = v->refit_cap;
 	u->railtype = v->railtype;
 	u->engine_type = v->engine_type;
+	u->date_of_last_service = v->date_of_last_service;
 	u->build_year = v->build_year;
 	u->cur_image = SPR_IMG_QUERY;
 	u->random_bits = VehicleRandomBits();
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index a482520f25..da2cfeb807 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -216,7 +216,7 @@ uint Vehicle::Crash(bool flooded)
 	SetWindowDirty(WC_VEHICLE_DEPOT, this->tile);
 
 	delete this->cargo_payment;
-	this->cargo_payment = NULL;
+	assert(this->cargo_payment == NULL); // cleared by ~CargoPayment
 
 	return RandomRange(pass + 1); // Randomise deceased passengers.
 }
@@ -746,6 +746,7 @@ void Vehicle::PreDestructor()
 		HideFillingPercent(&this->fill_percent_te_id);
 		this->CancelReservation(INVALID_STATION, st);
 		delete this->cargo_payment;
+		assert(this->cargo_payment == NULL); // cleared by ~CargoPayment
 	}
 
 	if (this->IsEngineCountable()) {
@@ -2085,6 +2086,7 @@ void Vehicle::LeaveStation()
 	assert(this->current_order.IsType(OT_LOADING));
 
 	delete this->cargo_payment;
+	assert(this->cargo_payment == NULL); // cleared by ~CargoPayment
 
 	/* Only update the timetable if the vehicle was supposed to stop here. */
 	if (this->current_order.GetNonStopType() != ONSF_STOP_EVERYWHERE) UpdateVehicleTimetable(this, false);