diff --git a/CMakeLists.txt b/CMakeLists.txt
index f4a39072c5..68e634476a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -166,8 +166,8 @@ check_ipo_supported(RESULT IPO_FOUND)
 show_options()
 
 if(UNIX AND NOT APPLE AND NOT OPTION_DEDICATED)
-    if(NOT SDL_FOUND AND NOT SDL2_FOUND)
-        message(FATAL_ERROR "SDL or SDL2 is required for this platform")
+    if(NOT SDL_FOUND AND NOT SDL2_FOUND AND NOT ALLEGRO_FOUND)
+        message(FATAL_ERROR "SDL, SDL2 or Allegro is required for this platform")
     endif()
 endif()
 if(APPLE)
diff --git a/src/depot_gui.cpp b/src/depot_gui.cpp
index fe41c76e3c..f5ca6f1afd 100644
--- a/src/depot_gui.cpp
+++ b/src/depot_gui.cpp
@@ -296,7 +296,7 @@ struct DepotWindow : Window {
 	~DepotWindow()
 	{
 		DeleteWindowById(WC_BUILD_VEHICLE, this->window_number);
-		DeleteWindowById(GetWindowClassForVehicleType(this->type), VehicleListIdentifier(VL_DEPOT_LIST, this->type, this->owner, GetDepotIndex(this->window_number)).Pack(), false);
+		DeleteWindowById(GetWindowClassForVehicleType(this->type), VehicleListIdentifier(VL_DEPOT_LIST, this->type, this->owner, this->GetDepotIndex()).Pack(), false);
 		OrderBackup::Reset(this->window_number);
 	}
 
@@ -426,10 +426,8 @@ struct DepotWindow : Window {
 	{
 		if (widget != WID_D_CAPTION) return;
 
-		/* locate the depot struct */
-		TileIndex tile = this->window_number;
 		SetDParam(0, this->type);
-		SetDParam(1, (this->type == VEH_AIRCRAFT) ? GetStationIndex(tile) : GetDepotIndex(tile));
+		SetDParam(1, this->GetDepotIndex());
 	}
 
 	struct GetDepotVehiclePtData {
@@ -812,11 +810,8 @@ struct DepotWindow : Window {
 			case WID_D_SELL_ALL:
 				/* Only open the confirmation window if there are anything to sell */
 				if (this->vehicle_list.size() != 0 || this->wagon_list.size() != 0) {
-					TileIndex tile = this->window_number;
-					byte vehtype = this->type;
-
-					SetDParam(0, vehtype);
-					SetDParam(1, (vehtype == VEH_AIRCRAFT) ? GetStationIndex(tile) : GetDepotIndex(tile));
+					SetDParam(0, this->type);
+					SetDParam(1, this->GetDepotIndex());
 					ShowQuery(
 						STR_DEPOT_CAPTION,
 						STR_DEPOT_SELL_CONFIRMATION_TEXT,
@@ -842,7 +837,7 @@ struct DepotWindow : Window {
 		if (str == nullptr) return;
 
 		/* Do depot renaming */
-		DoCommandP(0, GetDepotIndex(this->window_number), 0, CMD_RENAME_DEPOT | CMD_MSG(STR_ERROR_CAN_T_RENAME_DEPOT), nullptr, str);
+		DoCommandP(0, this->GetDepotIndex(), 0, CMD_RENAME_DEPOT | CMD_MSG(STR_ERROR_CAN_T_RENAME_DEPOT), nullptr, str);
 	}
 
 	bool OnRightClick(Point pt, int widget) override
@@ -1080,6 +1075,16 @@ struct DepotWindow : Window {
 
 		return ES_NOT_HANDLED;
 	}
+
+	/**
+	 * Gets the DepotID of the current window.
+	 * In the case of airports, this is the station ID.
+	 * @return Depot or station ID of this window.
+	 */
+	inline uint16 GetDepotIndex() const
+	{
+		return (this->type == VEH_AIRCRAFT) ? ::GetStationIndex(this->window_number) : ::GetDepotIndex(this->window_number);
+	}
 };
 
 static void DepotSellAllConfirmationCallback(Window *win, bool confirmed)
diff --git a/src/pathfinder/yapf/yapf_costrail.hpp b/src/pathfinder/yapf/yapf_costrail.hpp
index 6cc7ab7aee..81966b29c3 100644
--- a/src/pathfinder/yapf/yapf_costrail.hpp
+++ b/src/pathfinder/yapf/yapf_costrail.hpp
@@ -625,7 +625,7 @@ no_entry_cost: // jump here at the beginning if the node has no parent (it is th
 			{
 				int min_speed = 0;
 				int max_speed = tf->GetSpeedLimit(&min_speed);
-				int max_veh_speed = v->GetDisplayMaxSpeed();
+				int max_veh_speed = std::min<int>(v->GetDisplayMaxSpeed(), v->current_order.GetMaxSpeed());
 				if (max_speed < max_veh_speed) {
 					extra_cost += YAPF_TILE_LENGTH * (max_veh_speed - max_speed) * (4 + tf->m_tiles_skipped) / max_veh_speed;
 				}
diff --git a/src/pathfinder/yapf/yapf_road.cpp b/src/pathfinder/yapf/yapf_road.cpp
index 90c246f76b..abdb7063d1 100644
--- a/src/pathfinder/yapf/yapf_road.cpp
+++ b/src/pathfinder/yapf/yapf_road.cpp
@@ -197,7 +197,7 @@ public:
 
 			/* add min/max speed penalties */
 			int min_speed = 0;
-			int max_veh_speed = v->GetDisplayMaxSpeed();
+			int max_veh_speed = std::min<int>(v->GetDisplayMaxSpeed(), v->current_order.GetMaxSpeed() * 2);
 			int max_speed = F.GetSpeedLimit(&min_speed);
 			if (max_speed < max_veh_speed) segment_cost += YAPF_TILE_LENGTH * (max_veh_speed - max_speed) * (4 + F.m_tiles_skipped) / max_veh_speed;
 			if (min_speed > max_veh_speed) segment_cost += YAPF_TILE_LENGTH * (min_speed - max_veh_speed);