--- a/src/aircraft.h	Tue May 01 18:17:52 2007 +0000
+++ b/src/aircraft.h	Wed May 02 09:29:41 2007 +0000
@@ -133,6 +133,8 @@
 	const char *GetTypeString() { return "aircraft"; }
 	void MarkDirty();
 	void UpdateDeltaXY(Direction direction);
+	ExpensesType GetExpenseType(bool income) { return income ? EXPENSES_AIRCRAFT_INC : EXPENSES_AIRCRAFT_RUN; }
+	WindowClass GetVehicleListWindowClass() { return WC_AIRCRAFT_LIST; }
 };
 
 #endif /* AIRCRAFT_H */

--- a/src/openttd.h	Tue May 01 18:17:52 2007 +0000
+++ b/src/openttd.h	Wed May 02 09:29:41 2007 +0000
@@ -473,7 +473,7 @@
 };
 
 
-enum {
+enum ExpensesType {
 	EXPENSES_CONSTRUCTION =  0,
 	EXPENSES_NEW_VEHICLES =  1,
 	EXPENSES_TRAIN_RUN    =  2,

--- a/src/roadveh.h	Tue May 01 18:17:52 2007 +0000
+++ b/src/roadveh.h	Wed May 02 09:29:41 2007 +0000
@@ -41,6 +41,8 @@
 	const char *GetTypeString() { return "road vehicle"; }
 	void MarkDirty();
 	void UpdateDeltaXY(Direction direction);
+	ExpensesType GetExpenseType(bool income) { return income ? EXPENSES_ROADVEH_INC : EXPENSES_ROADVEH_RUN; }
+	WindowClass GetVehicleListWindowClass() { return WC_ROADVEH_LIST; }
 };
 
 #endif /* ROADVEH_H */

--- a/src/ship.h	Tue May 01 18:17:52 2007 +0000
+++ b/src/ship.h	Wed May 02 09:29:41 2007 +0000
@@ -42,6 +42,8 @@
 	const char *GetTypeString() { return "ship"; }
 	void MarkDirty();
 	void UpdateDeltaXY(Direction direction);
+	ExpensesType GetExpenseType(bool income) { return income ? EXPENSES_SHIP_INC : EXPENSES_SHIP_RUN; }
+	WindowClass GetVehicleListWindowClass() { return WC_SHIPS_LIST; }
 };
 
 #endif /* SHIP_H */

--- a/src/train.h	Tue May 01 18:17:52 2007 +0000
+++ b/src/train.h	Wed May 02 09:29:41 2007 +0000
@@ -246,6 +246,8 @@
 	const char *GetTypeString() { return "train"; }
 	void MarkDirty();
 	void UpdateDeltaXY(Direction direction);
+	ExpensesType GetExpenseType(bool income) { return income ? EXPENSES_TRAIN_INC : EXPENSES_TRAIN_RUN; }
+	WindowClass GetVehicleListWindowClass() { return WC_TRAINS_LIST; }
 };
 
 #endif /* TRAIN_H */

--- a/src/vehicle.cpp	Tue May 01 18:17:52 2007 +0000
+++ b/src/vehicle.cpp	Wed May 02 09:29:41 2007 +0000
@@ -2970,13 +2970,9 @@
 	current_order.type = OT_LOADING;
 	GetStation(this->last_station_visited)->loading_vehicles.push_back(this);
 
-	static const int expense_type[] = { EXPENSES_TRAIN_INC, EXPENSES_ROADVEH_INC, EXPENSES_SHIP_INC, EXPENSES_AIRCRAFT_INC };
-	SET_EXPENSES_TYPE(expense_type[this->type]);
-
+	SET_EXPENSES_TYPE(this->GetExpenseType(true));
 	if (LoadUnloadVehicle(this, true) != 0) {
-		static const WindowClass invalidate_windows[] = { WC_TRAINS_LIST, WC_ROADVEH_LIST, WC_SHIPS_LIST, WC_AIRCRAFT_LIST };
-		InvalidateWindow(invalidate_windows[this->type], this->owner);
-
+		InvalidateWindow(this->GetVehicleListWindowClass(), this->owner);
 		this->MarkDirty();
 	}
 	InvalidateWindowWidget(WC_VEHICLE_VIEW, this->index, STATUS_BAR);

--- a/src/vehicle.h	Tue May 01 18:17:52 2007 +0000
+++ b/src/vehicle.h	Wed May 02 09:29:41 2007 +0000
@@ -365,6 +365,17 @@
 	 * @param direction the direction the vehicle is facing
 	 */
 	virtual void UpdateDeltaXY(Direction direction) {}
+
+	/**
+	 * Sets the expense type associated to this vehicle type
+	 * @param income whether this is income or (running) expenses of the vehicle
+	 */
+	virtual ExpensesType GetExpenseType(bool income) { return EXPENSES_OTHER; }
+
+	/**
+	 * Invalidates the vehicle list window of this type of vehicle
+	 */
+	virtual WindowClass GetVehicleListWindowClass() { return WC_NONE; }
 };
 
 /**