diff -r 5a8b295aa345 -r 4cc327ad39d5 src/roadveh.h
--- a/src/roadveh.h	Tue Mar 27 23:27:27 2007 +0000
+++ b/src/roadveh.h	Sat Jun 02 19:59:29 2007 +0000
@@ -1,5 +1,7 @@
 /* $Id$ */
 
+/** @file src/roadveh.h Road vehicle states */
+
 #ifndef ROADVEH_H
 #define ROADVEH_H
 
@@ -20,4 +22,28 @@
 void CcBuildRoadVeh(bool success, TileIndex tile, uint32 p1, uint32 p2);
 void CcCloneRoadVeh(bool success, TileIndex tile, uint32 p1, uint32 p2);
 
+
+/**
+ * This class 'wraps' Vehicle; you do not actually instantiate this class.
+ * You create a Vehicle using AllocateVehicle, so it is added to the pool
+ * and you reinitialize that to a Train using:
+ *   v = new (v) RoadVehicle();
+ *
+ * As side-effect the vehicle type is set correctly.
+ */
+struct RoadVehicle : public Vehicle {
+	/** Initializes the Vehicle to a road vehicle */
+	RoadVehicle() { this->type = VEH_ROAD; }
+
+	/** We want to 'destruct' the right class. */
+	virtual ~RoadVehicle() {}
+
+	const char *GetTypeString() const { return "road vehicle"; }
+	void MarkDirty();
+	void UpdateDeltaXY(Direction direction);
+	ExpensesType GetExpenseType(bool income) const { return income ? EXPENSES_ROADVEH_INC : EXPENSES_ROADVEH_RUN; }
+	WindowClass GetVehicleListWindowClass() const { return WC_ROADVEH_LIST; }
+	bool IsPrimaryVehicle() const { return true; }
+};
+
 #endif /* ROADVEH_H */