--- a/newgrf_engine.h	Fri Mar 31 10:04:18 2006 +0000
+++ b/newgrf_engine.h	Fri Mar 31 10:14:25 2006 +0000
@@ -18,7 +18,7 @@
 void SetCustomEngineSprites(EngineID engine, byte cargo, struct SpriteGroup *group);
 // loaded is in percents, overriding_engine 0xffff is none
 int GetCustomEngineSprite(EngineID engine, const Vehicle* v, Direction direction);
-uint16 GetCallBackResult(uint16 callback_info, EngineID engine, const Vehicle *v);
+uint16 GetVehicleCallback(byte callback, uint32 param1, uint32 param2, EngineID engine, const Vehicle *v);
 bool UsesWagonOverride(const Vehicle *v);
 #define GetCustomVehicleSprite(v, direction) GetCustomEngineSprite(v->engine_type, v, direction)
 #define GetCustomVehicleIcon(et, direction) GetCustomEngineSprite(et, NULL, direction)