(svn r21975) -Add: console command to reset the engine pool. It removes the traces of engines which are no longer associated to a NewGRF, and can be used to e.g. 'fix' scenarios which were screwed up by the author. You can only use it when there are no vehicles in the game though.

src/engine_base.h

@@ -114,6 +114,8 @@ struct EngineOverrideManager : SmallVector<EngineIDMapping, 256> {
 
 	void ResetToDefaultMapping();
 	EngineID GetID(VehicleType type, uint16 grf_local_id, uint32 grfid);
+
+	static bool ResetToCurrentNewGRFConfig();
 };
 
 extern EngineOverrideManager _engine_mngr;