--- a/src/vehicle_func.h	Sat May 24 23:18:21 2008 +0000
+++ b/src/vehicle_func.h	Sun May 25 09:40:44 2008 +0000
@@ -24,6 +24,7 @@
 void VehicleServiceInDepot(Vehicle *v);
 void VehiclePositionChanged(Vehicle *v);
 Vehicle *GetLastVehicleInChain(Vehicle *v);
+const Vehicle *GetLastVehicleInChain(const Vehicle *v);
 uint CountVehiclesInChain(const Vehicle *v);
 bool IsEngineCountable(const Vehicle *v);
 void DeleteVehicleChain(Vehicle *v);
@@ -173,7 +174,7 @@
 void StopAllVehicles();
 
 extern VehicleID _vehicle_id_ctr_day;
-extern Vehicle *_place_clicked_vehicle;
+extern const Vehicle *_place_clicked_vehicle;
 extern VehicleID _new_vehicle_id;
 extern uint16 _returned_refit_capacity;