--- a/vehicle.h	Wed Mar 09 18:19:13 2005 +0000
+++ b/vehicle.h	Wed Mar 09 19:09:04 2005 +0000
@@ -325,7 +325,7 @@
 void UpdateTrainAcceleration(Vehicle *v);
 int32 GetTrainRunningCost(Vehicle *v);
 
-int CheckTrainStoppedInDepot(Vehicle *v);
+int CheckTrainStoppedInDepot(const Vehicle *v);
 
 bool VehicleNeedsService(const Vehicle *v);