--- a/yapf/follow_track.hpp	Mon May 29 18:39:42 2006 +0000
+++ b/yapf/follow_track.hpp	Tue May 30 10:53:27 2006 +0000
@@ -13,12 +13,12 @@
 {
 	CPerformanceTimer* m_pPerf;
 
-	FORCEINLINE CFollowTrackT(Vehicle* v = NULL, CPerformanceTimer* pPerf = NULL)
+	FORCEINLINE CFollowTrackT(const Vehicle* v = NULL, CPerformanceTimer* pPerf = NULL)
 	{
 		Init(v, pPerf);
 	}
 
-	FORCEINLINE void Init(Vehicle* v, CPerformanceTimer* pPerf)
+	FORCEINLINE void Init(const Vehicle* v, CPerformanceTimer* pPerf)
 	{
 		assert(!IsRailTT() || (v != NULL && v->type == VEH_Train));
 		m_veh = v;