--- a/src/yapf/follow_track.hpp	Sun Jun 24 12:27:11 2007 +0000
+++ b/src/yapf/follow_track.hpp	Sun Jun 24 13:18:54 2007 +0000
@@ -252,7 +252,7 @@
 
 public:
 	/** Helper for pathfinders - get min/max speed on the m_old_tile/m_old_td */
-	int GetSpeedLimit(int *pmin_speed = NULL)
+	int GetSpeedLimit(int *pmin_speed = NULL) const
 	{
 		int min_speed = 0;
 		int max_speed = INT_MAX; // no limit