--- a/rail_map.h	Fri Dec 29 12:45:44 2006 +0000
+++ b/rail_map.h	Sat Dec 30 11:57:57 2006 +0000
@@ -18,7 +18,7 @@
 
 static inline RailTileType GetRailTileType(TileIndex t)
 {
-	assert(IsTileType(t, MP_RAILWAY));
+	assert(IsTileType(t, MP_RAILWAY) || IsTileType(t, MP_RAILWAY_BRIDGE));
 	return (RailTileType)(_m[t].m5 & RAIL_TILE_TYPE_MASK);
 }