--- a/src/rail_cmd.cpp	Tue Jun 24 15:58:01 2008 +0000
+++ b/src/rail_cmd.cpp	Tue Jun 24 23:38:10 2008 +0000
@@ -1113,6 +1113,7 @@
 
 	if (!ValParamTrackOrientation(track) ||
 			!IsTileType(tile, MP_RAILWAY) ||
+			!HasTrack(tile, track) ||
 			!EnsureNoTrainOnTrack(tile, track) ||
 			!HasSignalOnTrack(tile, track)) {
 		return CMD_ERROR;