--- a/rail_cmd.c	Tue May 09 08:25:31 2006 +0000
+++ b/rail_cmd.c	Tue May 09 09:56:09 2006 +0000
@@ -349,7 +349,7 @@
 					GetTransportTypeUnderBridge(tile) != TRANSPORT_RAIL ||
 					GetRailBitsUnderBridge(tile) != trackbit ||
 					(_current_player != OWNER_WATER && !CheckTileOwnership(tile)) ||
-					!EnsureNoVehicleZ(tile, TilePixelHeight(tile))) {
+					!EnsureNoVehicleOnGround(tile)) {
 				return CMD_ERROR;
 			}