--- a/rail_cmd.c	Fri Oct 07 07:35:15 2005 +0000
+++ b/rail_cmd.c	Fri Oct 07 15:53:33 2005 +0000
@@ -991,7 +991,7 @@
 
 	// change type.
 	if (exec) {
-		SB(_m[tile].m3, 4, 4, totype);
+		SB(_m[tile].m3, 0, 4, totype);
 		MarkTileDirtyByTile(tile);
 	}