--- a/rail_cmd.c	Wed Jul 20 22:02:58 2005 +0000
+++ b/rail_cmd.c	Wed Jul 20 22:05:13 2005 +0000
@@ -1352,7 +1352,7 @@
 		image |= _drawtile_track_palette;
 	image += tracktype_offs;
 	if (_display_opt & DO_TRANS_BUILDINGS) // show transparent depots
-		image = (image & 0x3FFF) | 0x3224000;
+		MAKE_TRANSPARENT(image);
 	AddSortableSpriteToDraw(image, ti->x + x, ti->y + y, xsize, ysize, zsize, ti->z + z);
 }