diff -r cfa4db4b59f7 -r 1528b11097af src/train_cmd.cpp
--- a/src/train_cmd.cpp	Wed May 09 20:50:11 2007 +0000
+++ b/src/train_cmd.cpp	Thu May 10 06:42:43 2007 +0000
@@ -166,6 +166,9 @@
 
 		if (IsTrainEngine(u)) first_engine = u->engine_type;
 
+		/* Cache wagon override sprite group. NULL is returned if there is none */
+		u->u.rail.cached_override = GetWagonOverrideSpriteSet(u->engine_type, u->cargo_type, u->u.rail.first_engine);
+
 		if (rvi_u->visual_effect != 0) {
 			u->u.rail.cached_vis_effect = rvi_u->visual_effect;
 		} else {