diff -r 9e8b32366bd6 -r c7b92f03d33f src/roadveh_cmd.cpp
--- a/src/roadveh_cmd.cpp	Fri May 25 08:47:40 2007 +0000
+++ b/src/roadveh_cmd.cpp	Fri May 25 11:01:44 2007 +0000
@@ -957,6 +957,9 @@
 		return;
 	}
 
+	/* Trams can't overtake other trams */
+	if (v->u.road.roadtype == ROADTYPE_TRAM) return;
+
 	if (v->direction != u->direction || !(v->direction & 1)) return;
 
 	/* Check if vehicle is in a road stop, depot, tunnel or bridge or not on a straight road */