--- a/src/train_cmd.cpp	Sat Jun 02 15:47:38 2007 +0000
+++ b/src/train_cmd.cpp	Sat Jun 02 17:23:31 2007 +0000
@@ -839,6 +839,7 @@
 	Vehicle *u;
 	for (u = first; GetNextVehicle(u) != v; u = GetNextVehicle(u)) {}
 	GetLastEnginePart(u)->next = GetNextVehicle(v);
+	v->first = NULL; // we shouldn't point to the old first, since the vehicle isn't in that chain anymore
 	return first;
 }