# HG changeset patch
# User hackykid <hackykid@openttd.org>
# Date 2005-06-06 21:32:04
# Node ID 305bb198f3332360621371c45f7739db5efe8553
# Parent  d5c216cb79ed22bdf92526b4981956f4574041d5

(svn r2427)  - Fix: CmdMoveRailVehice; Prevent possible assertion failure when moving vehicles within one chain.

diff --git a/train_cmd.c b/train_cmd.c
--- a/train_cmd.c
+++ b/train_cmd.c
@@ -845,6 +845,9 @@ int32 CmdMoveRailVehicle(int x, int y, u
 				src_head = NULL;
 			}
 		} else {
+			// if moving within the same chain, dont use dst_head as it may get invalidated
+			if (src_head == dst_head)
+				dst_head = NULL;
 			// unlink single wagon from linked list
 			src_head = UnlinkWagon(src, src_head);
 			src->next = NULL;