diff -r d65bf8f154bc -r 012c308c2870 newgrf_engine.c
--- a/newgrf_engine.c	Tue Jun 20 07:07:28 2006 +0000
+++ b/newgrf_engine.c	Tue Jun 20 13:15:56 2006 +0000
@@ -727,6 +727,7 @@
 				case 0x77: return v->u.rail.cached_power & 0xFF;
 				case 0x7C: return v->first->index;
 				case 0x7D: return v->first->index & 0xFF;
+				case 0x7F: return 0; // Used for vehicle reversing hack in TTDP
 			}
 			break;