diff -r 88d71dbdcd13 -r 5dd99f3b7eca ai.c
--- a/ai.c	Fri Dec 03 14:38:02 2004 +0000
+++ b/ai.c	Fri Dec 03 21:57:05 2004 +0000
@@ -121,7 +121,7 @@
 	int i;
 
 	for (i = 0; i < NUM_TRAIN_ENGINES; i++) {
-		RailVehicleInfo *rvi = &rail_vehinfo(i);
+		const RailVehicleInfo *rvi = rail_vehinfo(i);
 		Engine *e = DEREF_ENGINE(i);
 
 		if (e->railtype != railtype || rvi->flags & RVI_WAGON