--- a/src/ai/default/default.cpp	Thu Mar 27 17:51:20 2008 +0000
+++ b/src/ai/default/default.cpp	Thu Mar 27 19:02:18 2008 +0000
@@ -2460,7 +2460,7 @@
 	uint16 best_speed    = 0;
 	uint speed;
 
-	for (i = 0; i < NUM_TRAIN_ENGINES; i++) {
+	FOR_ALL_ENGINEIDS_OF_TYPE(i, VEH_TRAIN) {
 		const RailVehicleInfo *rvi = RailVehInfo(i);
 		const Engine* e = GetEngine(i);