diff --git a/train_cmd.c b/train_cmd.c
--- a/train_cmd.c
+++ b/train_cmd.c
@@ -3560,7 +3560,7 @@ int32 GetTrainRunningCost(const Vehicle 
 		const RailVehicleInfo *rvi = RailVehInfo(v->engine_type);
 		if (rvi->running_cost_base > 0)
 			cost += rvi->running_cost_base * _price.running_rail[rvi->running_cost_class];
-	} while ((v = v->next) != NULL);
+	} while ((v = GetNextVehicle(v)) != NULL);
 
 	return cost;
 }