diff --git a/bin/ai/compat_1.4.nut b/bin/ai/compat_1.4.nut
--- a/bin/ai/compat_1.4.nut
+++ b/bin/ai/compat_1.4.nut
@@ -8,3 +8,10 @@
  */
 
 AILog.Info("1.4 API compatibility in effect.");
+
+/* 1.9 adds a vehicle type parameter. */
+AIBridge._GetName <- AIBridge.GetName;
+AIBridge.GetName <- function(bridge_id)
+{
+	return AIBridge._GetName(bridge_id, AIVehicle.VT_RAIL);
+}