diff --git a/bin/ai/compat_1.1.nut b/bin/ai/compat_1.1.nut
--- a/bin/ai/compat_1.1.nut
+++ b/bin/ai/compat_1.1.nut
@@ -56,3 +56,10 @@ AIOrder.AIOF_UNLOAD_FLAGS <- AIOrder.OF_
 AIOrder.AIOF_LOAD_FLAGS <- AIOrder.OF_LOAD_FLAGS
 AIOrder.AIOF_DEPOT_FLAGS <- AIOrder.OF_DEPOT_FLAGS
 AIOrder.AIOF_INVALID <- AIOrder.OF_INVALID
+
+/* 1.9 adds a vehicle type parameter. */
+AIBridge._GetName <- AIBridge.GetName;
+AIBridge.GetName <- function(bridge_id)
+{
+	return AIBridge._GetName(bridge_id, AIVehicle.VT_RAIL);
+}