diff --git a/protos/device_state.proto b/protos/device_state.proto
index 9a50eaf..7c64b5a 100644
--- a/protos/device_state.proto
+++ b/protos/device_state.proto
@@ -122,6 +122,8 @@ message TrainState{
 	int64 trainKilometer = 14;
 	// 控制响应延时
 	int64 controlDelayTime = 15;
+	// 列车车头所在设备UID
+	string headDeviceUId = 16;
 }
 
 // 动力学列车状态