diff --git a/protos/device_state.proto b/protos/device_state.proto
index 6069479..4dc9fab 100644
--- a/protos/device_state.proto
+++ b/protos/device_state.proto
@@ -396,6 +396,7 @@ message TrainVobcState {
 //    ATO牵引指令3
     bool atoTractionCommand3=74;
     uint32 mockInfo = 75; //车载接口输出的模拟量信息
+//  request.TrainControl.Direction historyDir = 76; //历史行驶方向，用于列车操控时，方向旋钮更改方向时使用，不在前端显示
 }
 
 // 发给前端的列车状态
diff --git a/protos/request.proto b/protos/request.proto
index f051688..4ab9897 100644
--- a/protos/request.proto
+++ b/protos/request.proto
@@ -202,7 +202,11 @@ message TrainControl{
     DIRECTION_KEY_SWITCH = 2;//方向钥匙
     HANDLER = 3; //手柄
   }
-
+  enum Direction{
+    BACKWARD = 0; //后退
+    FORWARD = 1; //前进
+    NEUTRALWARD = 2;//中位
+  }
   //紧急制动
   message EmergentButton{
     bool active = 1;