diff --git a/protos/device_state.proto b/protos/device_state.proto
index cec1fea..222796b 100644
--- a/protos/device_state.proto
+++ b/protos/device_state.proto
@@ -152,6 +152,8 @@ message TrainState{
 	int64 trainKilometer = 14;
 	// 控制响应延时
 	int64 controlDelayTime = 15;
+	// 列车轮径
+	int32 wheelDiameter = 16;
 }
 
 // 动力学列车状态