diff --git a/protos/alertConst.proto b/protos/alertConst.proto
index 0b1c757..125a9ad 100644
--- a/protos/alertConst.proto
+++ b/protos/alertConst.proto
@@ -56,4 +56,6 @@ enum AlertType {
   AXLE_LED_ORANGE_MOST = 16;
   //道岔大面积失表
   SWITCH_LOST_MOST = 17;
+  //信号故障
+  TRAIN_SIGNAL = 18;
 }