diff --git a/component/train.go b/component/train.go
index b3a91c2..23660f2 100644
--- a/component/train.go
+++ b/component/train.go
@@ -26,6 +26,10 @@ func (t *TrainPositionInfo) ToString() string {
 	return fmt.Sprintf("Up=%t len=%d headLink=%s headOff=%d tailLink=%s tailOff=%d", t.Up, t.Len, t.HeadLink, t.HeadLinkOffset, t.TailLink, t.TailLinkOffset)
 }
 
+// TrainBtm 列车应答器传输模块
+type TrainBtm struct {
+}
+
 var (
 	TrainPositionInfoType = ecs.NewComponentType[TrainPositionInfo]()
 )