diff --git a/protos/stationLayoutGraphics.proto b/protos/stationLayoutGraphics.proto
index b591c22..1c92212 100644
--- a/protos/stationLayoutGraphics.proto
+++ b/protos/stationLayoutGraphics.proto
@@ -121,6 +121,7 @@ message StationLine {
 message TrainWindow {
   CommonInfo common = 1;
   string code = 2;
+  string sectionId = 3;
 }
 
 message Train {