diff --git a/src/drawApp/graphics/TrainInteraction.ts b/src/drawApp/graphics/TrainInteraction.ts
index 6210271..1441f4b 100644
--- a/src/drawApp/graphics/TrainInteraction.ts
+++ b/src/drawApp/graphics/TrainInteraction.ts
@@ -5,7 +5,7 @@ import { state } from 'src/protos/device_state';
 import { MenuItemOptions } from 'src/jl-graphic/ui/Menu';
 import { ContextMenu } from 'src/jl-graphic/ui/ContextMenu';
 import {
-  GraphicApp,
+  IGraphicApp,
   GraphicInteractionPlugin,
   JlGraphic,
 } from 'src/jl-graphic';
@@ -99,13 +99,13 @@ export class TrainState extends GraphicStateBase implements ITrainState {
     this.states.headDirection = v;
   }
   get dynamicState(): state.TrainDynamicState {
-    return this.states.dynamicState;
+    return this.states.dynamicState || new state.TrainDynamicState();
   }
   set dynamicState(v: state.TrainDynamicState) {
     this.states.dynamicState = new state.TrainDynamicState(v);
   }
   get vobcState(): state.TrainVobcState {
-    return this.states.vobcState;
+    return this.states.vobcState || new state.TrainVobcState();
   }
   set vobcState(v: state.TrainVobcState) {
     this.states.vobcState = new state.TrainVobcState(v);
@@ -135,11 +135,11 @@ const TrainOperateMenu: ContextMenu = ContextMenu.init({
 
 export class TrainOperateInteraction extends GraphicInteractionPlugin<Train> {
   static Name = 'train_operate_menu';
-  constructor(app: GraphicApp) {
+  constructor(app: IGraphicApp) {
     super(TrainOperateInteraction.Name, app);
     app.registerMenu(TrainOperateMenu);
   }
-  static init(app: GraphicApp) {
+  static init(app: IGraphicApp) {
     return new TrainOperateInteraction(app);
   }
   filter(...grahpics: JlGraphic[]): Train[] | undefined {