diff --git a/src/graphics/sectionLink/SectionLink.ts b/src/graphics/sectionLink/SectionLink.ts
index e9beb62..18b1bae 100644
--- a/src/graphics/sectionLink/SectionLink.ts
+++ b/src/graphics/sectionLink/SectionLink.ts
@@ -52,7 +52,7 @@ export class SectionLink extends JlGraphic implements ILineGraphic {
   lineGraphic: Graphics;
   labelGraphic: VectorText;
   divisionGraphic: Graphics = new Graphics();
-  _linkLength = 0;
+  _linkLength = 0; // link长度
 
   constructor() {
     super(SectionLink.Type);
@@ -152,6 +152,7 @@ export class SectionLink extends JlGraphic implements ILineGraphic {
     this.updateData(old);
   }
   get linkLength(): number {
+    // 根据aSimRef和bSimRef获取link两侧公里标，计算link长度
     if (!this._linkLength) {
       const queryStore = this.getGraphicApp().queryStore;
       const aSimDevice = queryStore.queryById(this.datas.aSimRef.id);
diff --git a/src/graphics/train/Train.ts b/src/graphics/train/Train.ts
index 6596c72..0aeb161 100644
--- a/src/graphics/train/Train.ts
+++ b/src/graphics/train/Train.ts
@@ -9,9 +9,7 @@ import {
   calculateMirrorPoint,
   distance,
 } from 'src/jl-graphic';
-import { AxleCounting } from '../axleCounting/AxleCounting';
 import { SectionLink } from '../sectionLink/SectionLink';
-import { Turnout } from '../turnout/Turnout';
 
 export interface ITrainData extends GraphicData {
   get code(): string; // 车号
@@ -106,9 +104,9 @@ export class TrainHead extends Container {
     this.pause.clear();
   }
   doRepaint(states: ITrainState, bodyWH?: bodyWH) {
-    let direction = 'right';
+    let direction = 'left';
     if (states.up) {
-      direction = 'left';
+      direction = 'right';
     }
     this.clear();
     if (!direction) {