electrical train indicator

例句：

1. 1.The electrical train indicator on the platform shows the current speed of the train.
   站台上的电气列车指示器显示了火车的当前速度。
2. 2.The electrical train indicator was used to indicate the arrival of the train at the station.
   电气列车指示器被用来指示火车在车站的到达。
3. 3. The electrical train indicator is an essential part of the railway system, helping to ensure safe and efficient travel.
   电气列车指示器是铁路系统的重要组成部分，有助于确保安全和高效的旅行。