track transformer

例句：

1. 1. The track transformer is used to convert AC power into DC power for the train's motors.
   轨道变压器用于将交流电转换为直流电，以供火车的电机使用。
2. 2. The engineer used a track transformer to adjust the speed of the train.
   工程师使用轨道变压器来调整火车的速度。
3. 3. The track transformer was designed to improve the efficiency of the railway system.
   轨道变压器的设计旨在提高铁路系统的效率。