locomotive of service train

例句：

1. 1. The train is equipped with a locomotive for its long journey.
   这列火车配备了一台机车，以完成长途旅行。
2. 2. The engineer must inspect the locomotive before starting the engine.
   工程师在启动引擎前必须检查机车。
3. 3. The locomotive's powerful engine powers the train forward.
   机车强大的发动机推动着火车前进。