rack locomotive

例句：

1. 1.The engineer inspected the new locomotive before it was put into service.
   工程师在火车头投入使用前对其进行了检查。
2. 2.The locomotive's powerful engine made it possible to transport goods over long distances.
   火车头的强劲引擎使得长途运输成为可能。
3. 3. The engineer carefully maintained the locomotive to ensure its safe operation.
   工程师仔细维护火车头，确保其安全运行。