rail guided machine

例句：

1. 1. The train is onthe main railway line.
   火车正在主要铁路线上行驶。
2. 2. The engineer inspected the railwaytracks before starting work.
   工程师在开始工作前检查了铁路轨道。
3. 3. Thetrain was delayed due toa damaged railway track.
   由于一条损坏的铁路轨道，火车被延误了。