rail mill

例句：

1. 1. The train is pulling out of the station on the main railway track.
   火车正在离开车站，沿着主铁路轨道行驶。
2. 2. They built a new bridge over the river to improve the railway track.
   他们修建了一座新桥横跨河流，以改善铁路轨道。
3. 3. The engineer carefully inspected the railway track for any damage.
   工程师仔细检查了铁路轨道，以确定是否有损坏。