rail stanchion

例句：

1. 1. The train was traveling on the main railway line.
   火车正在主要铁路线上行驶。
2. 2. The engineer inspected the rails for any damage.
   工程师检查了轨道是否有损坏。
3. 3. The construction workers were busy fixing the damaged rails.
   建筑工人忙于修理损坏的钢轨。