railroad lines opened to traffic

例句：

1. 1. The train will pass by the station on its way to the city.
   火车在前往城市的途中会经过这个车站。
2. 2. The engineer inspected the railroad tracks before starting the construction.
   工程师在开始施工前检查了铁路轨道。
3. 3. The new rail system is expected to improve transportation efficiency.
   新的铁路系统预计将提高运输效率。