tramlines

例句：

1. 1. The train lines are running smoothly through the tunnel.
   火车线路在隧道里运行得很顺畅。
2. 2. The engineer carefully checked each track line before starting the work.
   工程师在开始工作前仔细检查了每一条轨道线。
3. 3. The construction of new railway tracks is expected to start soon.
   新铁路轨道的建设预计将很快开始。