rail-mounted overhead crane

例句：

1. 1.The railway crane is used to transport heavy loads across the tracks.
   铁路起重机用来在轨道上运输重物。
2. 2.The engineer needs to operate the rail-mounted overhead crane safely.
   工程师需要安全地操作铁路起重机。
3. 3. The construction site has a large rail-mounted overhead crane for lifting heavy equipment.
   施工现场有一台大型的铁路起重机用于吊装重型设备。