铁路跨线桥 meaning in Chinese

railroad underbridge
railway underbridge
turnpike

At north pieces of railway deck bridge at tongji university way , treasure it designs to be at new urban thingseses at backbone of city distance by yang way yang project treasure , the red line of road is 45 meters wide , ward off the way of urban backbone built once
宝杨路、铁山路拓宽改建工程：宝杨路工程由北段铁路跨线桥西至同济路，宝杨路设计为新城区东西向城市主干路，道路红线宽45米，一次辟筑的城市主干路。