Traction calculation of trains is one the important composing of the whole urban rail traffic. 列车牵引计算是整个城市轨道交通的重要组成部分。
With more overhead railway lines built in a city, it is worried about the railway accident occuring on the overhead urban railway. 摘要随著城市轨道交通高架化的大力推行，救援人员必须对高架桥上的起复抢修进行预案准备。
