山岳地区的铁路走向,常采取依山傍水,沿河谷蜿蜒而行。这样的铁路不仅工费省,而且能连通依托于江河有利条件发展起来的城镇,充分利用其既有的经济优势,加速建设进程。历史证明这种线路的选择是合理的。但也有其不利的一面。山区铁路地形和地质情况都 Mountain railway lines, often taken Yishanbangshui, winding along the valley line. Such a railway is not only a labor-saving province, but also connects cities and towns that have developed on the favorable conditions of the rivers to make full use of their existing economic advantages and speed up the construction process. History has proved that the choice of this route is reasonable. But it also has its downside. Mountain railway topography and geological conditions are