在我们兰州铁路局管内,由于山岳连绵,铁路的特点是线路坡道大,曲线多,平道少,站线短,区间距离近,会让次数多。因此,运输能力受到速度、重量、密度的限制,难以适应铁路运输日益发展的要求。目 In our Lanzhou Railway Administration, because of the rolling mountains, the railway is characterized by a large number of ramps, large curves, few flat roads, short station lines and short distance between zones. Therefore, the transportation capacity is limited by the speed, weight and density, so it is difficult to meet the requirements of the increasingly developed railway transportation. Head