“七五”期间,成都铁路局切实依靠科技进步,通过更新改造,挖潜扩能全面促进了运输生产,使我局的整体技术水平达到了一个新的高度。一、针对特点,开发推广成都铁路局地处祖国西南,管辖5700多公里正线铁路,其中桥梁3200座(总长270多公里)隧道1400座(总长700多公里),并且曲线半径小、坡度大,行车密度,速度和牵引 During the “Seventh Five-year Plan” period, Chengdu Railway Bureau truly relied on scientific and technological progress, promoted comprehensively the transport production through renovation and expansion, and tapped the potential for expansion. As a result, the overall technical level of the Bureau reached a new height. I. Characteristics, Development and Promotion Chengdu Railway Bureau is located in the southwest of the motherland, covering more than 5700 km of the main line of the railway, of which 3200 bridges (total length 270 km) tunnel 1400 (total length 700 km), and the curve of small radius, large slope , Driving density, speed and traction