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山区铁路列车牵引重量,主要取决于长大坡道上的牵引重量,而长大坡道多位于穿越分水岭的隧道内,所以提高山区铁路列车牵引重量,在一定程度上可以归结为提高列车通过长隧道的牵引力。在运输上,为使全线牵引重量达到均衡,坡度大的长隧道多采用双机或多机牵引方式。如成昆线的沙木拉打隧道(长6382m,坡度为9.75‰)、川黔线凉风垭隧道(长4270m,坡度为16.5‰)、天兰线松树湾隧道(长2210m,坡度为10.6‰),枝柳线彭莫山
Traction weight of mountain railway trains mainly depends on the traction weight of the growing uphill and the growing uplifts are mostly located inside the tunnel crossing the watershed. Therefore, increasing the traction weight of mountain railway trains can be attributed to some extent to improving the train passing through the long tunnel Traction. In the transportation, in order to achieve a balanced traction across the board, large tunnels with long slopes use double or multiple tractors. For example, the sand tunnel of Cheng-Kun line (length 6382m, slope of 9.75 ‰), the Liangchuanya tunnel of Sichuan-Guizhou line (length 4270m, gradient 16.5 ‰), Songshuwan tunnel of Tianlan line (length 2210m, gradient 10.6 ‰), Pennyu line Pomerimo