How long is Jinshan Tunnel?

20. 14 km. According to the construction announcement of Dangjinshan Tunnel of China Railway 17th Bureau Group Co., Ltd., Dangjinshan Tunnel is a control project of Dunhuang-Golmud Railway, which passes through Altun Mountain and Qilian Mountain. The entrance of the tunnel is located on the north side of Dangjin Mountain Pass in the south of Aksai County, and the exit is located on the piedmont alluvial-diluvial plain on the south edge of Altun Mountain. The tunnel body is located at the junction of Qilian Mountain and Altun Mountain, with a high altitude, a design length of 20. 14km and a target driving speed of 60.65. The tunnel was designed by China Railway No.1 Survey and Design Institute Group Co., Ltd. and constructed by China Railway No.17 Bureau Group Co., Ltd.