The Lanzhou–Xinjiang high-speed railway, also known as Lanzhou–Xinjiang Passenger Railway is a high-speed railroad in Northwestern China from Lanzhou in Gansu Province to Ürümqi in the Xinjiang Uyghur Autonomous Region. It forms part of what China designates the Eurasia Continental Bridge corridor, a domestic high-speed railway corridor running from its city of Lianyungang in Jiangsu to the Kazakh border. The line is also shared with conventional trains.
Construction work began on November 4, 2009. The 1,776-kilometer (1,104 mi) railway took four years to complete, of which, 795 kilometers are in Gansu, 268 kilometers in Qinghai, and 713 kilometers in Xinjiang.
Unlike the existing Lanxin railway, which runs entirely in Gansu and Xinjiang, the new high-speed rail is routed from Lanzhou to Xining in Qinghai Province before heading northwest across the Qilian Mountains into the Hexi Corridor at Zhangye. The rail tracks in the section near Qilianshan No. 2 Tunnel are at 3,607 meters above sea level, making it the highest high-speed rail track in the world.
The line cuts train travel time between the two cities from 20 hours to 12 hours. It also freed up capacity on the older Lanzhou–Xinjiang railway for freight transport.
According to Wikipedia