Datong–Xi'an high-speed railway or Daxi HSR (simplified Chinese: 大西客运专线; traditional Chinese: 大西客運專線; pinyin: Dà–Xī kèyùn zhuānxiàn) is a dual-track, electrified, high-speed rail line operated by CR Taiyuan Group and CR Xi'an Group between Datong, Shanxi and Xi'an, Shaanxi.

[2] The high speed rail line will run down the length of Shanxi Province from Datong in the north through Shuozhou, Xinzhou, the provincial capital Taiyuan, Jinzhong, Linfen and Yuncheng.

[1] As of 2022, most of the high-speed line is finished, but the section between Huairen East and Yuanping West runs on the 153-kilometre (95 mi)-long Hanjialing–Yuanping railway, a line built mainly for freight with a design speed of 160 kilometres per hour (99 mph) that was opened on 29 March 2014 to bypass a section of the Datong–Puzhou railway.

In future passenger traffic will run on a section of the new Jining–Datong–Yuanping high-speed railway that has been officially under construction next to the line from Datong South to Yuanping West since June 2020.

Together with the Shijiazhuang–Taiyuan high-speed railway, the Taiyuan-Xi'an section of the Datong–Xi'an passenger railway provides a potential more direct route for high-speed passenger trains between Beijing and Xi'an (and points west) than the usual route via Zhengzhou (1,092 km (679 mi) via Taiyuan vs. 1,212 km (753 mi)).