The Datong–Zhangjiakou high-speed railway, also known as the Dazhang passenger dedicated line (Chinese: 大张客运专线; pinyin: Dàzhāng kèyùn zhuānxiàn) is a high-speed railway between Zhangjiakou in Hebei province in the east and Datong in Shanxi province in the west.

The total length of the main line is about 141.524 kilometres (87.939 mi).

It is connected to the Beijing–Zhangjiakou intercity railway at Zhangjiakou station, and shares the tracks of the Huzhang Passenger Dedicated Line between Zhangjiakou station and Huai'an station.

The Da Zhang Passenger Dedicated Line forks out at Huai'an Station and is connected to the Datong–Xi'an passenger railway at Datong South.

[1] It forms part of the Beijing–Zhangjiakou–Datong–Taiyuan branch of the Beijing–Kunming corridor.