Datong–Qinhuangdao railway or Daqin railway, also known as the Daqin line, is a 653 km coal-transport railway in north China. Its name is derived from its two terminal cities, Datong, a coal mining center in Shanxi province, and Qinhuangdao in Hebei province, on the Bohai Sea.

The HXD2 is an electric locomotive and a series of related locomotive classes built by CNR Datong Electric Locomotive and Alstom. The locomotives designs are based on the Alstom Prima electric locomotives, and are a product of a cooperation agreement signed between the two companies in 2004. All locomotives are intended for heavy freight work, including coal trains on the Datong Qinhuangdao line.