A pair of DF4s combined to work train K274/275/277 past the village of Dadaogoumen on the Beijing - Chifeng line on 28 September 2006. The train links Huhehaote (Hohhot), the capital of the Inner Mongolian Autonomous Region, with Hailaer, the largest city in the north-east of the province, a journey of 38 hours and almost 2500 km.