Tongliao based DF4D 0255 worked train K274/K275/K277 north from Shitanglu on the Beijing - Longhua line on 19 October 2008. This service connects the capital of the Inner Mongolian Autonomous Region, Huhehaote (Hohhot), with Chifeng, Tongliao and Hailaer, the three largest cities in the east of the region, and takes almost 40 hours to complete the 2475km journey.