A railway policeman and his dog to serve for the first train which is to start operation on Chongqing-Guiyang railway make the debut in Chongqing West Railway Station in Chongqing, southwest China, Jan. 16, 2018. Chongqing-Guiyang railway connects Chongqing and Guiyang, two major cities in southwest China. Designed for passenger trains running at a speed of 200 kilometers per hour, the railway will improve traffic between China's southwest and northwestern, eastern, southern areas. (Xinhua/Wang Quanchao)