A staff member cleans a security inspection machine at Tongzi East Railway Station in southwest China's Chongqing Municipality, Jan. 11, 2018. A railway connecting two major cities in southwest China, Chongqing and Guiyang is under trial run. 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/Han Ye)