Aerial photo shows construction workers checking the steel rails at the Datong section of the Datong-Qinhuangdao railway in north China's Shanxi Province, April 7, 2019. The 653-km Datong-Qinhuangdao railway, which links the city of Datong in coal-rich Shanxi Province with the port city of Qinhuangdao of north China's Hebei Province, is an artery of China's coal transportation. It is ususally overhauled respectively in spring and autumn. During the overhaul time, the railway stops its service three hours a day so that construction workers are able to alter damaged rails, clean rail beds and clear silt. (Xinhua/Cao Yang)