Aerial photo taken on April 16, 2019 shows a train running on the Datong-Qinhuangdao railway after its overhaul. 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)