A staff member examines interfaces of welded steel rails at Wuhu North Rail Welding Base in Wuhu, east China's Anhui Province, Aug. 5, 2016. Workers at Wuhu North Rail Welding Base are responsible for welding five 100-meter-long rails into a 500-meter-long railroad track. Since the base was established in 2009, more than 8,300-kilometer-long steel rails, most of which have been used in high-speed railways, have been welded here. (Xinhua/Liu Junxi)
