A staff member checks the train No. C6406 of the Chongqing-Wanzhou high-speed railway at the Chongqing North Railway Station in Chongqing, southwest China, Nov. 26, 2020. The Chongqing-Wanzhou high-speed railway celebrated its 4th anniversary of operation on Thursday. As of Nov. 25, the railway line has seen 53,616 trains running and transporting over 34.9 million passengers in total, with travel efficiency and quality greatly improved. (Xinhua/Tang Yi)