A passenger boards 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)

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)

A train attendant shares a cake with passengers to celebrate the 4th anniversary of operation of the Chongqing-Wanzhou high-speed railway on the train No. C6406, 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)

A train attendant signs on a board celebrating the 4th anniversary of operation of the Chongqing-Wanzhou high-speed railway on the train No. C6406, 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)