Aerial photo taken on March 27, 2020 shows a China-Europe container train ready to depart from Tuanjiecun Station in Chongqing, southwest China. A container train pulled out from Tuanjiecun Station in Chongqing Friday morning, marking a total of 10,000 journeys of China-Europe trains from southwest China's Chengdu and Chongqing. (Xinhua/Tang Yi)

A China-Europe container train is ready to depart from Tuanjiecun Station in Chongqing, southwest China, March 27, 2020. A container train pulled out from Tuanjiecun Station in Chongqing Friday morning, marking a total of 10,000 journeys of China-Europe trains from southwest China's Chengdu and Chongqing. (Xinhua/Tang Yi)

A China-Europe container train is ready to depart from Tuanjiecun Station in Chongqing, southwest China, March 27, 2020. A container train pulled out from Tuanjiecun Station in Chongqing Friday morning, marking a total of 10,000 journeys of China-Europe trains from southwest China's Chengdu and Chongqing. (Xinhua/Tang Yi)

Aerial photo taken on March 27, 2020 shows a China-Europe container train leaving Tuanjiecun Station in Chongqing, southwest China. A container train pulled out from Tuanjiecun Station in Chongqing Friday morning, marking a total of 10,000 journeys of China-Europe trains from southwest China's Chengdu and Chongqing. (Xinhua/Tang Yi)

A railway worker signals as a China-Europe container train is ready to depart from Tuanjiecun Station in Chongqing, southwest China, March 27, 2020. A container train pulled out from Tuanjiecun Station in Chongqing Friday morning, marking a total of 10,000 journeys of China-Europe trains from southwest China's Chengdu and Chongqing. (Xinhua/Tang Yi)