A railway staff member works beside the bullet train G319 at Chongqing West Railway Station in southwest China's Chongqing, July 11, 2019. The bullet train G319 departed Chongqing West Railway Station at 8:20 a.m. and will arrive at Hong Kong West Kowloon Station around 7.5 hours later. A second-class seat for the 7.5-hour ride costs 660 yuan (about 96 U.S. dollars). (Xinhua/Tang Yi)

A railway staff member walks past the bullet train G319 at Chongqing West Railway Station in southwest China's Chongqing, July 11, 2019.(Xinhua/Tang Yi)

A child waves from inside the window of the bullet train G319 at Chongqing West Railway Station in southwest China's Chongqing, July 11, 2019.(Xinhua/Tang Yi)

Passengers show their tickets aboard the bullet train G319 at Chongqing West Railway Station in southwest China's Chongqing, July 11, 2019.(Xinhua/Tang Yi)