China rolled off production line a prototype magnetic-levitation train with a top speed of 600 km per hour in the eastern city of Qingdao on May 23, 2019. The debut of China's first high-speed maglev train testing prototype marks a major breakthrough for the country in high-speed maglev transit system. (Photo/Xinhua)

China rolled off production line a prototype magnetic-levitation train with a top speed of 600 km per hour in the eastern city of Qingdao on May 23, 2019. The debut of China's first high-speed maglev train testing prototype marks a major breakthrough for the country in high-speed maglev transit system. (Photo/Xinhua)

China rolled off production line a prototype magnetic-levitation train with a top speed of 600 km per hour in the eastern city of Qingdao on May 23, 2019. The debut of China's first high-speed maglev train testing prototype marks a major breakthrough for the country in high-speed maglev transit system. (Photo/Xinhua)