A train attendant poses next to a high-speed train during its trial operation along the Shangqiu-Hefei-Hangzhou High-speed Railway at Zhegao Railway Station in Chaohu City, east China's Anhui Province, May 27, 2020. The Hefei-Huzhou section of the Shangqiu-Hefei-Hangzhou High-speed Railway entered a trial operation phase on Wednesday. (Xinhua/Liu Junxi)

A high-speed train runs on Yuxi River Bridge during its trial operation along the Shangqiu-Hefei-Hangzhou High-speed Railway in Chaohu City, east China's Anhui Province, May 27, 2020. The Hefei-Huzhou section of the Shangqiu-Hefei-Hangzhou High-speed Railway entered a trial operation phase on Wednesday. (Xinhua)

A train attendant poses next to a high-speed train during its trial operation along the Shangqiu-Hefei-Hangzhou High-speed Railway at Xuancheng Railway Station in Xuancheng, east China's Anhui Province, May 27, 2020. The Hefei-Huzhou section of the Shangqiu-Hefei-Hangzhou High-speed Railway entered a trial operation phase on Wednesday. (Xinhua/Zhang Duan)

Aerial photo taken on May 27, 2020 shows a high-speed train waiting at Anji Railway Station during its trial operation along the Shangqiu-Hefei-Hangzhou High-speed Railway in Huzhou, east China's Zhejiang Province. The Hefei-Huzhou section of the Shangqiu-Hefei-Hangzhou High-speed Railway entered a trial operation phase on Wednesday. (Xinhua/Zhang Duan)

A passenger poses for photos with train attendants in front of a high-speed train during its trial operation along the Shangqiu-Hefei-Hangzhou High-speed Railway at Hefei South Railway Station in Hefei, east China's Anhui Province, May 27, 2020. The Hefei-Huzhou section of the Shangqiu-Hefei-Hangzhou High-speed Railway entered a trial operation phase on Wednesday. (Xinhua/Liu Junxi)