A passenger of G5711, the first high-speed train from Shenzhen to Hong Kong, poses for photos at Shenzhen North Railway Station in Shenzhen City, south China's Guangdong Province, Sept. 23, 2018. Train G5736 left Hong Kong West Kowloon Station at 7:00 on Sunday (1100 GMT Saturday) for Shenzhen North Railway Station. At 6:44, train G5711 left Shenzhen North Railway Station for Hong Kong West Kowloon Station, marking the opening of the Hong Kong section of the Guangzhou-Shenzhen-Hong Kong High-speed Railway and that of the whole Guangzhou-Shenzhen-Hong Kong High-speed Railway. (Xinhua/Mao Siqian)