A passenger buys high-speed sleeper train tickets for Shanghai at a ticket office of Hong Kong West Kowloon Station in Hong Kong, south China, June 5, 2024. High-speed sleeper trains linking Beijing and Shanghai with Hong Kong will commence operations on June 15, facilitating personnel exchanges between the Chinese mainland and Hong Kong, the China State Railway Group Co., Ltd. (China Railway) said on Tuesday. Ticket sales for the high-speed sleeper trains opened on Wednesday. (Xinhua/Chen Duo)