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Passengers are seen fast asleep aboard train No. K4663 which travels from east China's Shanghai to Chengdu in southwest China's Sichuan Province, early on Jan. 25, 2019. (Xinhua/Ding Ting)

Passengers are seen fast asleep aboard train No. K4663 which travels from east China's Shanghai to Chengdu in southwest China's Sichuan Province, early on Jan. 25, 2019. (Xinhua/Ding Ting)