Attendant He Meng (L) puts on a sticker for a child in case of getting lost aboard G1655 bullet train from east China's Shanghai to Xiamen, southeast China's Fujian Province, June 30, 2019. China's railway will see summer peak season from July 1 to August 31. (Xinhua/Chen Fei)

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Attendant He Meng (R) explains the tips for travel safety to children aboard the G1655 bullet train from east China's Shanghai to Xiamen, southeast China's Fujian Province, June 30, 2019. China's railway will see summer peak season from July 1 to August 31. (Xinhua/Chen Fei)