Worker Song Daoguo feeds water to train G8531 at the Chengdu East Station in Chengdu, capital of southwest China's Sichuan Province, Jan. 21, 2017. China sees the Spring Festival travel rush between Jan. 13 and Feb. 21 as many people go home for family reunions. (Xinhua/Liu Kun)

A working staff member sees the train C6304 off at Deyang Station in Chengdu, capital of southwest China's Sichuan Province, Jan. 25, 2017. China sees the Spring Festival travel rush between Jan. 13 and Feb. 21 as many people go home for family reunions. (Xinhua/Liu Kun)

Deputy conductor Yang Li uses mobile phone to contact with her family after the light is turned off on the train T8898 from Guiyang, capital of southwest China's Guizhou Province, to Chengdu, capital of southwest China's Sichuan Province, Jan. 18, 2017. China sees the Spring Festival travel rush between Jan. 13 and Feb. 21 as many people go home for family reunions. (Xinhua/Liu Kun)

Workers patrol in a karst cave under the Xiazi River tunnel where a train is running in Zunyi, southwest China's Guizhou Province, Jan. 19, 2017. China sees the Spring Festival travel rush between Jan. 13 and Feb. 21 as many people go home for family reunions. (Xinhua/Liu Kun)