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Nie Xinlei, a railway traffic controller of the Chongqing West passenger train depot, checks train signals while working on a summer outdoor shift in southwest China's Chongqing Municipality, Aug. 17, 2019. (Xinhua/Yin Dongxun)
Nie Xinlei, a railway traffic controller of the Chongqing West passenger train depot, checks train signals while working on a summer outdoor shift in southwest China's Chongqing Municipality, Aug. 17, 2019. (Xinhua/Yin Dongxun)