Maintenance workers for the electricity system of subway work in the tunnel in east China's Shanghai Municipality, July 14, 2017. The daily passenger flow of Shanghai subway surpassed 10 million recently. High temperature and staying up late in the midnight are both challenges facing maintenance workers of the subway system. (Xinhua/Ding Ting)
Maintenance workers patrol in Shanghai subway tunnel
Source: Xinhua| 2017-07-14 22:05:12|Editor: Xiang Bo
KEY WORDS: subway
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