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A staff member in charge of security stands on duty on a subway train of Yanfang Line in Beijing, capital of China, June 15, 2017. The Yanfang Line of Beijing Subway will be operational by the end of 2017 with fully autopilot system. [Photo/Xinhua]
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Staff members work in a control room of Yanfang Line in Beijing, capital of China, June 15, 2017. [Photo/Xinhua]
