Workers are digging a tunnel of the Beijing-Zhangjiakou high-speed railway line’s branch linking Chongli county, Zhangjiakou, Hebei province, on June 30, 2017. [Photo/Xinhua] Chinese workers are building the world’s deepest and Asia’s largest underground high-speed railway station beneath the Great Wall at the Badaling section in Beijing. The station under construction will be 3-story high and…

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