First tunnel of Chongqing-Wanzhou High-Speed Railway holed through

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The Zhangjiacun Tunnel of the Chongqing-Wanzhou High-Speed Railway has been successfully bored through. It is a single-tube, double-track tunnel with a designed speed of 350 kilometers per hour. With a length of 250.91 kilometers, the railway connects Chongqing East Station and Wanzhou District in southwest China's Chongqing Municipality.