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7.Xi'an-Chengdu high-speed trains
A bullet train runs through Zhaojialing tunnel during a test run in northwest China's Shaanxi Province, Nov. 22, 2017. High-speed trains linking Xi'an, capital of Shaanxi Province, and Chengdu, capital of Sichuan Province, began operation on Dec. 6, 2017. (Xinhua/Tao Ming)
A bullet train runs through Zhaojialing tunnel during a test run in northwest China's Shaanxi Province, Nov. 22, 2017. High-speed trains linking Xi'an, capital of Shaanxi Province, and Chengdu, capital of Sichuan Province, began operation on Dec. 6, 2017. (Xinhua/Tao Ming)
