A bullet train runs on a bridge of Xi'an-Chengdu high-speed railway during a test in northwest China's Shaanxi Province, Nov. 1, 2017. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Tang Zhenjiang)
A bullet train arrives at Epang Palace Station of Xi'an-Chengdu high-speed railway in northwest China's Shaanxi Province, Sept. 20, 2017. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Tang Zhenjiang)
A bullet train is seen at Jianmenguan Station of Xi'an-Chengdu high-speed railway in Guangyuan, southwest China's Sichuan Province, Nov. 25, 2017. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Xue Yubin)
Photo taken on March 30, 2017 shows Wangjiaba Bridge of Xi'an-Chengdu high-speed railway in southwest China's Sichuan Province. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Xue Yubin)
A bullet train runs on a bridge of Xi'an-Chengdu high-speed railway during a test in northwest China's Shaanxi Province, Nov. 26, 2017. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Wang Shutian)
Photo taken on May 11, 2017 shows Hanzhong Railway Station of Xi'an-Chengdu high-speed railway in northwest China's Shaanxi Province. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Tao Ming)
A bullet train is seen at Ningqiang South Railway Station of Xi'an-Chengdu high-speed railway during a test in northwest China's Shaanxi Province, Oct. 26, 2017. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Liang Aiping)
Photo taken on March 29, 2017 shows Majiaba Bridge of Xi'an-Chengdu high-speed railway in Jiangyou, southwest China's Sichuan Province. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Xue Yubin)
A bullet train runs on a bridge of Xi'an-Chengdu high-speed railway during a test in northwest China's Shaanxi Province, Nov. 22, 2017. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Tang Zhenjiang)
A bullet train runs on Jialing River Bridge of Xi'an-Chengdu high-speed railway during a test in southwest China's Sichuan Province, Nov. 26, 2017. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Xue Yubin)
Photo taken on Sept. 21, 2017 shows Yangxian West Station of Xi'an-Chengdu high-speed railway in Hanzhong, northwest China's Shaanxi Province. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Tang Zhenjiang)
Photo taken on Nov. 25, 2017 shows Foping Railway Station of Xi'an-Chengdu high-speed railway in northwest China's Shaanxi Province. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Tao Ming)
A bullet train runs on Renjiashan Bridge of Xi'an-Chengdu high-speed railway during a simulated run in northwest China's Shaanxi Province, Nov. 22, 2017. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. (Xinhua/Tao Ming)