Aerial views along Xi'an-Chengdu high-speed railway

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)