Have a look at China's Xi'an-Chengdu Passenger Railway

A bullet train runs through the Qinling Mountains during a test run on a high-speed railway linking Xi'an of northwest China's Shaanxi Province with Chengdu of southwest China's Sichuan Province, Nov. 22, 2017. The 643-km Xi'an-Chengdu Passenger Railway is China's first rail route to run through the Qinling Mountains. With a designed speed of 250 km per hour, it will slash the travel time between the two cities from the previous 16 hours. (Xinhua/Tang Zhenjiang)