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

Photo taken on Sept. 12, 2016 shows the completion ceremony of a railway tunnel crossing through the Qinling Mountains in Xi'an, capital of northwest China's Shaanxi Province. 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/Ding Pin)