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

Workers work at the construction site of Fuchuan Tunnel of Xi'an-Chengdu Passenger Railway in Hanzhong, northwest China's Shaanxi, Feb. 29, 2016. The 643-km line 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/Li Zhihao)