The total length is 21.17 kilometers, the first tunnel longer than 20 kilometers on the Chongqing-Kunming High-speed Railway has been completed.

On August 19th, the key project of Chongqing-Kunming high-speed railway - the 21.17 kilometers long Binghui Tunnel, successfully broke through. This is the first super-long tunnel over 20 kilometers in length to be completed on the Chongqing-Kunming high-speed railway, and also the first high-speed railway tunnel in Southwest China to achieve a speed of 350 kilometers per hour over a distance of 20 kilometers or more.