中国桥隧比真高，有一个隧道27公里！这个16公里。

The high-speed railway from Xi 'an to Chengdu(658km), with 127km tunnels crossing the Qinling Mountains(135km). It takes 3-4 hours to arrive, saving 11-12 hours of travel time compared with the old railway.
This is the longest tunnel, 15.99km. pic.twitter.com/ujiXAw2r51

— Sharing travel (@TripInChina) January 14, 2023