Introduction of Yangbajing Tunnel?

Yangbajing Tunnel, consisting of Yangbajing No.1 Tunnel and No.2 Tunnel, lives on steep and turbulent winding roads on both sides and is surrounded by endless mountains. Among them, tunnel 1 is the longest plateau tunnel on the Qinghai-Tibet Railway with a total length of 3,345 meters, with an altitude of 4,200 meters, and is known as "the longest tunnel on the roof of the world"; The Yangbajing/KOOC-0/Tunnel officially broke ground in 2006/KOOC-0/October/KOOC-0/day, and was completed in 2003/KOOC-0/October/KOOC-0/2. The total length of No.2 tunnel is 1 643m, which is adjacent to1tunnel. Yangba No.2 Tunnel was officially started on 10+0/0 on October 8, 2006, and was completed on September 6, 2003.