Qingzang railway
The line includes the Tanggula Pass, at 5,072 m (16,640 feet) above sea level the world's highest rail track and Tanggula Railway Station which is the highest railway station. The 1,338 m Fenghuoshan tunnel is the highest rail tunnel in the world, at 4,905 m above sea level. The 3,345-m Yangbajing tunnel is the longest tunnel on the line. It is 4,264 m above sea level, 80 kilometres north-west of Lhasa.