It is longest tunnel on the line from Goldmod to Lhasa, and part of one of the highest railways in the world,  The highest rail tunnel in the world is the 1,338 m Fenghuoshan tunnel which is situated at 4,905 m above sea level, and called "the nearest door to the heaven." This railroad totals a combined length of 160 km of 675 bridges.
The longest tunnel on the line from Goldmod to Lhasa, and part of one of the highest railways in the world,  The highest rail tunnel in the world is the 1,338 m Fenghuoshan tunnel which is situated at 4,905 m above sea level, and called "the nearest door to the heaven." This railroad totals a combined length of 160 km of 675 bridges.