The Tanggula (Dangla) Railway Station in Tibet is the world's highest railway station. The station is located at 5,068 metres (16,627 ft) above sea level, surpassing Ticlio (Peru), at 4,829 metres (15,843 ft), Cóndor station, at 4,786 metres (15,702 ft), on the Rio Mulatos-Potosí line in Bolivia, and La Galera station at 4,781 metres (15,686 ft) in Peru.

It is no more than 1 kilometre away from the highest point of rail track at 5,072 metres (16,640 ft). The station is 1.25 kilometres (4,100 ft) long and covers 77,002 square metres (19.028 acres). The location of the station was specially chosen for the view from the platform.

The railway station has three tracks, one of them served by a platform, and another one served by a very short sub-platform. This unstaffed station on the Qingzang railway opened for service on July 1, 2006. The station is unstaffed because of oxygen shortage in the air. The air in Tibet is much thinner, with oxygen partial pressure being 35% to 40% below that at sea level. Special passenger carriages are used, and several oxygen factories were built along the railway. Each seat in the train is equipped with an oxygen supply outlet for any possible emergency.

More Info: en.wikipedia.org