

The “Sky Train”, “Lhasa Express”, “Rocket to the rooftop of the world”, “World’s highest railway”; regardless of what its called, The Qinghai-Tibet train is truly an engineering wonder. Taking 47 hours to travel from Beijing to Lhasa the train crosses 675 bridges on a 4064km journey.
The Golmud-to-Lhasa sector offers the most breath-taking scenery. That segment also offers the record-breakers: the world’s highest passenger railroad (at Tanggula Pass – elevation: 16,640 ft.; 5072m) and the world’s highest railroad tunnel (Fenghuoshan – elevation: 16,093 ft.; 4905m). Over 80% of the journey is at altitudes above 13,000 feet; fully half the track on this sector was laid on top of permafrost.
Some great pictures can be seen as well as maps of the route on http://www.tibettraintravel.com.