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 A section of Qinghai-Tibet Railway. [Photo/IC]  | 
Qinghai-Tibet Railway, the longest railway with the highest altitude in the world, finally connected Tibet by rail when it opened to traffic on July 1, 2006.
The 1,956-km line extends from Xining, capital in Northwest China's Qinghai province in the east to Lhasa in the south.
Read more: What has the Qinghai-Tibet Railway contributed to Tibet?