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In page Tibet Autonomous Region:

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The Qinghai–Tibet Railway from Golmud to Lhasa was completed on October 12, 2005. It opened to regular trial service on July 1, 2006. Five pairs of passenger trains run between Golmud and Lhasa, with connections onward to Beijing, Chengdu, Chongqing, Guangzhou, Shanghai, Xining and Lanzhou. The line includes the Tanggula Pass, which, at 5,072 m (16,640 ft) above sea level, is the world's highest railway.[citation needed]