Yangbajing tunnel

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Coordinates: 30°02′30″N, 90°36′00″E The Yangbajing tunnel is the longest tunnel of some 3,345-meters long of the Qingzang railway (Qinghai–Xizang railway) which links Xining with Lhasa across the high Tibetan Plateau of north-east China. It is 4,264 meters above sea level and located 80 kilometres NW of the Tibetan regional capital, Lhasa.