CNR network Xining July 20 news (reporter Ge and far) July 19, known as the world's highest railway permafrost tunnel - Tibet railway tunnel for laying CWR Fenghuoshan, marking the Qinghai-Tibet railway permafrost soil conservation line yielded good results.
    Located in the hinterland of the Qinghai-Tibet plateau railway tunnel Fenghuoshan, sector between Kunlun Mountains and Tanggula, length of 1338 meters, with an average elevation of 4,905 meters of rail, inland tunnel only 40% oxygen. Tunnel in the body all in permafrost, frozen rocks, geological strata complex set of frozen soil, rich frozen soils, fractured ice, mud and other harsh sandstone geology in one.