Why the Qinghai-Xizang Railway is called a miracle
#MegaProject Permafrost. Thin air. Extreme cold. At 4,800 meters on the Qinghai-Xizang Plateau, we finally understood why the Qinghai-Xizang Railway is called a miracle. For 20 years, this "heavenly road" has crossed snow-capped mountains and uninhabited lands. Yet its greatest challenge may lie beneath the tracks: invisible permafrost that can shift when it thaws. How was the world's highest railway built on such fragile ground? Follow Liz across the "roof of the world" to find out. #QinghaiXizangRailway #PathToGlory
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