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Before we begin our journey, let’s learn about this amazing railway. It’s truly one of the great engineering wonders of the 21st century. When it was completed on July 1, 2006, the Tibet Railway set nine world records, including the world’s highest railway at 5,072 metres above sea level, the world’s highest tunnel(隧道)at 4,905 metres, and the longest tunnel ever built on permafrost(凍土).
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