From Shanghaiist:
In spite of the benefit of being ruled by a “living Buddha,” decades of planning and a cost of billions of dollars, parts of the Beijing-Lhasa railway, China’s “engineering miracle,” are sinking. Specifically, those sections where the project attempts to maintain stability atop the seasonal thawing and refreezing of the permafrost, according to Answers.com, engineers built “elevated tracks with foundations sunk deep into the ground, inserting vertical pipes that circulate liquid nitrogen and cold nitrogen gas into the ground, building hollow concrete pipes beneath the tracks to keep the rail bed frozen, and using metal sun shades.”…[Full Text]
-Read also Underground nitrogen system keeps China moving by Gasworld via Shanghaiist.
