The Qinghai-Tibet railway, opened this month to great fanfare, is developing surface cracks in its concrete structures while its permafrost foundation is sinking and cracking at some sections.
"The frozen ground that forms the foundation of the railway is sinking and cracking in some sections, making the railway unstable in some places," the Beijing News quoted railway ministry spokesman Wang Yongping as saying. "The concrete is cracking on some of the railway structures and bridges, forming a hidden danger to the railway line quality."
Wang said experts are working on these problems and relevant authorities have taken measures to ensure the safety of the rail and passengers, without specifying these measures. The railway to Lhasa, capital of Tibet Autonomous Region, was opened on July 1. It is dubbed a magnificent engineering feat and a miracle for the world.
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Wang added that shifting sands in the region were also causing greater harm to the railway than expected, while engineers had still not figured out how to keep herds of yaks off the tracks, the report said.
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http://www.chinadaily.com.cn/china/2006-07/28/content_652320.htm