Tracklayer witnesses transportation expand in Tibet

More than 15 years ago, Wang volunteered to join the building of the Qinghai-Tibet Railway. It was a tough job, since 85 percent of the railway was constructed in areas more than 4,000 meters above sea level. The areas have an annual average temperature below zero degree Celsius, and oxygen in most of these areas is only about 50 percent to 60 percent of that in plain areas.

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