High speed goes high altitude

A train passes the construction site of a high-speed railway line linking Lanzhou city and Xinjiang Uygur autonomous region in Zhangye city in Northwest Gansu province, on Nov 18, 2012. The high-speed line will be 1,776 kilometers long crossing the Northwest China's Gansu, Qinghai and Xinjiang and the country's first the high-speed railway in a high altitude areas. Trains on the line are designed to run faster than 200 kilometer per hour. [Photo/Xinhua]

Technicians measures the width of a completed rail base at a section of the new high-speed railway linking Lanzhou city and Xinjiang Uygur autonomous region on Nov 18, 2012. [Photo/Xinhua]