Workers cover the new rails to control the temperature in the Zhangye section of the high-speed railway linking Lanzhou city and Xinjiang Uygur autonomous region. 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]