A train runs on the heat-stick experimental zone of the frozen earth at the Kunlun Mountains pass of the Qinghai-Tibet Railway in Qinghai, northwest China. The railway department adopted measures such as installing heat-sticks and vent-pipes to ensure winter operation of the highest railway in the world.

A train roars on the Qinghai-Tibet Railway at the Kunlun Mountains area.

A train roars on the Qinghai-Tibet Railway at the frozen earth area of Fenghuo Mountain.

(Xinhua News Agency November 28, 2006)