College students of the Tibetan ethnic group chat on a train running from Lanzhou, capital of northwest China's Gansu Province, to Lhasa, capital of southwest China's Tibet Autonomous Region, on the Qinghai-Tibet Raiwlay.

A college student (C) of the Tibetan ethnic group signs his autograph in the Tibetan language for a passenger on a train running from Lanzhou, capital of northwest China's Gansu Province, to Lhasa, capital of southwest China's Tibet Autonomous Region, on the Qinghai-Tibet Raiwlay. The Qinghai-Tibet Railway, the highest railroad in the world, was put into use on July 1.