Conductor Zhang Guoying waves on a bullet train to run in a trial operation on the Baoji-Lanzhou high-speed railway at the Tianshui South Railway Station in Northwest China's Gansu province, May 19, 2017. The 401-km railway line linking Baoji of Northwest China's Shaanxi province and Lanzhou in neighboring Gansu province has started test runs. [Photo/Xinhua]
Photo taken on May 19, 2017 shows a bullet train running in a trial operation on the Weihe River Bridge of the Baoji-Lanzhou high-speed railway in Northwest China's Gansu province. [Photo/Xinhua]
