The train G2021, the first one of the high speed railway from Zhengzhou to Lanzhou, arrives at a railway station in Luoyang, central China's Henan Province, July 9, 2017. The high speed railway linking Zhengzhou of Henan and Lanzhou of northwest China's Gansu started operation formally on Sunday. The shortest travel time of the railway between Zhengzhou and Lanzhou was shortened to less than five hours. (Xinhua/Li An)