A staff member works yesterday on a train during a trial operation of the high-speed railway linking Chongqing in Southwest China and Zhengzhou, capital of Central China’s Henan Province. The Zhengzhou-Chongqing railway will be fully operational in late June, cutting the travel time between the two cities from 8 hours to 4 hours and upgrading the high-speed railway network in Central China and Southwest China. Xinhua