A bullet train runs through a bridge over Wujiang River, a tributary of China's longest river, Yangtze, on the Chongqing-Guiyang line in Zunyi City, southwest China's Guizhou Province, Jan. 25, 2018. A railway connecting Chongqing and Guiyang, two major cities in southwest China, started operation Thursday. Designed for trains running at a speed of 200 km per hour, the 347-km rail line will cut travel time between Chongqing and Guiyang from the current 10 hours to 2 hours, and shorten travel time between Chengdu, capital of Sichuan, and Guiyang from current 11 hours to 3.5 hours. (Xinhua/Liu Xu)