High-speed trains linking Xi'an and Chongqing begin operation

The bullet train D4252 from Chengdu, capital of southwest China's Sichuan Province, to Xi'an, capital of northwest China's Shaanxi Province, runs on the Jialing River Bridge in Guangyuan City, southwest China's Sichuan Province, Dec. 6, 2017. High-speed rail line linking Xi'an and Chengdu went into operation Wednesday, slashing the travel time between the two cities from about 11 hours to just 4. The 658-kilometer new line is China's first rail route running through the Qinling Mountains, the natural boundary between north and south China. (Xinhua/Jiang Hongjing)