Engineers conduct maintenance and patrol in Qingliangshan Tu

Gao Yuefei, serving as a signalman, conducts maintenance in Zhifang No. 1 Tunnel, in Xi'an, capital city of northwest China's Shaanxi Province on Feb. 28, 2019. Xi'an-Chengdu high-speed railway is China's first rail route running through the Qinling Mountains, the natural boundary between north and south China. Maintenance is conducted only at night or early in the morning when all trains stop services to guarantee the smooth and safe operation. (Xinhua/Li Yibo)

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61 [ Editor: Zhang Zhou ]