Aerial photo shows the construction site of Liquan section of Yinchuan-Xi'an high speed railway in northwest China's Shaanxi Province, Feb. 26, 2020. The track laying of Liquan section of the railway is resumed amid epidemic control efforts in Shaanxi. (Xinhua/Zhang Bowen)

A worker inspects the equipment at the construction site of Liquan section of Yinchuan-Xi'an high speed railway in northwest China's Shaanxi Province, Feb. 26, 2020. The track laying of Liquan section of the railway is resumed amid epidemic control efforts in Shaanxi. (Xinhua/Zhang Bowen)

A man works at the construction site of Liquan section of Yinchuan-Xi'an high speed railway in northwest China's Shaanxi Province, Feb. 26, 2020. The track laying of Liquan section of the railway is resumed amid epidemic control efforts in Shaanxi. (Xinhua/Zhang Bowen)

Workers conduct measuring work at the construction site of Liquan section of Yinchuan-Xi'an high speed railway in northwest China's Shaanxi Province, Feb. 26, 2020. The track laying of Liquan section of the railway is resumed amid epidemic control efforts in Shaanxi. (Xinhua/Zhang Bowen)

People work at the construction site of Liquan section of Yinchuan-Xi'an high speed railway in northwest China's Shaanxi Province, Feb. 26, 2020. The track laying of Liquan section of the railway is resumed amid epidemic control efforts in Shaanxi. (Xinhua/Zhang Bowen)