Railway workers perform maintenance on the railway system at the Xiangshawan section of Baotou, Inner Mongolia autonomous region, Dec 14, 2016. More than 40 workers were responsible for maintenance work covering a distance of 247.5 kilometers in Xiangshawan, a section located in the Kubuqi desert. [Photo/Xinhua]

Railway workers perform maintenance on the railway system at the Xiangshawan section of Baotou, Inner Mongolia autonomous region, Dec 14, 2016. More than 40 workers were responsible for maintenance work covering a distance of 247.5 kilometers in Xiangshawan, a section located in the Kubuqi desert. [Photo/Xinhua]

Railway workers perform maintenance on the railway system at the Xiangshawan section of Baotou, Inner Mongolia autonomous region, Dec 14, 2016. More than 40 workers were responsible for maintenance work covering a distance of 247.5 kilometers in Xiangshawan, a section located in the Kubuqi desert.  [Photo/Xinhua]