Technicians walk past two CRH380A trains at a maintenance center of Guiyang railway section, southwest China's Guizhou Province, June 12, 2015. Railway construction in Guizhou witnessed a rapid development during China's 12th Five-Year Plan period. The province's railway mileage has expanded to over 3,000 kilometers till 2015, including 700 kilometers of high-speed railway. [Photo: Xinhua/Ou Dongqu]