A combo photo shows the workers checking the steam locomotives in Nanning in 1994(up) and a worker checking the bullet train in Nanning, Feb. 20, 2014, south China's Guangxi Zhuang Autonomous Region. The total mileage of railway lines in Guangxi Zhuang Autonomous Region has reached 5,191 km from 1,346.3 km in 1958. The railway has become a transportation artery and brought economic opportunities to Guangxi. (Xinhua)