This combo photo shows old-style steam locomotives kept in extended service on the Jining-Tongliao railway in north China's Inner Mongolia Autonomous Region, Dec. 7, 2005 (top, photo taken by Zhang Ling); and bullet trains waiting for maintenance at a train depot in Wuhan, central China's Hubei Province, Jan. 20, 2019 (bottom, photo taken by Xiong Qi). (Xinhua)