This combo photo shows migrant workers on a train during the Spring Festival travel season for a homeward journey from Guangzhou in south China's Guangdong Province to southwest China's Chongqing Municipality in January of 2000 (top, photo taken by Zhuang Jin); and passengers sitting aboard the bullet train G6102 which departs from the Guangzhou South Railway Station to Wuhan in central China's Hubei Province, on Jan. 25, 2014 (bottom, photo taken by Ding Yong). (Xinhua)