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); 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/Xinhua]