XI AN, CHINA - JANUARY 07:  (CHINA OUT) Mechanics check a high-speed train at Xi'an Electric Multiple Unit Maintenance Base on January 7, 2014 in Xi An, China. The 40-day 2014 Spring Festival travel rush will start on January 16 as more than 257 million passenger trips will be made on the railways.  (Photo by VCG/VCG via Getty Images)