Wu Huan, a mechanic, maintains a bullet train at a bullet train maintaining center in Wuhan, central China's Hubei Province, Jan. 29, 2016. Workers are occupied in the maintenance of bullet trains to keep them in good condition for the Spring Festival travel rush, which kicked off on Jan. 24. Spring Festival, China's most important holiday centering on family reunions, will fall on Feb. 8. (Xinhua/Xiao Yijiu)