A chef makes pulled noodles for passengers on the Z218 train in northwest China's Gansu Province, Jan. 17, 2017. China's annual Spring Festival travel rush, "Chunyun," is regarded as the largest human migration on earth. Trains have witnessed the migration every year. About 2.98 billion trips are expected to be made during "chunyun" this year that lasts from Jan. 13 to Feb. 21, up slightly from a year ago. Spring Festival, or the Chinese lunar new year, is the most important occasion for family reunions in China. (Xinhua/Chen Bin)
