Railway workers clean passenger cars for the upcoming "Chunyun" at Kunming, capital of southwest China's Yunnan Province, Jan. 29, 2015. Chunyun is the hectic travel peak surrounding Chinese New Year which falls this year on Feb. 19. This year's Chunyun will begin on Feb. 4 and last until March 16, but many thousands of people have already begun their trek. (Xinhua/Hu Chao)