Trainer Shen Jie trains a drug dog at a training center for railway police dogs in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, Jan. 10, 2017. Police dogs are allocated to travelling stations during the annual Spring Festival travel rush, when most of the Chinese people return to their hometown for family reunion. The Spring Festival, or Chinese Lunar New Year, falls on Jan. 28 this year.(Xinhua/Peng Zhaozhi)