Foreign volunteers serve passengers during Spring Festival travel rush in China's Xi'an (5)

Foreign volunteers receive professional training at Xi'an North Railway Station in Xi'an, capital of northwest China's Shaanxi Province, Jan. 20, 2019. Three foreign student volunteers from Xi'an Jiaotong University came to Xi'an North Railway Station on Sunday to familiarize themselves with the train staff members' work. They would serve passengers during the Spring Festival travel rush. The Spring Festival, or the Year of the Pig in the Chinese lunar calendar, will begin on Feb. 5 this year. The 40-day 2019 Spring Festival travel rush started on Jan. 21, with 3 billion trips expected to be made. (Xinhua/Tang Zhenjiang)