Worker Kang Chaohua (L) checks the rail with his colleague in Wuhan, central China's Hubei Province, Jan. 31, 2018. Workers check the rail to guarantee transportation safety. The 2018 Spring Festival travel rush, known as the Chunyun, started on Feb. 1 and will last till March 12. About 2.98 billion trips are expected to be made during the Chunyun. (Xinhua/Xiong Qi)