Workers grind the rails in Wuhan, central China's Hubei Province, Jan. 31, 2018. Workers check the rails 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)