Staff members conduct disinfection work on train in Nanning, Guangxi

Staff members conduct disinfection work on a train at a maintenance base in Nanning, south China's Guangxi Zhuang Autonomous Region, Jan. 20, 2022. China Railway Nanning Group Co., Ltd. has strictly implemented measures on COVID-19 prevention and control during the Spring Festival travel season which kicked off Monday. (Xinhua/Lu Boan)

Staff members conduct disinfection work on a train at a maintenance base in Nanning, south China's Guangxi Zhuang Autonomous Region, Jan. 20, 2022. China Railway Nanning Group Co., Ltd. has strictly implemented measures on COVID-19 prevention and control during the Spring Festival travel season which kicked off Monday. (Xinhua/Lu Boan)

A staff member conducts disinfection work on a train at a maintenance base in Nanning, south China's Guangxi Zhuang Autonomous Region, Jan. 20, 2022. China Railway Nanning Group Co., Ltd. has strictly implemented measures on COVID-19 prevention and control during the Spring Festival travel season which kicked off Monday. (Xinhua/Lu Boan)

Staff members disinfect a bullet train at a maintenance base in Nanning, south China's Guangxi Zhuang Autonomous Region, Jan. 20, 2022. China Railway Nanning Group Co., Ltd. has strictly implemented measures on COVID-19 prevention and control during the Spring Festival travel season which kicked off Monday. (Xinhua/Lu Boan)

Staff members disinfect a bullet train at a maintenance base in Nanning, south China's Guangxi Zhuang Autonomous Region, Jan. 20, 2022. China Railway Nanning Group Co., Ltd. has strictly implemented measures on COVID-19 prevention and control during the Spring Festival travel season which kicked off Monday. (Xinhua/Lu Boan)