A staff member of China Railway Nanning Group Co., Ltd. conducts disinfection work on a train in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus. (Photos: Xinhua)

Staff members of China Railway Nanning Group Co., Ltd. conduct disinfection work on a train in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

Staff members of China Railway Nanning Group Co., Ltd. conduct disinfection work on a train in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

A staff member of China Railway Nanning Group Co., Ltd. conducts disinfection work on a train in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

A staff member of China Railway Nanning Group Co., Ltd. puts on protective suit before conducting disinfection work in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

A staff member of China Railway Nanning Group Co., Ltd. conducts disinfection work for a train in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

A staff member of China Railway Nanning Group Co., Ltd. puts on protective suit before conducting disinfection work in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

Staff members of China Railway Nanning Group Co., Ltd. walk to bullet trains for disinfection work in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

Staff members of China Railway Nanning Group Co., Ltd. put on protective suits before conducting disinfection work in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

Staff members of China Railway Nanning Group Co., Ltd. walk out of bullet trains after disinfection work in Nanning, south China's Guangxi Zhuang Autonomous Region, Feb. 6, 2020. China Railway Nanning Group Co., Ltd. conducts disinfection operations every day on the trains to help prevent and control the spread of the novel coronavirus.

A staff member records the disinfection work on a train in Xi'an, northwest China's Shaanxi Province, Feb. 6, 2020. China Railway Xi'an Group Co., Ltd conducts disinfection operations on the trains in an effort to curb the spread of the novel coronavirus.

A staff member conducts disinfection work for a train in Xi'an, northwest China's Shaanxi Province, Feb. 6, 2020. China Railway Xi'an Group Co., Ltd conducts disinfection operations on the trains in an effort to curb the spread of the novel coronavirus.

A staff member prepares to conduct disinfection work for a train in Xi'an, northwest China's Shaanxi Province, Feb. 6, 2020. China Railway Xi'an Group Co., Ltd conducts disinfection operations on the trains in an effort to curb the spread of the novel coronavirus.

A staff member conducts disinfection work for a train in Xi'an, northwest China's Shaanxi Province, Feb. 6, 2020. China Railway Xi'an Group Co., Ltd conducts disinfection operations on the trains in an effort to curb the spread of the novel coronavirus.

A staff member conducts disinfection work for a train in Xi'an, northwest China's Shaanxi Province, Feb. 6, 2020. China Railway Xi'an Group Co., Ltd conducts disinfection operations on the trains in an effort to curb the spread of the novel coronavirus.

A staff member conducts disinfection work for a train in Xi'an, northwest China's Shaanxi Province, Feb. 6, 2020. China Railway Xi'an Group Co., Ltd conducts disinfection operations on the trains in an effort to curb the spread of the novel coronavirus.