Two brand new CR300BF Fuxing (Rejuvenation) bullet trains stand at a depot of China Railway Xi'an Group Co., Ltd. in Xi'an, northwest China's Shaanxi Province, Dec. 15, 2020. The CR300BF Fuxing (Rejuvenation) bullet train, a new addition to the Fuxing bullet train family, will be put into service on the railway linking Yinchuan and Xi'an. (Photos: Xinhua/Li Yibo)

A brand new CR300BF Fuxing (Rejuvenation) bullet train arrives at a depot of China Railway Xi'an Group Co., Ltd. in Xi'an, northwest China's Shaanxi Province, Dec. 15, 2020.

Staff members check the new CR300BF Fuxing (Rejuvenation) bullet train at a depot of China Railway Xi'an Group Co., Ltd. in Xi'an, northwest China's Shaanxi Province, Dec. 15, 2020.

Staff members check the new CR300BF Fuxing (Rejuvenation) bullet train at a depot of China Railway Xi'an Group Co., Ltd. in Xi'an, northwest China's Shaanxi Province, Dec. 15, 2020.

A brand new CR300BF Fuxing (Rejuvenation) bullet train arrives at a depot of China Railway Xi'an Group Co., Ltd. in Xi'an, northwest China's Shaanxi Province, Dec. 15, 2020.

Two brand new CR300BF Fuxing (Rejuvenation) bullet trains stand at a depot of China Railway Xi'an Group Co., Ltd. in Xi'an, northwest China's Shaanxi Province, Dec. 15, 2020.