Train No. X8151, a China-Europe freight train, leaves from Xi'an International Port in Xi'an, northwest China's Shaanxi Province, Nov. 23, 2022. The train No. X8151, fully loaded with home appliances products, departed from Xi'an to Europe on Wednesday, marking the 4,000th trip of China-Europe freight train made from Shaanxi in 2022. [Photo by Li Yibo/Xinhua]

This aerial photo taken on Nov. 23, 2022 shows the train No. X8151, a China-Europe freight train, getting ready to leave from Xi'an International Port in Xi'an, northwest China's Shaanxi Province. The train No. X8151, fully loaded with home appliances products, departed from Xi'an to Europe on Wednesday, marking the 4,000th trip of China-Europe freight train made from Shaanxi in 2022. [Photo by Li Yibo/Xinhua]

Train No. X8151, a China-Europe freight train, gets ready to leave from Xi'an International Port in Xi'an, northwest China's Shaanxi Province, Nov. 23, 2022. The train No. X8151, fully loaded with home appliances products, departed from Xi'an to Europe on Wednesday, marking the 4,000th trip of China-Europe freight train made from Shaanxi in 2022. [Photo by Li Yibo/Xinhua]

Train No. X8151, a China-Europe freight train, gets ready to leave from Xi'an International Port in Xi'an, northwest China's Shaanxi Province, Nov. 23, 2022. The train No. X8151, fully loaded with home appliances products, departed from Xi'an to Europe on Wednesday, marking the 4,000th trip of China-Europe freight train made from Shaanxi in 2022. [Photo by Li Yibo/Xinhua]

Train No. X8151, a China-Europe freight train, gets ready to leave from Xi'an International Port in Xi'an, northwest China's Shaanxi Province, Nov. 23, 2022. The train No. X8151, fully loaded with home appliances products, departed from Xi'an to Europe on Wednesday, marking the 4,000th trip of China-Europe freight train made from Shaanxi in 2022. [Photo by Li Yibo/Xinhua]