A China-Europe freight train loaded with 6,896 mails arrives at Zhengzhou Station, central China's Henan Province, Feb. 28, 2020. The China-Europe freight train from Hamburg of Germany is the first returning train for International mails since the restoration of its regular operation in November of 2018. (Xinhua/Li An)

A China-Europe freight train loaded with 6,896 mails arrives at Zhengzhou Station, central China's Henan Province, Feb. 28, 2020. The China-Europe freight train from Hamburg of Germany is the first returning train for International mails since the restoration of its regular operation in November of 2018. (Xinhua/Li An)

A China-Europe freight train loaded with 6,896 mails arrives at Zhengzhou Station, central China's Henan Province, Feb. 28, 2020. The China-Europe freight train from Hamburg of Germany is the first returning train for International mails since the restoration of its regular operation in November of 2018. (Xinhua/Li An)