Customs staff members check the first "Qilu" freight train running from Jiaozhou, east China's Shandong province to Baku, capital of Azerbaijan in Jiaozhou, Jan. 31, 2021. A freight train carrying 100 twenty-foot equivalent unit (TEU) containers' goods such as tires and air conditions left Jiaozhou on Sunday, marking the launch of "Qilu" freight train services from Jiaozhou to Baku. (Photo by Xie Hao/Xinhua)

Aerial photo taken on Jan. 31, 2021 shows the first "Qilu" freight train running from Jiaozhou, east China's Shandong province, to Baku, capital of Azerbaijan in Jiaozhou, Jan. 31, 2021. A freight train carrying 100 twenty-foot equivalent unit (TEU) containers' goods such as tires and air conditions left Jiaozhou on Sunday, marking the launch of "Qilu" freight train services from Jiaozhou to Baku. (Photo by Wang Zhaomai/Xinhua)

Customs staff members check the first "Qilu" freight train running from Jiaozhou, east China's Shandong province to Baku, capital of Azerbaijan in Jiaozhou, Jan. 31, 2021. A freight train carrying 100 twenty-foot equivalent unit (TEU) containers' goods such as tires and air conditions left Jiaozhou on Sunday, marking the launch of "Qilu" freight train services from Jiaozhou to Baku. (Photo by Xie Hao/Xinhua)

Aerial photo taken on Jan. 31, 2021 shows the first "Qilu" freight train running from Jiaozhou, east China's Shandong province, to Baku, capital of Azerbaijan in Jiaozhou, Jan. 31, 2021. A freight train carrying 100 twenty-foot equivalent unit (TEU) containers' goods such as tires and air conditions left Jiaozhou on Sunday, marking the launch of "Qilu" freight train services from Jiaozhou to Baku. (Photo by Wang Zhaomai/Xinhua)