Aerial photo shows a train ferry carrying train cabins with passengers inside leaves the Nangang Port in Haikou, capital of south China's Hainan Province, Jan. 31, 2019. Some people back home to Hainan Province during the Spring Festival travel rush take the Yuehai Railway Line. The Yuehai Railway Line, as the first cross-sea rail line in China, connects the island province of Hainan with Guangdong on the mainland by train ferry, a ferry carrying the detached train carriages across the sea. (Xinhua/Guo Cheng)