On March 18, customized freight train 81666, fully loaded with deeply processed resin products, departed slowly from Haikou Railway Port Station in Hainan and headed north to Guangzhou International Port in Guangdong province. This marks the operation of the first customized railway freight train following the implementation of full island-wide customs clearance in the Hainan Free Trade Port, adding an efficient and stable logistics corridor between Hainan and Guangdong.