Yugoslavian JRB (steam tug Srbija sighted on the Danube according to a CIA report dated 29 March 1955

An item dated 31 December 1954 reported the JRB (Jugoslovensko Recno Brodarstvo) steam tug Srbija sighted on the Danube kilometre marker 1880 towing upstream barges loaded with wood.

Source
The report was published on www.archive.org, document number CIA-RDP80-00810A006200800008-0