The Soviet SDGP motor tug Balkas active on the Danube according to a CIA report dated 29 June 1955

An item dated 13 May 1955 reported the Soviet SDGP (Sovietskoye Dunaisk oye Gosudarstvennoye Parokhodstvo) motor tug Balkas on the Danube off Szob while towing empty barges downstream.

Source
The report was published on www.archive.org, document number CIA-RDP80-00810A007200560007-7