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

An item dated 12 May 1955 reported the Soviet SDGP (Sovietskoye Dunaisk oye Gosudarstvennoye Parokhodstvo) motor tug Angara on the Danube off DKM 1649 while towing with Pyrites (Russian iron ore)  loaded barges towards Komarno.

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