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

An item dated 14 May 1955 reported the Soviet SDGP (Sovietskoye Dunaisk oye Gosudarstvennoye Parokhodstvo) motor tug Orel on the Danube off the DKM 1880 while towing new sea going barges and one rebuilt barge downstream.

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