The Soviet SDGP motor tug MS Saratov active on the Danube according to a CIA report dated 10 June 1955

An item dealing with the Danube shipping movements reported that on 22 February 1955 was sighted on the position DKM 1847 the SDGP (Soviestkoye Dunasikoye Gosudarstvennoye Parokhodstvo) tug ms MS Saratov while towing empty rankers downstream.

Source
The report was published on www.archive.org, document number CIA-RDP80-00810A007000090002-6