The Soviet SDGPG motor tug Murmansk active on the Danube according to a CIA report dated 10 June 1955

An item dealing with the Danube shipping movements reported that on 27 February 1955 was sighted on the position DKM 1896 the SDGPG (Soviestkoye Dunasikoye Gosudarstvennoye Parokhodstvo) tug ms Murmansk while towing upstream empty tankers and a barge loaded with grain. On the 22th was she sighted at DKM 1895 downstream with loaded tankers, on the 24th on the position DKM 1820 while towing tankers loaded with kerosene bound for Reni.

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