The high speed motor barges of the Czechoslovak Elbe Navigation Company according to a CIA report dated 30 July 1951

An item reported that the Czechoslovak Elbe Navigation Company, Prague, Czechoslovakia operated the high speed motor barges Vaclav, Karel IV, Otakar, Ludmila and Pionyr with a crew numbering 6 men and a tonnage of 4590500 tons.

Source
The report was published on www.archive.org, document number CIA-RDP82-00457R008200260013-3