An item dated 26 June 1954 reported that the Bulgarian tug Svishtov left Budapest-Csepel, Hungary bound for Bulgaria while towing a barge with a cargo rails and around 40 new trucks loaded at Csepel and a barge loaded with rails and tractors coming from Bratislava, Czechoslovakia [nowadays Slovakia].
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A005300910008-8
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A005300910008-8