paid an annual lump sum () of 50 million Deutsche Marks to the Eastern government, so that transit passengers no longer had to pay tolls individually. Railway Four transit train connections—earlier also called interzonal train ()—connected West Berlin with Hamburg via Schwanheide (E)/Büchen (W) in the North, with Hanover via Marienborn (E)/Helmstedt (W) in the West, with Frankfurt am Main via Gerstungen (E)/Hönebach (W) in the Southwest, and with Nuremberg via Probstzella (E)/Ludwigsstadt (W) in the South of West Germany. These transit trains did not service domestic passengers of East Germany and made stops in East Germany almost exclusively for East German border guards upon entering and leaving the country. Until the construction of the Berlin Wall, interzonal trains would also stop once on their way within East Germany for travellers having a visa for entering or leaving East Germany. Train travel from West Berlin to Czechoslovakia, Denmark (by ferry), Poland and Sweden (by ferry) required a visa to enter East Berlin or East Germany to allow transfer to an international train—which also carried domestic passengers—bound for an international destination. One railway connection between West Berlin and Oebisfelde (E)/Wolfsburg (W) was reserved for freight trains only. In July and August 1945, the three Western Allies and the Soviet Union decided that the railways, previously serviced by the Deutsche Reichsbahn (German Reich Railways), should continue to be operated by one railway administration to service all four sectors. West Berlin had – with the exception of a few small private railway lines – no separate railway administration. Furthermore, the operation of the Reichsbahn's Berlin S-Bahn electric metropolitan transport network, consisting of commuter trains, was also maintained. After the founding of East Germany on 7 October 1949 it gained responsibility for the Reichsbahn in its territory. East Germany continued to run its railways under the official name Deutsche Reichsbahn, which thus maintained responsibility for almost all railway transport in all four sectors of Berlin. The GDR-controlled 'Bahnpolizei', the Reichsbahn's railway police, were authorised to patrol station premises and other railway property in the whole city including West Berlin. The legal necessity of keeping the term 'Deutsche Reichsbahn' explains the surprising use of the word 'Reich' (with its Imperial and Nazi connotations) in the name of an official organisation of the communist GDR. After the Berlin Blockade transit trains () would leave and enter West Berlin only via one line through Berlin-Wannsee railway station