The main rail and autobahn route between West Germany and Berlin, across the GDR, began at the Helmstedt–Marienborn border crossing, also known as Checkpoint Alpha.
Peamine raudtee ja Autobahn Lääne-Saksamaa ja Berliini vahel, läbi Ida-Saksamaa, algas Helmstedt–Marienborni piiripunktist, tuntud ka kui Checkpoint Alpha.