On April 1, 1948, Soviet authorities imposed the first restrictions on Allied road and rail traffic into occupied Berlin, demanding inspection of all military trains entering the Western sectors. The move was a probe of Western resolve amid rising Cold War tensions over currency reform in Germany, and it foreshadowed the full blockade of the city that Stalin would impose just weeks later.
The order came without warning: Soviet checkpoints would now board and search every train, truck, and barge carrying supplies to the roughly two million residents of West Berlin. American and British commanders, caught off guard, faced an immediate choice between compliance and confrontation deep inside Soviet-controlled territory.
General Lucius Clay, the American military governor, refused to accept Soviet inspectors aboard U.S. military trains, and for a tense week armed American guards rode the rails instead. The episode was really a rehearsal: two months later, on June 24, the Soviets would cut off all ground access to Berlin entirely, triggering the eleven-month Berlin Airlift, in which American and British aircraft flew over 2.3 million tons of coal, food, and medicine into the isolated city.
What began as a bureaucratic skirmish over train inspections thus set in motion one of the Cold War's defining confrontations, hardening the division of Germany and Europe for the next four decades.