Following the end of the war, normal services resumed except on the Athens leg, where the closure of the border between Yugoslavia and the Kingdom of Greece prevented services from running. That border re-opened in 1951, but the closure of the Bulgarian–Turkish border from 1951 to 1952 prevented services running to Istanbul during that time. As the Iron Curtain fell across Europe, the service continued to run, but the Communist nations increasingly replaced the "Wagon-Lits" cars with carriages run by their own railway services.