A year and a half before the surrender of the Third Reich in besieged Leningrad, in accordance with the instructions of the Headquarters of the Supreme Commander-in-Chief, the so-called "Victory Map", a plan for the city of Berlin for the Soviet troops, was printed. The top-secret printing house was located in the carriage of an ordinary train; in order to detail the plan, they were looking for any photographs and postcards with views of Berlin.