Rolling stock for the new service came to Poland as war reparations from Germany . During the war , Berlin S-Bahn cars were overhauled in the ( then ) German town of Luben to the east of Berlin . When that town , now known as Lubin , was ceded to Poland under the terms of the Potsdam Conference in 1945 , eighty four ( 84 ) S-Bahn cars were in the Luben repair shops . Additional cars were sent to countries east of Germany as war reparations , and while many were sent to Russia , at least 80 two-car sets , and possibly as many as 189 cars , remained in Poland . These cars were allocated to the Tricity region for use on suburban services , and one set is preserved in this condition at a museum at Koscierzyna
Potsdam Conference
Potsdam Conference
Szybka Kolej Miejska (Tricity)