First Section of Berlin S-Bahn Opens

On June 12, 1906, the first electrified section of what would become the Berlin S-Bahn commenced operations between Stettiner Bahnhof and Bernau. This marked a pivotal shift from steam to third-rail electric traction on the Prussian Eastern Railway network. Engineers overcame challenges of integrating suburban lines with urban terminals, using 750-volt DC systems that allowed frequent, clean service. The project reflected Germany's rapid industrialization and urban growth before World War I. Key figures included engineers from Siemens and AEG who supplied the rolling stock. The S-Bahn's opening improved connectivity for Berlin's expanding population and set standards for metropolitan rail systems worldwide. Its legacy endures in today's extensive network, which survived division and reunification of the city.