S1 (Berlin)

• the Prussian Northern Railway, opened on 10 July 1877 and electrified in 1925,
• a short section of the Berlin-Szczecin railway, opened on 1 August 1842 and electrified in 1924,
• the Nord-Süd-Tunnel, opened on 28 May 1936 from Humboldthain to Unter den Linden and on 9 October 1939 to Anhalter Bahnhof and the junction with the Wannsee Railway and
• the Wannsee Railway, opened on 1 June 1874 from Zehlendorf to Wannsee and on 1 October 1891 from Potsdamer Bahnhof to Zehlendorf and electrified on 15 May 1933.

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