30-09-1865: Railway link Hamburg - Altona via Dammtor
05-12-1906: Suburban service Blankenese - Ohlsdorf
01-10-1907: Electric suburban service Blankenese - Ohlsdorf [> S1/S11]
12-03-1924: Ohlsdorf - Poppenbüttel [> S1/S11]
14-05-1950: Blankenese - Sülldorf [> S1]
20-05-1954: Sülldorf - Wedel [> S1]
01-06-1958: Berliner Tor - Bergedorf [> S21/S2]
04-10-1959: Berliner Tor - Hauptbahnhof ( - Altona) [> S21/S2]
22-02-1962: Holstenstraße - Langenfelde [> S21/S3]
26-05-1965: Langenfelde - Elbgaustraße [> S21/S3]
22-09-1967: Elbgaustraße - Pinneberg [> S21/S3]
01-06-1969: Bergedorf - Aumühle [S2]
30-05-1975: Hauptbahnhof - Landungsbrücken "City S-Bahn" [S10]
18-04-1979: Landungsbrücken - Altona (incl. new Altona underground station) [S1, S3]
31-05-1981: Altona - Diebsteich link [S3]
25-09-1983: Hauptbahnhof - Harburg Rathaus [S3, S31]
04-08-1984: Harburg Rathaus - Neugraben [S3]
29-05-1994: Bergedorf - Aumühle closed [S21] due to reconstruction of Hamburg-Berlin main line
01-06-1997: Bergedorf - Reinbek reopened [S21]
30-05-1999: Allermöhe station added [S21]
26-05-2002: Reinbek - Aumühle reopened [S21]
09-12-2007: Neugraben - Stade (dual-system trains) [S3]
12-12-2008: Ohlsdorf - Hamburg Airport (Flughafen) [S1]
15-12-2019: Elbbrücken station added [S3/S31]
31-05-2023: Ottensen station added [S1/S11]
10-12-2023: network restructured and S5 introduced
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