S21 (Berlin)

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S21
S21 route
Overview
Line number	6017 Westhafen–Hbf–Potsdamer Platz 6019 Wedding–Hauptbahnhof
Technical
Track gauge	1435
Electrification	800 V Third rail DC
Route map Legend Northern circular Westhafen Wedding Berlin-Spandau Ship Canal Perleberger Brücke Hauptbahnhof Spree Reichstag (No longer planned) Nord-Süd-Tunnel from Brandenburger Tor Potsdamer Platz Nord-Süd-Tunnel to Anhalter Bahnhof Landwehr Canal Gleisdreieck from Anhalter Bahnhof Yorckstraße Anhalter Vorortbahn to Südkreuz Julius-Leber-Brücke Wannseebahn to Schöneberg Southern circular Südkreuz Southern circular → First section → Second section → Third section

S21 is a planned second north-south route for the Berlin S-Bahn, which will connect Berlin Hauptbahnhof to the Berlin Ringbahn to both north and south. The first section is under construction and is expected to go into operation in the first quarter of 2025.^[1]