S21 (Berlin)

S21
S21 route
Overview
Line number6017 Westhafen–Hbf–Potsdamer Platz
6019 Wedding–Hauptbahnhof
Technical
Track gauge1435
Electrification800 V Third rail DC
Route map

Westhafen
Wedding
Perleberger Brücke
Hauptbahnhof
Reichstag
(No longer planned)
Potsdamer Platz
Nord-Süd-Tunnel to Anhalter Bahnhof
Gleisdreieck
from Anhalter Bahnhof
Yorckstraße
Julius-Leber-Brücke
Südkreuz
→ 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.