S26_(Berlin)
The S26 is a service of the Berlin S-Bahn. It runs from Teltow in the district (Kreis) of Potsdam-Mittelmark via Südkreuz, through the Berlin Nord-Süd Tunnel with a stop at Friedrichstraße, and ends in Blankenburg in the borough of Pankow. On weekends the S26 runs from Teltow to Potsdamer Platz.[1] The current service began operation in December 2017.
Trains on this line run every 20 minutes. This interval is in sections shortened to a 10-minute interval by the S25. There is no night service on this line.