The S21 and other train lines
The S21 is Berlin’s new north–south S-Bahn line, designed to link the northern ring with Hauptbahnhof and, in later phases, Potsdamer Platz and Südkreuz.
Its first section is expected to open around 2026, improving access to Berlin’s main station and relieving pressure on existing routes.
The Dresdner Bahn project, which runs via Südkreuz toward the south, will provide a fast 20-minute connection between Hauptbahnhof and BER Airport starting in late 2025.
This upgraded line also strengthens the corridor to Dresden, reducing travel time to roughly 75 minutes.
Further south, it will integrate into the planned Dresden–Prague high-speed link, creating a continuous international route through Berlin, BER, Dresden, and Prague.
Together, S21 and the Dresdner Bahn mark a major step toward a more connected and resilient metropolitan rail system for Berlin.