Layover in Berlin: street food, Wall history, and Mitte under 40 minutes from BER.
Airport Express (FEX) to Berlin Hauptbahnhof in 23 min, every 15 min, €5 ABC-zone ticket. RE7 and RB14 regional trains use the same route and ticket. S-Bahn S9 and S45 reach the city in 45 to 50 min at the same price.