Potsdam Hauptbahnhof

Potsdam Hauptbahnhof is south of the centre, on the other side of the Havel. From Berlin Hauptbahnhof, the RE1 regional takes about 25 minutes; the S7 S-Bahn takes longer but stops at many Berlin stations. From BER airport the RB22 regional arrives, every hour, and continues to Park Sanssouci station, next to the Neues Palais. You need an ABC ticket. From the station, trams and buses go to the centre and the park, and the boat harbour is ten minutes' walk away.