"Zurücktreten bitte", spoken live by the driver, who is at that time out on the platform with a wired microphone, watching the closing doors. On the newer U-Bahn trains, there is a high and low tone for the next
station announcement, with a pre-recorded female voice: "[ding-dong] Nächster Halt – Plärrer – Umsteigemöglichkeit zur Linie
U1. In Fahrtrichtung rechts aussteigen".
Line U2 train departing from Hauptbahnhof station (central station).