S41 and S42 operate a circular service on the Ringbahn and are part of the Berlin S-Bahn. The S41 operates clockwise around the circle, the S42 operates
July 1871 from Moabit through Gesundbrunnen, Central-Viehhof (now StorkowerStraße), Stralau-Rummelsburg (now Ostkreuz), Rixdorf (now Neukölln) and Schöneberg
couldn't use the West Berlin north–south route and the Southern leg of the pre- and post-Wall Ringbahn was in West Berlin. Lines S41 and S42 continuously