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 counter-clockwise.
See also
*
Line S4
References
{{DEFAULTSORT:S4x (Berlin)
Berlin S-Bahn lines
de:Berliner Ringbahn#S-Bahn