The lower level serves the <a href="https://en.wikipedia.org/wiki/Wannsee_Railway" class="extiw" title="en:Wannsee Railway">en:Wannsee Railway</a> suburben line, and the upper level the <a href="https://en.wikipedia.org/wiki/Berlin_Ringbahn" class="extiw" title="en:Berlin Ringbahn">en:Berlin Ringbahn</a>}, both lines of the <a href="https://en.wikipedia.org/wiki/Berlin_S-Bahn" class="extiw" title="en:Berlin S-Bahn">en:Berlin S-Bahn</a>
Axel Mauruszat
Attribution
<span class="int-own-work" lang="en">Own work</span>