S3 (Berlin)
S3 is a line on the Berlin S-Bahn. It operates from Erkner to Spandau.
S3 originally was shortened to Ostbahnhof from 2003 to 2009 while awaiting renovation works. To compensate for the diminished throughput on the Stadtbahn, the was extended westwards to Spandau. Then, it temporarily shortened to Ostkreuz.
