3 ms·

Actually I don't think it is 100% known what the "S" stands for. I think "Stadtschnellbahn" is most likely. The "Stadtbahn" only refers to the east-west route.

• poelzi 11y ago
  maybe its like SOS and stands for nothing, at least at the beginning. It was used because it was easy to morse and not used ;)
• erikb 11y ago
  Good to know, because many towns have that I thought it's really Stadt-Bahn. Didn't know S5/7/75 have that special name.