Originally Posted by
jreichel
Be advised, though, that you can't board or deboard at Bonn HBF. The Express Rail trains (formerly AIRail) coming from Köln stop at a station called Siegburg/Bonn! You'll need a separate ticket for the S-Bahn and/or tram for the short hop between Siegburg/Bonn and your final destination.
Thanks very much, I didn't know that! The S-Bahn-net is a very useful relic of the old capital city status, and will come in handy.