On the first Schluchtensteig stage one of the highlights, the bridge of the Sauschwänzle-Bahn as a down-turned truss. There are a few more of these, but they are not visible on the Schluchtensteig, unless in good visibility, e.g. from the Buchberg.
A really great place if you want to watch the historic Sauschwänzlebahn. Up close to the train is a single house. There you have a great view of the train that comes from a tunnel and drives over this bridge.