Where in the wider Frankfurt am Main area is this (closed?) railway bridge?

In the film Live (2020) (alternate link including stream), after about 1 hour 9 minutes, there is a scene on a railway bridge that is part of what is probably a museum/heritage narrow-gauge railway, or abandoned altogether. Most of the rest of the film is shot in the vicinity of Frankfurt am Main, Germany, so this shot probably is too. Other shots just before this scene contain a tunnel with tracks still present. Where is it?

Unfortunately, the shot is at night, but this being a nuit américaine some shapes can still be recognised, probably enough to identify it for someone knowing the place.

This is a still from the film at 01:08:49 (click for a larger version):

The other nearby shot, apparently in a tunnel, perhaps from the same railway (at 01:06:44):