Gremmelsbacher Tunnel

Here the Black Forest Railway is crossed under a pedestrian tunnel. Together with a Bächle. That alone is an experience.
At the tunnel portal there is a platform from which you can see the train coming out of the tunnel from close up.

A special experience is the sensory perception of the path. This station sensitizes the user to listen consciously in the pedestrian tunnel and directly on the railway line at the Gremmelsbacher Tunnel. In the original telephone, the sounds of a steam locomotive, a diesel locomotive and an electric locomotive, among others, can be called up at the push of a button.
Source: schwarzwaldbahn-erlebnispfad.de/index.php?id=283

Station 5: Gremmelsbach Tunnel
The sensory perception of the path is a special experience. This station encourages users to listen consciously in the pedestrian tunnel and directly along the railway line at the Gremmelsbach Tunnel. At the touch of a button on the original telephone, the sounds of a steam locomotive, a diesel locomotive, and an electric locomotive can be accessed.Excerpt from the information panels at this station:
Experience the railway - with all your senses - At the source of the small stream, you can perceive a wide range of sounds. From the silence of the forest on a cool winter day to the unexpected thunder of a freight train, which causes the interior of the small pedestrian tunnel to vibrate. It's also surprising how quietly modern double-decker carriages pass by without much noise, disappearing into the tunnel, or emerging from the tunnel suddenly and barely audibly...