Unable to answer "What’s the surface here?" – Foot Path – https://osm.org/way/409875874 via StreetComplete 58.0:

This is an access point onto the track, unpaved (grass/gravel) except for rubber matting around the rails. There doesn't seem to be any access to a path on the other side, where there is a fence. This is not the path slightly further north (visible in the second photo), which is mapped correctly

Attached photo(s):
https://westnordost.de/p/237702.jpg
https://westnordost.de/p/237703.jpg