One of the locations in the forest around Winden is a railway track in the forest. It runs through a slight depression and under an overpass, and must be in the vicinity of the cave entrance.
The (single-direction) track is featured repeatedly as a meeting place of the youths in 2019. At that time, the track is grown over with vegetation, as if it had been out of service for several years.
Do we ever observe a timeframe where this track is used, or do we have to assume it was both built and decommissioned some time in between one of the 33-year intervals?
EDIT: To be clear, it is fully possible the railway tracks are irrelevant and just serve to establish a given place. On the other hand, Dark is a series where small details matter and where the same places and people are shown across several time frames, so seeing something that is derelict at one point makes me wonder whether it used to have any significance at an earlier time.