Unable to answer "Is there a shelter at this stop?" – 3 (Train Platform) – https://osm.org/way/1154283108 via StreetComplete 57.4:

There is no shelter at platform 3 specifically - see photo - but there is a waiting room shared by platforms 2, 3 and 4.

Attached photo(s):
https://westnordost.de/p/216828.jpg