With questions like this I try and think of specific “edge cases” and then have a look to see how they are actually mapped in the OSM data. For subway/underground stations in the UK I’d pick a couple of examples both in the centre of and outside of Newcastle, Glasgow and possibly Liverpool as well as London. My guess is that you might need to have a look at the relations through a particular station, or other tags on it. It’s probably easiest to look directly in the OSM data (see e.g. https://www.openstreetmap.org/node/119274464 for Kings Cross / St Pancras) rather than in something that is postprocessing OSM tags into e.g. “SUBWAY STOPPING LOCATION”.

Whilst the wiki is supposed to be a good guide to “how people map things”, it does suffer sometimes from “telling people how to map” (and sometimes the people doing the telling don’t understand the nuances that the people doing the mapping understand). I certainly wouldn’t use the wiki as a “guide to what’s actually in OSM data”.