After mapping a model railway club a few days ago, I looked around in vain for a page for them, but found nothing, except for a discussion from Germany that agreed that club=model_railway would be the best option:
Nice! Thereās one Iām aware of thatās currently just a tourism=attraction, so giving it a more specific tag will be satisfying
Just to confirm, would you say this tag is applicable when the trains are large enough to sit on? Or only the smaller kind that can be held in oneās hand?
club is fine for clubs (traditionally common in some regions), but it is not a generic tag for miniature railways installations. There are also commercial model railways that are not organized as clubs, but are open to the public (for a fee or for free), either as a standalone attraction, e.g. https://www.miniatur-wunderland.com/
or inside a museum e.g. a small one here https://www.boxenstop-tuebingen.de/
I propose to add the length of rails as a property (the latter has 104m of rail, the former, worldās largest according to their site, has 15400m of tracks.
I think leisure=miniature_railwaymodel_railway could eventually be a good fit for these although use is still a bit limited leisure=miniature_railway | Tags | OpenStreetMap Taginfo
There are also vending machines that sell the service of running a model train for a minute or so, inside a glass box:
correct, this should have been leisure=model_railway, I updated the paragraph.
IMHO the tag tourism=attraction is not a semantic tag that describes the nature of the thing, more a kind of a placeholder for the feature tag (or to be used additionally) and somehow stating āthis is importantā