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https://wiki.openstreetmap.org/wiki/Tag:railway%3Dminiature

"Miniature railways are found in parks, public/private gardens and can be tourist attractions in their own right."

"For example Wikipedia at Ridable miniature railway has "between 5 in (127 mm) and 18 in (457 mm), though both larger and smaller gauges are used"

https://wiki.openstreetmap.org/wiki/Tag:railway%3Dnarrow_gauge

"For small railways in parks which are tourist attractions and not part of a railway network railway=miniature is used instead."

Meines Erachtens deutet das alles darauf hin, dass so etwas wie die Liliput- und Donauparkbahn railway=miniature ist: in Parks, Touristenattraktion, Spurweite 381 mm, kein Teil eines Eisenbahnnetzes.