I think my own Society – Weymouth & District – is among many in hosting few or no public running days on its own track.
Our ground-level 5" and 7-1/4" g. track, "table-top" 16mm-scale outdoor circuit and any amount of room for miniature traction-engines, are available to members and bona-fide guests on most Saturdays and Tuesday evenings.
Public running is limited to very rare side-shows to events in the school itself; very few and far between even "BC".
Even our portable railway for external, fund-raising events is used fewer than 10 times a year; but does rely on the goodwill of volunteers to transport and operate it.
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Much of the non-running activities on site is maintenance – including gardening that seeded our internal joke about adding that to the society's name. A few members do both: attending on a Saturday to use either railway, and to engage in permanent-way or horticultural care.
A member who once complained that these days are not "model-engineering", was soon reminded that we don't have a fully-equipped club workshop, so do our model-engineering at home. The club site is for operating the models and testing boilers, but importantly, also the social forum, based around a small club-room with basic kitchen facilities.
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As for the all-important tea-&-biccies, we don't give them away, but invite donations of either comestibles or the heady sum of…. 20p!
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So you are welcome here to use the track as often or little as you wish, and whilst hoping you would also lend a hand with looking after the facilities, you need not fear spending every weekend driving public trains round and round!
(On club days. The secure school grounds and minimum-two attendees rule, are their own restrictions; and the site's management also decrees at least one first-aider among attendees, of any organisation, using the grounds.)