I went to school with children from three families who lived in about six carriages between them all that were parked in an old disused siding near the local railway station. They were hooked up to the electricity grid but not the water mains or sewage, so every child had a daily chore involving carting buckets of water from the pump that once filled steam locomotive boilers nearby, as well as "lining" the communal dry toilet with ash and occasional gravel (a facility they shared with occasional spectators at the local rugby club's matches, who I suspect had paid for its construction). One can only imagine the sheer labour involved on the part of the three mothers ...
The rest of us were dead jealous.
PS: Just checked the site on Google street maps - where the siding once was is now a de-luxe housing estate of about 30 semi-detached houses which, given the address, I assume retail for nothing less than a million euros each.
PPS: The carriages, as I recall, were stock that had once been used on the Belfast to Dublin route run by GNR. They would have left service, I assume, in the 1930s after probably 40 to 50 years' service.