Several comments above relating to money. With the exception of (from memory) some 6 or 7 individuals, Irish railway preservation has never benefitted from the financial largesse of super-wealthy people as it has in Britain; and within the low numbers we HAVE had, the single most generous one I've been aware of in the last 35 years would still not be of the ilk of Alan Pegler, or the Rampton Trust with its seemingly bottomless pit of money.
Time and time again, arguments are put forward here which sometimes come from within the enthusiast community, sometimes outside it, for example, well-meaning people who take the view that various long closed lines would be an absolute boon to tourism if reopened, with an attendant implication of financial self-sustainabilit, or better - as a result.
We need to get this quite straight: (a) any cost of any such thing will be astronomical. Neither private individuals nor local authorities, still less central government, have ever been prepared to put up the money needed for such things, be it a reopened IE line or a preservation operation. (b) As stated before, there isn't the interest.
This is how we differ from Britain, which we can but envy.
In summary, England alone has something like ten times the population of all of Ireland. Ireland has a single standard gauge preserved line, and a total "main line" 5'3" gauge mileage of about 5 miles.
If the English, specifically, had similar levels of interest, there would be perhaps nine or ten lines there, with a total mileage of about 45. As we know, there is very considerably more than that, both in mileage and in terms of actual number of preserved lines. Instead of about 9, England has OVER 200, plus endless museums.
Have a look at the narrow gauge. Excluding WSVR, which to be fair is more of a pleasure ride than an actual preserved railway, we have the C&L & Finntown (which is so impossibly remote that it's hard to see its long term future) which together total about three miles. Look at the Welsh narrow gauge; and Wales has a smaller population than Ireland! I can think offhand of 12 lines there with 130 route miles. There is simply no comparison.
As stated before, we must nurture what we have, and help where we can. Be content with reality!