For what it's worth, any filing, sorting, scanning, putting things online the IRRS does is done by someone on a voluntary basis, the state pays someone to do the same function in the NLI.
In an ideal world, a branch of the National Museum would cover industrial heritage and railways. But since there is little interest there in such things it's up to regional museums that may actually take an interest (Limerick and Waterford city museums have an online presence with heaps of rail images) and the IRRS.