Courtesy of the Donegal Daily website, I became aware of the existence of this website, which shows the location of current and former railways on the island of Ireland. They claim that it is also available on the Irish Rail website, but a check of this led nowhere.
The production is reasonable, but only shows the location of the lines and no further details. For a more detailed set of maps of the current and former railways of Ireland, including stations and a page for each of the latter, my railway maps of Ireland can be consulted. The one aspect where this other site is better than mine is that it also shows city tramways, which I have not included on my site.
As a final thought, the article states that the website was developed with the support of Irish Rail. I thought that the State (which Irish Rail is, as a loss making State owned enterprise) was not permitted to fund projects where private capital (mine) has already funded something similar (see above).