Try offering them to Mayo Books in Castlebar: https://www.mayobooks.ie/
Or Charlie Byrne's Bookshop in Galway: https://charliebyrne.ie/
Someone who's not on this web board will run across them and benefit from them. I frequently buy certain "common" Irish railway books and magazines from independent book sellers in Mayo, Galway, Clare, Limerick. I'm near Chicago in the States, so "common" in Ireland is non-existent here.
Another idea: the Cavan & Leitrim Railway preservation group in Dromod. Darragh Connolly is deeply involved.