Always like these threads. I've been to Foynes, Castlemungret (and Killmastulla siding if that counts), Youghal, Mullingar - Athlone (last time behind No. 4 doing a storming running around 70mph), Athenry -Tuam and of course Waterford to Rosslare Strand. I did ride the now doomed Tralee Blennerville steam railway.
I've also been to Navan by train.
I probably could have gone to Ballinacourty by train, if I was aware of the existence of the IRRS as I probably would have been allowed to go on the farewell train. I should have gone to Kingscourt, New Ross and Tuam - Claremorris.
In my imagination, I've travelled many closed lines, but it would be nice to borrow the Tardis to do a few in reality!
My biggest regret, is that I never did the North Kerry from Ballingranne to Tralee, I remember trains shunting in Rathkeale but was only 6 by the time it closed, and I was still too young to do the weed spray, though I did walk a good bit of it when the rails were still intact.