Thank you ever so much for your reply. I'm extremely grateful that you've taken the time to do so.
Firstly, thank you for that link to Ernie's Flickr page. What an absolutely amazing resource! A very quick look has confirmed that I am going to lose many hours of my life down that rabbit hole! It looks like there are some absolutely fantastic albums in there. Exactly the kind of thing I was after. Thank you!
I'll definitely join the IRRS. As you say, at €50 a year, it looks like it provides a wealth of resources. The journal will be nice to receive too.
I'm sorry for being so vague in my original post, I realise it hasn't really helped. In terms of interest, it's in the south. I'm trying to soak up as much inspiration as possible, but the lines radiating from Limerick are favourites. My family origins are in Kerry, Clare, and Cork, so I feel a pull to that area. I've always been fascinated with the western railway corridor too. And the Kilkenny line is another I like.
Thanks again for being so helpful. I really appreciate it.
David
PS - I better not start looking at Ernie's Flickr page now, otherwise I won't make it into work today!!