Hi Meg,
What a wonderful idea! That's a great way to get a feel for your ancestors..travel in their shoes, or in this case, their train tracks!
I found a few links that might interest you: http://www.irishabroad.com/news/irishpost/travel/tralee.asp
http://en.wikipedia.org/wiki/History_of_rail_transport_in_Ireland This has lots of information about all of the train lines in the country and their history.
http://www.trainweb.org/irishrails/ information about the old train lies, and where to find maps, etc.
http://corkheritage.ie/?page_id=388 more information about Cork's train heritage
http://www.modelvillage.ie/ someplace to see if you do come to Ireland!
http://www.invectis.co.uk/cork/cbscr.htm
I hope that will get you started in your research!
Please make sure you link anyone else in your family who is interested in their Irish heritage to our site - and indeed anyone else you know of Irish heritage.
Kind regards,
Sinead Cooney
Genealogist (Ireland XO)