The refund form for the Sligo line is available here.
http://www.irishrail.ie/images/pdfs/...unt%20Form.pdf
This link and more info is available on
http://railusers.ie/passenger_info/refunds.php
I've handed out forms to everyone in the office that uses that line - one guy was over three hours getting to Maynooth after being told by Irish Rail staff who boarded a bus that the trains would be back running in a minute.
Using the refund system as a form of protest is about the most effective way of doing anything and it is a reasonable use of your time given that you get a few quids' worth of vouchers.