By the way, one useful site is gmap-pedometer.com. People who like jogging find it very useful. It uses Google Maps, which unfortunately doesn't use the Navteq data, but has good maps of Dublin City. As an example, here is the Heuston-Connolly path of the Luas.
http://www.gmap-pedometer.com/?r=704196
To prove that I am indeed a map freak, I'm attaching an example (PDF) of what could be done (using Yahoo Maps) to show a detailed map of the Irish rail network (or any network for that matter). I didn't finish it cos I actually do get around to having a life every now and then
Make sure you view it at 100% scale.
I never realised how crooked the Sligo line approaching Dublin was until I did this!