Try to make sense of the barcode here
https://www.irishrail.ie/home/
If you have a recent camera/smart phone it should be able to tell you what it means, if it can't install an application to read QR codes and try again. If it decodes it will tell you what you have to do, and its worth it!!
Obviously we ain't going to allow you to cheat
And it does work, its was a little confused earlier