Bit of digging gets the page listing the services
http://www.irishrail.ie/news_centre/...ew&news_id=402
It's noted that the services listed there are only valid for special fares until 28th November. It looks like they have removed the 1915 train from the special offer? I don't think the fact that the Cork train is still 10 euro has any bearing on this. (don't see why either)