Laurie, will you be going straight from the airport in Dublin to Cork? I would definitely recommend taking a train, as it is actually quite a good rail system.
The "30 stations" you are referring to are actually all DART (Dublin Area Rail Transit, I think) stations - like the subway. You want an inter-city rail station, and there are three. Heuston should get you to Cork quite easily.
Here is a link to the inter-city map on the Irish Rail website. I hope it helps!
http://www.irishrail.ie/your_journey/intercity_map.asp
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