Any train Dublin-Waterford should be able to take 3 bikes + any number of folding bikes (as luggage, they are expected to be covered).
Where the train is made up of a two 3x22000 sets, it should be able to take six. However, some sets have been found to be without racks, so they are only able to take one (in the cupboard - you'll need a staff member to open it, make sure you have enough time when getting off).
Waterford-Limerick Junction trains can carry some bikes, I'm not sure how many.
There are no reservations for bikes yet, but it is expected.
Fares: http://www.irishrail.ie/your_journey/bicycle_information.asp
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