Will they accept a regular push wheelchair that folds?
I'm sure you can take and stow a folding wheelchair on the train and coach, however, you will get quite a workout pushing over uneven surfaces at Blarney. It is a little bit of a walk to get out to the castle and steps to get right up to it. Entry into the castle is mostly a trip up a tight spiral staircase, so a wheelchair will not make it inside. There are gardens surrounding that you can explore. I particularly enjoyed the "poison garden".