It's to keep up with demand
Last week, a tweet showed overcrowding on a train from Galway to Dublin, with many people forced to sit on the ground.
From this weekend, there will be more services on the Cork, Limerick, Tralee and Galway routes to Dublin's Heuston Station.
Irish Rail spokesperson Jane Cregan says it wouldn't be feasible to only allow enough passengers on for the number of seats:
