The add on concept does exist as ive paid it on many ocassions. For example, I boarded a train to Westport in Kildare with a return ticket. On the return, I decided to travel all the way to Heuston. I paid an add on. If the ticket guy in Portlaoise gives you grief, just buy the basic return from there to Limerick. On the return leg, pay the checker the add on.
It can be done.
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