I think we need to have ticket inspectors walk through the train, and if people are sitting in reserved seats, check they are the reservation holders. If a seat is reserved later on the journey, the passenger should be informed, "you'll have to vacate these seats at Thurles". And if an elderly person has taken a reserved seat, the ticket inspector should find them an unreserved seat elsewhere, asking a more able bodied person to vacate one of the "priority seats" if necessary.
Of course, if a person can't find their reserved seats, the onus is also on them to ask a member of staff to find it.
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