Consistently people sitting in them and not worth the hassle of trying to chase?
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If it's a recurring problem, why not suggest to Irish Rail to reserve one carriage for pre-booked seats. That would be much easier to police.
I remember finding a little old granny in my seat with her flask of tea and sangers spread out in front of her. .
If there were plenty of other seats that is fine.
But otherwise you should have asked her to move. Not to do so, would be age discrimination.
I guess I might have done the same for anyone who needed a bit of extra flexibility, like a parent with a few kids or whatever.
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The elderly are probably traveling free anyway, so they should definitely not be taking a pre-booked seat.
Brendan
As a pensioner with a travel pass, I was always afraid of turning up and refused travel. how do I pre book?