It cannot be helped, trains get turned on certain routes Waterford/Limerick/WRC etc while units change regularly at Heuston/Connolly etc while the joiners can be very sensitive and dont join up (or not allowed to be joined until repaired at times).
You cannot change this however I don't think bike/wheelchair thing is a major issue, the end coach with a full line of windows and a small gap between them and doors is the bike and the end coach with no windoe some distance from the doors is the wheelchair coach.
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