The IE screen shows a pointy "engine" (DVT?) on the left, and next to it is coach "A" whihc is the 1st class. On MK 4s these 2 vehicles are at the Dublin end. So it's Dublin to the left and everywhere else to the right.
However on Mk 3s the 1st class is (or was) at the Cork end, and I don't know how the reservation displayed this, or if they ever used a diagram for the MK 3s.
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