There would appear to be little consistency in Journey times: for example the 1200 Dublin-Cork has 3 stops and takes 2h.50m. The 1100 has 8 stops and is scheduled to take 2h.55m.
Either the 1200 is reidiculously padded or the 1100 timing is hopelessly optimistic. In the Up direction there are other examples of afternoon trains which have had several stops added since the withdrawal of direct Limerick services, but have had very little extra running time added.
The 2h35m constraint is presumably because of potential clashes at Limerick Junction if Down trains get there earlier. Recent reductions in platform capacity at the Junction have made this practically impossible to remediate, unless a Down train is scheduled not to stop there, or unless a separate Down side platform is built (at huge expense).
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