While there is (or was) a crossover South of Newbridge station whihch would allow Up trains to use the Down platform, there is no provision for that train to continue to Salins on the Down line (i.e there is no bi-directnioal signalling). Dart line form Howth Jcn to Merrion is fully bi-directional, and therefore compeltely different. There was no simple quick fix to this morning's problem. Wrong-road working would have required pilotmen or whatever the equivalent is in CTC-land.
Not saying that Irish Rail are blameless, but just that the wrong-line option was not instantly available.
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