If IE was to close for 7-10 days the Christmas Day-New Years Day period is when it should be happening. Wasn't that how it was done when they dealt with Dun Laoghaire's slab track?
Of course, if
this had been built (with a crossover) maybe it wouldn't be quite such a big deal to do it, though train storage might have meant some truncations to Mallow and early morning deadheads.