Maybe a shuttle from Bray/Greystones to Dalkey would be doable as there are crossovers at Dalkey. But going to Glenageary would involve some very awkward single-line and wrong-linne running (and maybe electrical issues as well given that power would be off between Dunlaoire and Sandycove?).
Also, would there be a problem having rolling stock away from Fairview depot for such a period?
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