For the record, both of the afternoon services left Wicklow c. 25 minutes late as they had to await buses arriving from points south. As both of these trains go forward to Maynooth, I would imagine that passengers heading from City Centre stations towards Maynooth on either of these services were seriously delayed.
My informant at Wicklow suggested that the engineering works were related the closure and associated diversionary road works at an unmanned crossing near Rathdrum but he was not sure of the details. It certainly seems unusual even by IE's standards, that a large portion of an intercity route has been closed, apparently without notice or, it seems, explanation.
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