well, another reason for portlaoise was that it is central to the entire heuston inter-city network and so can send out replacement trains to various places more efficiently than out of the core. it was also supposedly handy for the clockface every 2 hour/1 hour service every route was to have with the 22k fleet.
as for toilets/fuel, toilets are emptied all the time in heuston between arrivals and departures. maybe fuel is done there too for all i know.
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