I'm not sure how its done in other countries, but one wonders if there is the possibility of a "superstop" in suburban areas where both intercity and suburban services would stop.
Ideally they would interchange with other services (bus, Luas) and be destinations int heir own right - that is a meaningful population and employment density. Dun Laoghaire and Bray are the best current examples, but Drogheda, Malahide, Maynooth, Clonsilla, and Clondalkin-Fonthill are or will be other models. The cluster of Sallins-Newbridge-Kildare is a bad model as various intercity services stop at each of them in an inconsistant manner
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