For Cork, I guess it's a case of extra stations on the existing lines - Carrigtwohill West, Dunkettle, Tivoli, Kilbarry, Monard, Blarney and maybe Ballynoe or Grenagh [these last two would require land around them to get zoned though]. Electrification would be helpful for a better service. Electrify Cork-Mallow and Dublin-Port Laoise and you haven't got that much of a gap in between.
For Galway, it's hard to see much scope except maybe stations in Roscam and Renmore. Those aren't going to do much for most commuters though, so you'd question whether the small numbers who may use it for social visits to the city centre justifies the investment. The rail line is far enough from GMIT and NUIG that buses are likely to be preferable for people going to those. There would also need to be a calculation about whether stopping the train more often would be a disincentive for those living out in Oranmore and Athenry.
Limerick could have a quite nice suburban rail network just by building stations on existing lines and investing in rolling stock that can actually accelerate. They are fortunate that very little of their rail infrastructure was ripped up. Costs would be low, but densities would have to increase hugely to make it operationally viable, as unlike Cork, there are limited existing services that could be asked to make extra stops.
Last edited by comcor : 16-02-2018 at 11:16.