IE actually are planning to go double decker, they don't want to but they aren't rulling it out, if you look at the northern line even at 4 trains an hour its not even close to dealing with demand, 6 trains is unlikely to cope either, so you either go longer to 12 or go double decker or go both, well 4 tracking to Howth Junction ain't looking likely
The problem is the density is now appearing in out lying areas too far away to be serviced by tram or metro
You won't see private operators on the Dublin suburban on single lines it wouldn't make any sense, if the whole electrified section was up for grabs you then would have something still unlike the UK you will never be able to show up and start a service as you need trains and facilites
Out of the huge number of private operators in the UK only 2 to my knowledge are running under open access rules (Heathrow Express and Hull Trains)
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