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Currently it seems Dublin Heuston and Dublin Connolly stations are only linked via tram, which from the following two maps seems to divide the Irish Rail network into two.

Assuming such proposals were/are not already considered in OTL, what if Dublin earlier on received its own analogue of the Picc-Vic Tunnel (linking Manchester Piccadilly to Manchester Victoria) or Crossrail Glasgow (linking Glasgow Central to Glasgow Queen Street)? https://en.wikipedia.org/wiki/Crossrail_Glasgow

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