I would imagine that there will be some through services from the southern line to Pearse or Grand Canal Dock - perhaps two trains an hour each way. The elimination of a mode change at Heuston should prove attractive as should direct services to Drumcondra.
While the proposal is modest it does take advantage of underused assets (KRP, Phoenix Park, post city centre re-signalling through Connolly, Tara Street and Pearse) and could be expanded by running some services off the southern line into the Docklands.
As it is a near zero cost proposal, it is well worth implementing and should generate a few thousand extra trips per day.
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