The whole thing seems pretty pointless to me. There is no capacity in Connolly right now and while the signalling project helps the loop-line throughput, increasing the traffic coming from the Maynooth line and crossing the Northern line is hardly going to help the already fragile timetable. Then they would still have to turn back the Kildare trains somewhere or else park them up near GCD.
It doesn't really make any sense unless they can somehow magic up a couple of extra platforms at Connolly or bugger up the Maynooth service by running more trains to Docklands.
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