Additional disadvantages:
P7 sidings are only large enough for a 3-car 22K or 4-car 29K; the usual 6-car 22Ks won't fit.
Using the Newcomen curve means services can't call at Drumcondra
A very valuable through platform is blocked, causing big issues if a Rosslare service is boarding passengers on P5, or a train breaks down in platform, etc.; as-is you just route DARTs to the available platforms
P5 has a very nasty gap
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