The fastest time for Connolly Bray is listed as 25 minutes under the 4am in the morning scenerio
Under real conditions you are looking at 30 minutes.
Bi directional signalling isn't worth the trouble since the Dun Laoghaire Dalkey section is very slow so the fast train hasn't got much chance to overtake, also there are trains going the other way.
Three tracks from Killiney into Bray would be fairly feasible allowing two trains to arrive/depart Bray at the same time.
The problem with the route is all the time savings which are feasible are all south of Arklow so the benefit is not there for most passengers
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