The scope for high speeds south of Greystones are very limited as the line is full of curves, south of Arklow and more so south of Gorey the line straightens out and you have the long section Enniscorthy Wexford
Level crossing wise if you hit at the perfect moment its possible to accelerate to 60mph once past BN21 at Sandymount, provided you don't get caught by the level crossing procedures which is impacted by trains going the other way
In olden times there was no safety interlock with the gates so you could hurl the train towards them with zero margin for error
All that said best time today is 20-25 minutes better than the baseline year of 1973
I've routinely done Dun Laoghaire Pearse in 10 minutes flat for a little over 6 miles
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