If they did the job in phases the sum of the 2 or more phases might exceed the time taken to do it all at once. Also, while the phase nearest Dublin (Athlone-Claremorris?) was being done, you would have train Westport-Claremorris, then change to Bus as far as Athlone and then back on the train for Athlone-Dublin. Would that be any better? I don't think so.
On the other hand while the Claremorris-Ballina-Westport bit was being sone, there would be a gain. But taken overall, I don't think the strategy is too bad.
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