Good point Mark. What are the current limits of the commuter network? On the Northern line, Dundalk would be just about within the 50-mile limit (Drogheda is at MP31).
I would guess Longford on the Sligo line would also be about 50 miles.
What seems to have happened on some routes is the existing routes have been extended without any increase in frequency, resulting in greater overcrowding and longer standing times.
On the other hand, IE aren't causing urban sprawl, just doing their best to cope with the situation that has been allowed to arise.
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