As for the WRC, the case for completion may not be overwhelming but despite motorways Galway is a heavily congested city and both it and it's hinterland would benefit from improved regional rail links. The other key advantage of re-instating the Athenry to Galway line is that it would allow diversion of freight traffic destined for Waterford away from the Kildare bottleneck.
This is such a myth.
Yes divert via West of Ireland, and require 2 loco changes (?) and take just as long as current paths do. Not to mention the cost of manning Limerick J-Waterford to service the route combined with little spare capacity between Ennis-Limerick.
The current schedules were designed to cut costs and don't have much impact. It would be cheaper to return to the evening runs at a 23.30-00.00 arrival and avoid any congestion at Kildare.