I would imagine that you would save as much in addressing waste and inefficiecies on DART as in closing the WRC. You would have to imagine that Irish Rail have done a sweetheart deal on the price of electricity given the amount of empty space being dragged around - eight car trains are rarely required outside the morning and evening peak periods on monday to friday yet are to be found at other times rattling around with barely a hand full of passengers for most of the trip. Revenue protection on DART is none too hot either with some of the busiest stations in the country unmanned most of the time.
Unmanned stations and large lightly loaded trains increase the incidence of antisocial behaviour and vandalism which deters other passengers as well as generating expenditure on repairs.
Another inefficiency that has defied resolution for years is crew changing at Fairview which slows journeys and disrupts other services. What is the cost this represents in lost capacity ?