Irish Rail are peddling a nonsense in proposing a DART spur from Clongriffin to the Airport. The Belfast line in it's present form is hopelessly congested and would not be able to host an Airport service of sufficient quality to attract business.
Given the mess made of other services in order to run a ten minute DART one can only imagine the effect of an Airport DART service.
Ross and Co are right, although probably not for the right reason. Anyhow as has been said so many times before serving the airport is only a small element of Metro North. Given the LUAS experience I am not sure that smaller trains and shorter platforms is a very intelligent way to progress Metro North.