KowaiBaz: As of 06:14 yesterday morning, November 21st 2016, this is happily no longer a ghost line and the cache title and description no longer make sense. There are now 15 new peak time train services passing through the upgraded tunnel route and it is likely that these services will be expanded to include off-peak and weekends.
One of the items in the summary of Public Consultations addressed the possibility of stopping at Heuston: Iarnród Éireann states that "Current infrastructure does not permit services to call at platform 10." Remember GC2Y3VQ?
Thanks to everyone for the logs on this one. It has had 38 finds in its 3 years 7 months of life.