Buried deep within NTA Business case
http://nationaltransport.ie/wp-content/uploads/2015/09/DART_Expansion_Programme_Revised_Business_Case_201 5.pdffor the DART Underground (or not) is a proposed service level for Kildare-GCD services in the Do Minimum Section page 121-123
In Summary for the Morning peak:
To GCD
Peak: 2 trains per hour, all stops Kildare-GCD
Peak : 1 train from Newbridge and 1 from Portlaoise to GCD
The 8-9am period would have 4 services
To Heuston Commuter
Portlaoise- Heuston - Hourly as at present
Newbrige/Kildare - Heuston - one service each
To Heuston - Intercity serving commuter stops
1 Galway- Heuston (2 trains each service different stations)
1 Waterford - Heuston
0 Limerick
1 Westport
1 Carlow and 1 Athlone as at present.
Rolling stock:
The proposal shows most of the GCD traffic as 8xDMU (I presume would be 2x29000) and the Heuston traffic as 3XICR or 6xICR. There is an oddity with one Waterford-Hueston also being 8xDMU. Question here is where are they going to get all the 8xDMU's? Maybe this depends on electrifying the Maynooth line first?
Overall a big switch from IC to Commuter and GCD taking most of the traffic.