Conyngham Rd is the problem
I would be confident the Chapelizod bypass bridges would be high enough, but there is plenty of space either side to drop the track if needed
So where did 2 billion go in Dublin rail
New fleet 600-800
New depot 50
New train control centre 50
KRP2 (4 tracks Inchicore onwards) 150?
Level cross elimination?
The real problem here is short term planning means long term cost. The new plans require electrification of Heuston station (which will be painful and the Phoenix park route and possibly 4 tracks down the gullet section which has been advised against. The original plan required no works inwards from Inchicore