[Articles] DART Underground

[Peter1966]

I had read the info on http://www.railusers.ie/campaigns/extendthedart/
It's all good stuff and a compelling case is made for the underground interconnector - which I am strongly in favour of.

I am worried about Ruadhan Mac Eoin's idea of using the Pheonix Park Tunnel instead of buliding the underground interconnector. It's strikes me that his scheme would be inadequate due to:

1. Lack of capacity
2. Slow train speeds
3. Lack of integration
4. No service to the Dublin 2 area.
5. Still a two track from Inchicore to Heuston

Can anybody provide some facts and figures to flesh it out ?

i.e. Under Mac Eoin's scheme:
What would the additional journey time be to get from Parkwest to Spencer Dock ?
How many less passengers and trains per hour could the line from Parkwest to Spencer Dock accomodate ? I noted that Mark says 2,000 vs. 30,000 - is that the PPT route (2,000) vs. the Underground Interconncetor (30,000) ?