It appears IE have taken on board the concerns of residents in Railway Estate in Inchicore. Both tunnels will be bored east to west from CIE lands at East Wall, rather than one in each direction.
This rubbishes one of the main reasons they extended the original plan to tunnell from Heuston station and extended this to Inchicore Works, as Heuston was said to be too challanging as a portal location.
So why not save a billion or so and remove nearly 3km of tunnel and go as far as heuston as originally planned?
Maybe they could get it done for 2016 if they did that too.
"On 13 May 2010, a spokesman for Irish Rail said the original timeframe of 2015 had been set in 2007 when the line was due to terminate at Heuston Station. The subsequent decision to extend it to Inchicore meant there would be 40 per cent more tunnelling than had been proposed. This means that the new timeframe is to complete the project by end of 2018" - http://www.rte.ie/news/2010/0505/dart.html
Obviously there is the difficult (but no as difficult as tunnelling) problem of the quad-tracking:
"- The extension removes the requirement to increase the number of tracks between Inchicore and Heuston to meet the underground line, which would have required significant property acquisitions and would cause serious disruption to residents, as well as road and rail users. "
This is over-stated as Irish Rail wanted to do this from day one and changed their minds when they saw the limitless budget.
Surely it would cost less? 40% less tunnell and a couple less years work would save billions.
"- The extension of the tunnel to Inchicore would dramatically reduce the impact of the tunnel’s development on existing rail services during the construction phase, by avoiding the crucial Heuston area "
There is also the conflict of interest in Irish Rail adding on a Framework Development Plan to their lands in Inchicore Works, surely this creates a bias and is part of the reasoning to tunnell this far and even though the benefits of the capital appreciation of the land are FAR FAR less than the costs, Irish Rail see this cost as free since its not them funding it, it's an extraordinary waste of money to add 40% more tunnell for no good reason.