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DART underground - options
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I had a look at the map again and added the Luas lines and made a few other corrections as suggested above (the software makes it very easy).
I removed ML upgrade of south of Charlemont. The idea is to add the DART tunnel to what is currently planned or started. Thus the map adds the tunnel assuming DART+, Metrolink and the Luas extension to Charlestown are completed.
Like I said, if anyone wants to fiddle with it, feel free: https://tennessine.co.uk/metro/be1b14adae85c1b
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The last published route in the 2019 study still included the High Street/Christchurch stop. Also, I think this is actually the only station that would not have to be mined out. There’s about 8000 square metres of road between Cornmarket and Christchurch Place that could be dug out to create the station box. The area is about 20 metres at its narrowest, but the large plazas either side allow for good sized entrance halls to be constructed:
I accept that this would be enormously disruptive to city traffic, but it’s still a lot cheaper than mining.
(For those unfamiliar with this area, the Dublin City Council offices are at the top right of this image, the Four Courts are directly north of here, across the river).
This area is also where I’d personally like to see a second Metro, which would run north/south through the core of the old city here. I'd hope that when DU is revived, it is done so in parallel with plans for a second metro line, so simple city-centre interchanges can be put in place between them.
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I think Pearse is still preferable because it has the above-ground space that would be needed to accommodate a DART-to-DART transfer station - and the location is more central too. I really don’t think there’s any way you’d get permission to dig St Stephen’s Green, especially as the proposed station box is at the northern side of the Green in all of the designs - this is also the only location that allows for an easy interchange with Metro.
At Heuston, though, I feel the DART station really needs to be at the front of the station, not the back, because all of the connecting modes (including mainline rail) are accessed from the front of the station. One proposal was to dig the station under the grounds of Dr Steeven’s Hospital, and the Guinness site, something like this:
I know that this exact location becomes almost impossible if you launch the tunnel from within Heuston itself, but in that case, a hybrid dig-down-then-mine-across build is still possible, starting at the northwest corner of the Guinness site, and working eastward, like this:
This would still be cheaper than a completely mined station, and may actually be not much more expensive than a true cut-and-cover here, given the need to preserve the roads and the Luas tracks above.4 -
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