weehamster wrote:- Connolly is unsuitable for underground tunnelling.
This is most probably a myth.
It didn't seem to be unsuitable back in the 1970s when a route was proposed from the Northern line to the Kildare line via Connolly Station, College Green/Dame Street and Heuston Station. I'd have to say that I wouldn't fancy tunnelling under the station since they built an office block on top of it, but it would most certainly not be one of the engineering feats of the new millenium to build a station under Amiens Street - with easy access to the current DART, intercity trains and the LUAS.
- Spencer Dock already has a line from the northern line which leads into it
- The northern line is an elevated track (from just before Killester Station and after Grand Canal Dock station) and you need to get around 15m below ground level for the tunnel. To get under Connelly, the tunnel needs to start near Killester station.
It is my understanding that the gradients required to bring the Northern line below ground between the Tolka and the Royal Canal are less steep than will be required to bring this line down to a sufficient depth to pass under the river at Spencer Dock. So it certainly should not be necessary to start anywhere near as far north as Killester.
Sorry mate, Integration -Luas (Green) (possibly Lucan), Metro tram, DART, and the fact its a popular shopping area as well as many people work around there too.
The integration possibilities are not superior at St. Stephen's Green compared to other city centre locations. Take College Green/Dame Street, for example, which (as mentioned above) was a suggested location for a station back in the 1970s. Obviously an East-West tunnel through here would integrate with the LUAS when it is linked, as is the plan. Also with the metro - remember that the metro documentation pointed out that a big reason for its station at St. Stephen's Green would be that it would allow a connection with the interconnector. Obviously, if there was a different route for the interconnector, there'd be different station locations on the metro. (Indeed, there was supposed to be a Trinity stop on the metro, but this got dumped in favour of the current plan - probably a world first - to build two large stations in just one location).
And, of course you've also got better integration with the city's buses at a more central location.
What, along the same route more buses carry more passengers that the Luas? Or are you referring to the whole city network compared to one narrow line.
You said it. I couldn't have put it better myself.
Integration possibilities with transport from all over the city, rather than just transport along one narrow corridor.
Clearly there are alternative routes to the current plan for the interconnector. The 1970s route for example. Or a Spencer Dock-Pearse Station-College Green/Dame Street-Christchurch-Heuston route. Or probably several others.
College Green/Dame Street seems to me, however, like the ideal location for the interchange. Dig it up, put in your stations, cover it over, replace a few statues and a fountain, and then pedestrianise the lot (as is part of the city's long term plan). No need, therefore, to destroy one of our most beautiful parks for decades to come.
It is simply not credible that only one possibility exists. However, only one route was presented to the public, which, in my view, is a scandal.