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Why can't we classify the Green Line south as a Metro now?

13

Comments

  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 24,360 Mod ✭✭✭✭bk


    So I did some more crayoning and here is what my idea of a Red Line Luas tunnel overlaid on the Luas 2050 Vision looks like (forgive the bad drawing!):

    Note the 2.5km to 3km red line tunnel in the middle which is the main change, from Fatima Stop to around the city center:

    Screenshot 2026-06-06 at 15.15.45.png

    So now you have Tallaght, City West, Clondalkin, Kimmage and Lucan lines all feeding into the tunnel.

    That takes the pressure off the old city center red line to handle Blanchardstown, Clongriffin and Poolbeg.

    Though perhaps you could extend the red line tunnel further East to handle Poolbeg too.

    This line would look a lot like the Porto Metro, with 4 "lines" extending out and branching from the tunnel on one end and another on the other end.

    Untitled Image


  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 24,360 Mod ✭✭✭✭bk


    BTW I had another thought on how you could add extra capacity to the Green line.

    TII has a plan to add extra trains to the green line with a two minute frequency and extra turn backs at both Charlemont Luas stop and Stephens Green.

    So do that, but take it a step further, increase the length of all the platforms from Charelmont to Brides Glen to 90m. Then run a mix of both 90m and 55m trams. The 90m ones turn back at Charelmont, while the 55m continue you on to Finglas.

    You could even possibly have the 90m ones go as far as Stephens Green as both it and Harcourt Street look like they could fit 90m trams, it is just the curve and junctions between Charlemon and Stephens Greeen that I wouldn't be so sure of. But it would be a possibility.

    Interestingly you could replace the current 55m trams with 45m trams that could be coupled into 90m long two tram units, like they do in Porto. I know they have less capacity then straight 90m trams, but it would solve Kris complaint of mixed fleet of different length of trams. 90m long two 45m coupled unit go as far as Charlemont or Stephens Green, while 45m units continue North.

    Just another idea, a plan C perhaps.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 24,360 Mod ✭✭✭✭bk


    Taking this idea a step further, if you could run 90m trams as far as Stephen’s Green, then run all trams from Brides Glen to Stephen’s Green as 90m trams, terminating at Stephen’s Green and then also run the 55m (or 40/45m if you prefer) trams from Stephen’s Green to Finglas.

    So you basically split the Green line in two at Stephen’s Green and it becomes a transfer site. The advantage of this is that you maximise the capacity of the Southern Green line. At a 2 minute frequency 90m trams would approach 20,000 PPHPD.

    If you can’t run 90m trams to Stephen’s Green, then make this sort of interchange at Charlemont or Ranelagh instead. 90m trams Brides Glen to Charlemont, 55m trams from Charlemont to Finglas.



  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    I've been saying for years on here that we should extend the Red Line from Fatima underground to make it a proper pre-metro. The running characteristics west of Fatima are very favourable towards high capacity, very long trams running very frequently. The city centre hobbles the Red Line especially but the Green Line too, to some extent.

    I still think the natural partner for metrolink is the green line as far as Sandyford. Build the N11 Luas to Sandyford and let it take over the existing Luas south of there. Ideally take that N11 Luas underground at Donnybrook garage and drive the tunnel over to Broadstone and link the Finglas and N11 Luas lines. They are a better natural match for each other and lend themselves well to pre-metro too. Then upgrade the Green line to metrolink. Some day in the distant future, extend metrolink north to R&L or Donabate and south to Woodbrook to provide amazing interchange with DART and outer suburban services.

    We need to get one tunnel started so people realise it's not some mad idea that only foreigners do. Once people are used to tunnels being built for railways, delivering much improved quality of life, the snide newspaper articles will stop appearing.



  • Registered Users, Registered Users 2 Posts: 1,885 ✭✭✭spillit67


    I’d like to see Rialto and Charlemont become hubs for Luas with better quality onwards connections offered there alright. Good launch pad for incremental extensions out SW and SE respectively, although the N11 Luas mooted routes seem to not use Charlemont atm.

    Woodbrook is not happening and nor should it. Bray is the location needed.



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  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    I think it's already fairly ambitious going to Woodbrook, but could be done on the surface using the original alignment and not too much demolition. I don't see how you thread it to Bray (assuming you mean Bray Daly) on the surface so it would have to be underground or on some very long viaduct. Not sure if that's realistic when the very same level of DART-Metro interchange could be provided at Woodbrook. You'd be building an underground metro just for the people living around Bray Daly station because most of Bray would still not be within walking distance of a metro station co-located there. If you are taking a bus from Oldcourt or Ballywaltrim or somewhere like that you can just route that bus to Woodbrook to provide better interchange and probably avoid town centre traffic while you are at it. Personally I don't think Bray warrants underground metro to save people taking a metro frequency DART to Woodbrook and changing there. But I'm not gonna labour this point. If we ever are in the position where we are deciding Woodbrook or Bray for ML I won't really care, because either would be brilliant.



  • Registered Users, Registered Users 2 Posts: 1,097 ✭✭✭JPup


    bk - I like your plan but if you are adding an orbital west line (very important in my opinion as that is where the city if growing most and the M50 is over capacity) you surely have to connect it around to Metrolink at the airport?!

    Ideally your post-2040 link from Charlemont to Tallaght would then seamlessly connect to the new orbital west, creating a loop around the city. People could then travel from huge swathes of the city to the airport in less than 45 minutes as well as many other major trip generators.

    In my opinion, as soon as the Metrolink project is finished, it is vital that the next phase (probably the Metro west line in terms of importance) enters construction immediately so that all the knowledge accumulated by the staff who have been working on the Metrolink project is not lost. Then phase 3 should follow immediately after that and so on until the city has a fully developed public transport system!



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 24,360 Mod ✭✭✭✭bk


    The image I posted above is from TII’s Luas 2050 Vision. I only added the red line tunnel to show where it might go. The rest is TII’s plans.

    I’d agree that the Orbital West should ideally go all the way to meet the Metrolink line. The Finglas Luas should also extend across the M50 to meet it and perhaps could even extend to Ashbourne.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 24,360 Mod ✭✭✭✭bk


    On Bray, the plan for DART+ South is 5 minute service to Bray, I’d call that a Metro or at least a Metro like service.

    There is an argument to be made, that by instead keeping it as Luas to Bray, rather then Metrolink to Woodlawn, it makes it easier for street running Luas to penetrate into Bray without a tunnel, which might give a better type of service. It is sort of what these sort of LRT’s are good at. But it is certainly an interesting idea.

    Your N11 to Broadstone idea is also very interesting, but I’m not sure where you could fit the tunnel entrance around the N11, no site particularly jumps out.

    Broadstone to somewhere south doesn’t make for an intriguing possibility. I’m not saying anything soon, but I can see it being used as a tunnel entrance sometimes in the distant future.



  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    RTE appears to have a rather large lawn in front of it. If that's not enough I'm sure the RTE radio centre could be relocated and a portal created there.



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  • Registered Users, Registered Users 2 Posts: 453 ✭✭legend99


    Why wasn't the green cross city line put in a tunnel? It seems to have been an extremely short sighted decision?



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 24,360 Mod ✭✭✭✭bk


    Didn’t they sell that land or at least some of it for housing development? I haven’t kept up with their various developments on that land

    At the time, they just weren’t really thinking we could afford a tunnel.

    I one stage they were thinking of building it as a guided busway, so Luas was a big step up from that!

    Hopefully upgrading to to Metro should resolve this mistake.



  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    Imagine the possibilities of an east-west and north south Luas tunnel. They could be connected and you could have all sorts of interesting routes.



  • Registered Users, Registered Users 2 Posts: 264 ✭✭ArcadiaJunction


    I was thinking something like this too when I asked the original question. That the green become the terminus for Green Lines north and south. Add more tracks and an attractive glass roof and you have Dublin's Central metro/tram station.



  • Registered Users, Registered Users 2 Posts: 453 ✭✭legend99


    But the green line was built with the intention of being converted to metro right? It just seemed crazy to not tunnel given that?

    And a hopefully related question which is okay to ask here? Given how important Dublin was in the British Empire 125 years ago, did the British ever look into an underground for Dublin?



  • Registered Users, Registered Users 2 Posts: 14,299 ✭✭✭✭Zebra3


    Dublin was of very little importance to the British.



  • Registered Users, Registered Users 2 Posts: 661 ✭✭✭noelfirl


    There was probably a greater chance of Belfast getting an underground by the time they were in vogue than there was of Dublin getting one - Dublin's time in the context of the Empire had been and gone.



  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    Though it must be said that the last time a railway tunnel was built in Ireland it was actually under British rule, was it not? I'm not for a moment suggesting we'd have better infrastructure if we'd remained in the Union. I don't believe that for a second, especially when it comes to roads and we only have to look across the border to see how little rail is left up there. Even more was destroyed by the UTA than CIE.

    Anyway, looking forward we should really look at tunneling under the city centre for the primary radials. There is no good way to deliver metro like services to the suburbs with significant on-street running through the medieval city centre street layout, no matter how much priority is given to trams. It's also not a great quality of life for anyone in the city centre to have a constant stream of long trams passing through.



  • Registered Users, Registered Users 2 Posts: 1,885 ✭✭✭spillit67


    There’s only a tiny bit of complicated land in Bray. The old golf club lands are earmarked for it to go through them and over a new bridge to the station.

    Why is terrible density at Woodbrook a higher priority? Yes there’s new housing but it still is largely a golf course, a graveyard and a massive public park.

    Bray Daly is in the middle of a large urban area, connecting the main street and the Prom. It has significantly more density in and around it. It has all the local bus routes feeding it along with DART and Commuter.

    Also Woodbrook isn’t even convenient from a motorway perspective.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 24,360 Mod ✭✭✭✭bk


    On the British question, worth keeping in mind that all the railway lines and tunnels were built by private companies during that period of UK rule, not the British government, much as it was in Britain too. So it is possible, even probable that their construction would have happened anyway if Ireland was an independent country during the period, depending on the level wealth.

    Ireland gaining independence in the 20’s had little impact on any new lines being built. By then you had WW1, the Great Depression and leading into the WW2 period. Britain was broke too and little rail development happened for them on outside of London.

    Perhaps an interesting question would be what might have happened had Ireland been an independent country during the famine. Likely it would have been handled much better, with relatively little loss of life and force migration. That would have meant Irelands population would have been much higher in the late 1800’s and possibly much wealthier. But that would be well into “what if” territory.

    Sort of, the Green line was built with the intention of a type of Metro that was different to what we are now getting for Metrolink. It was designed to take wider 2.6m vehicles and substations were built larger for extra equipment.

    However at the time they were assuming we would use the same sort of low floor trams that Luas uses, just longer and wider and that it would use the same sort of power systems and signalling, which would of allowed at grade pedestrian crossings. To be honest more of a semi-metro rather than a real Metro.

    What we are getting now is a real a metro, high floor vehicles, fully automated, with a completely different power and signalling system, platform screen doors and people fully segregated from the line.

    While upgrading the Green line to that sort of Metro isn’t impossible, it is much more complex then the simple upgrade it might have been with the older Metro North plan.

    What murphaph is getting at, by routing it to Woodbrook, the entire line can be upgraded to full Metrolink standard. Whilst if you instead route it into Bray, Metro standard won’t be possible, it will need to be street running tram.

    He is saying by routing it into bray, you are basically limiting the potential of the rest of the line. So it isn’t really about Woodbrook, but more about the rest of the line.

    Which is a good point, as the whole concept of extending service to Bray, really isn’t about serving Bray, it is about opening up the development land between Cheerywood and Bray.

    With Bray likely to get a DART every 5 minutes, it doesn’t particularly need Luas. Though I appreciate it could be helpful for the Western side of Bray.

    To be honest I can see and appreciate both arguments, I’m in two minds about it myself, so to be clear I’m not arguing for either idea, just explaining the thinking.

    A lot of this depends on if the Green line gets upgraded to Metrolink and if they what to extend that south of Sandyford, etc.



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  • Registered Users, Registered Users 2 Posts: 1,885 ✭✭✭spillit67


    These are ifs and buts. The line south of Sandyford cannot be Metro standard as is so any notional cost needs to consider the upgrade of that.

    Woodbrook is a crap location even for Metro. There is no longer the space for a large park and ride facility and it will end up continuing to feed traffic north. As is the Bray North exit basically goes onto a country road at Old Connaught and would just feed a load of traffic into the entrance of Bray that is already completely over capacity. It is basically there or the Shankill exit thus a complete reworking of the road network would be required and good luck at that considering how Bus Connects has gone.

    The land swap with the golf course and the graveyard makes further development there challenging anyway.

    Now maybe the argument is that Woodbrook is just a dead zone stop station and you build a P&R further north to the West of the Motorway but I just don’t get it. Why would you spend that much money on something that doesn’t actually connect properly to one of Ireland’s largest urban areas and continue to encourage car use.

    Even still there’s actually a fairly easy way that Metro grade could be brought into Bray and it would involve CPO’ing from the Windsor dealership to the Circle K, probably 14 houses and 2 businesses. Run it elevated there and it has no issue with getting into Bray. They are already CPO’ing part of these lands for Bus Connects, tbh I don’t get why they didn’t do something more extreme to improve access to the town. Woodbrook would 100% require tunnelling at this stage, I’m not sure where this idea of treading it overground has come from.

    The best solution is just the Luas to Bray Daly with a P&R at Fassaroe as a spur. This encourages public transport use around a central hub, encourages urban living and provides P&R access. Win win.

    If they ever put in an improved line from Sandyford to Cherrywood (like actually utilising the old more direct route) then that Luas would benefit from it. I don’t see the necessity for Metro that South.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 24,360 Mod ✭✭✭✭bk


    To be honest I think you are pushing the importance of connecting Bray too much. Bray is already one of the best connected towns in Ireland with DART. And that is to be increased to 5 minutes frequency!

    Let’s be honest Bray doesn’t really need Luas, extending Luas to Bray really doesn’t have anything to do with Bray, Bray would just happen to be the terminus. It would of course allow for a useful connection.

    Your comments have you looking at Bray and Woodbrook too much, over looking at the big picture of the entire line.

    The line south of Sandyford cannot be Metro standard as is so any notional cost needs to consider the upgrade of that.

    That is just as true for Ranelagh to Sandyford, pretty much non of the Greenline is Metrolink standard now. There isn’t anything about the section South of Sandyford that would preclude it from being converted to Metrolink. Of course it would cost more, as more stations would need to be upgraded, but that would just be a CBA.

    Of course earlier, I was suggesting that maybe the Green line might not be upgraded to Metrolink and instead capacity increased on it with 90m trams. If you were to take that approach, it would be more compatible with Bray.

    I suppose stepping back from this and looking at the bigger picture, there is now uncertainty on what the future of the Green line looks like. Stay 55m trams, switch to 90m trams, upgrade part of it to Metrolink, etc.

    I don’t think there is any certainty now, which might allow for different options to be considered.



  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    Woodbrook could be reached following the original Harcourt Railway alignment. It's mostly still clear. A small amount of straight line cut and cover would be required at Cherrywood. A small amount of CPO would also be required but it's an open goal having that alignment 90% clear.

    Metro along the original alignment to Woodbrook to provide DART← →Metro interchange, not to serve Bray Daly with a second high frequency rail connection. Anyone living near Bray Daly can wait an average of 2.5 minutes for a DART and Bray and then change at Woodbrook with another average wait of about 90s.

    By taking Metro to Woodbrook it allows commuters from SOUTH of Bray to take a DART from Greystones (might be extended further south some day) and change at Woodbrook for Sandyford, Dundrum, south inner city etc. I'm looking at the network connectivity, not at serving a particular place, especially when that place can better be served by an alternative means:

    I think the western and southern parts of Bray would be served by metro at Daly about as well as they are served by DART today-not very well at all. The N11 Luas could branch at Sandyford and also continue down the N11 all the way to the western and southern parts of Bray, avoiding the town centre and the traffic there. The N11 Luas to Bray would pass under the Sandyford-Woodbrook metro and interchange could be provided there. It does not need to interchange with DART at all. That's much better than walking or taking a bus to Bray Daly IMO. You'd get into the city way faster.



  • Registered Users, Registered Users 2, Paid Member Posts: 1,736 ✭✭✭Consonata


    There are a bunch more level crossings and at grade running south of Sandyford than there is north of it. Its designed in such a way that makes it quite difficult to convert to Metro grade.



  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    I would keep all that as a tram route and plug everything south of the depot as far as Carickmines into a branch off the N11 Luas and terminate the Luas at Carickmines or just before it. It's no use as a metro line and converting the original alignment opens up new land banks. I'd use the original alignment for the metro extension south of Sandyford to Woodbrook (and someday on to Bray Daly for the folks who really think this is necessary ;-) I wouldn't say no to it, just don't think it adds much connectivity as it entirely parallels the DART which will be near metro frequency). Leopardstown is going to fall to development some day, just like the Phoenix Park did. Some of the overflow carparks already are. A huge amount of mixed use land could be developed at Leopardstown. There will be demand to reach it from the south east, there's likely already decent demand to reach the existing commercial sites there from the south east as is.



  • Registered Users, Registered Users 2, Paid Member Posts: 1,736 ✭✭✭Consonata


    I agree with this broadly. Metro to Bray is also the best way to improve capacity north and north west in particular, and after Dart+ there is basically no way to improve that alignment.



  • Registered Users, Registered Users 2 Posts: 1,885 ✭✭✭spillit67


    So Bray is one of the best connected towns and you don’t bother going an extra few hundred metres there?!

    Believe it or not, there is actually huge development potential there and lots ongoing which of course directly connecting it to the towns along the Green Line would further help. Oh no though, let’s connect to a graveyard and a golf course! This is simply bizarro thinking and lacks basic grasp of how to build dense urban areas.

    I am looking at the big picture. You don’t have a rashers about the actual area. There is no simple connection to Woodbrook - there IS in Bray. Go have a gander at the Dargle river and look at the great big golf club currently getting developed. Said planning has had to retain lands for the Luas and the Transport bridge.

    This is not the case at Woodbrook. Again given you are clearly ignorant of the area, you won’t be aware that a major land swap was done with that golf club for the site of the existing station. The area right up to the station currently has apartment blocks being constructed on it. There is no space for a simple connection. Go drive out there now and tell me where the simple connection is for more rail overground- it isn’t there anymore, the focus shifted further south which was always the rational decision.

    If you look at the maps for a couple of decades ago it might have made sense to restore the halt, that didn’t happen. Now instead we have the chance to connect a major town and transport hub to the east and put in a P&R through fields to the West. All further south on the M11 to mitigate traffic flowing north onto the M50. No brainer.



  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    Everyone is entitled to their own opinion. I'm sure you have an opinion on things you neither live nor work near. Why don't you sketch your proposed Bray metro route so we can all see exactly where YOU think it should run?



  • Registered Users, Registered Users 2, Paid Member Posts: 1,736 ✭✭✭Consonata


    I think it following the old railway alignment is possibly the cleanest way of doing it, and CPO the houses as needed.



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  • Registered Users, Registered Users 2 Posts: 19,301 ✭✭✭✭murphaph


    Agree 100%. Other cities would love to have that problem to be able to extend a metro to meet another (effective) one. Bit of CPO, short bit of C&C tunnel through Cherrywood because they failed to preserve the alignment there.



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