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LUAS Network + Future Expansion

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  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    At a 3 minute frequency at peak hours, they are already pretty much at maximum frequency for a non automated, non fully segregated tram system.

    If you want more frequent that that, then you are talking Metrolink.

    So if you put shorter trams on it, you just end up with less capacity as you really can't do more frequency even if shorter, the real constraint is crossing junctions and traffic lights.

    BTW there are plans to do 2 minute frequency on the Green line, but only on the Southern end of the line between Sandyford and Charlemont and only with them closing all the crossings to make it fully segregated, which shows what is needed for higher frequencies.



  • Registered Users, Registered Users 2 Posts: 247 ✭✭PlatformNine


    I couldn't put it better than BK if I tried. Frequency can't be increased without some major upgrades first so there is no "shorter trams but higher frequency" just lower frequency. But also an important point people keep missing, our tram system isn't X countries tram system. The best vehicle for our tram system is the one that fits our tram system's design. Ours is designed around long high capacity and high frequency trams, and large portions of our system are grade separated because of it. So that's what we buy, like other's have said it is more of a metro-lite or RT-lite than it is like many other countries' tram systems.

    Ah that makes more sense. I was wondering how they would get the green line to 30tph without bringing the red line to a standstill at Abbey street. I do wonder how that is going to work though, from my memory SSG was always one of the busiest stops. I suppose if it is just a few extra trams and they aren't replacing existing Broombridge or Parnell services it can only increase capacity? At the very least it should decrease journey times between Sandyford and Charlemont, and help prepare the line for the metro upgrade if it ever happens.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    Ah that makes more sense. I was wondering how they would get the green line to 30tph without bringing the red line to a standstill at Abbey street. I do wonder how that is going to work though, from my memory SSG was always one of the busiest stops.

    There is a document about it online, but going off memory, I think they were suggesting building a turn back at both Charlemont and SSG, so SSG would get increased frequency too, but just not the full 30tph that Charlemont would get.

    Of course folks can swap to Metrolink at Charlemont, so perhaps that would also help take some pressure off SSG.

    With Metrolink in place, I think we will see the Green line acting less as the backbone of North to South PT in Dublin as it does today and instead more like supporting Metrolink. Like if someone is going from say Sandyford to Parnell St, I'd say they will switch to Metrolink as soon as they can, rather then stay on the slower street running sections of the Green line through the city center.



  • Registered Users, Registered Users 2 Posts: 2,332 ✭✭✭KrisW1001


    Parts of Green can easily handle 30tph, but the central section definitely cannot. But - and I promise this is the last time I’ll harp on about my idea for new short segments - one way to address the capacity mismatch in the medium term (i.e., until Metro subsumes the Harcourt St Line section of Green) would be to provide multiple routes for Green trams through the city centre: the alternative is for many of the trams along the faster stretches to stop at the edge of the slower city centre stretch, which is much less useful when a large number of passengers probably wanted to cross the Liffey as part of their journey.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    Well the obvious solution for the Green line is for those people to swap onto Metrolink, it would get you through the city center much faster.

    It is the red line and potential Lucan or other East - West lines that would be the issue. Sure, you can do the same with the East - West lines, split them in the city center, but if you have multiple crossings of the Green line, bus routes or future North - South Luas lines, you are just going to run into capacity issues with the junctions and impacting each lines services as already happens on OCS.

    Of course the ultimate solution would be Dart Underground or an East - West Metro to do the same as Metrolink.



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  • Registered Users, Registered Users 2 Posts: 247 ✭✭PlatformNine


    That's true, in that case I guess we can really hope ML breaks ground sooner than later, and that some design for the Sandyford-Ranelagh metro upgrade/tie-in is pushed forward (where has that plan even gone?)? A replacement allignment from Harcourt to Sandyford would be required, I think the 2042 plan mentioned an allignment around UCD. Plus the metro-upgrade ever happens it might even be possible to reclaim the old allignment between Sandyford and Carrickmines and continue the metro upgrade through Bride's Glen.

    Maybe but I don't think it makes a ton of sense to have all the lines funnel together only after it passes the highest density areas. I think it makes more sense to continue work on the ML-Green line tie-in to take full advantage of the capacity along the line, or just work on ways to increase capacity for other sections of the line.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    For the moment, it seems converting the Greenline to Metro is on hold. Instead the plan for now seems to be to upgrade the capacity with the 30tph we mentioned earlier and with a parallel UCD line also taking strain off it.

    I'm kind of hoping that when Metrolink opens, it will be so successful that people will be screaming for the Greenline upgrade to Metro, kind of like what happened with Luas Cross City.



  • Registered Users, Registered Users 2 Posts: 247 ✭✭PlatformNine


    thats probably for the best. if we get a new allignment before work starts, than at least the green line doesn't have to shut down, just that section, which with how vital it is and still will be during the ML-green line connection, it probably isn't the best idea to completely shut down that line for potentially multiple years.



  • Registered Users, Registered Users 2 Posts: 2,332 ✭✭✭KrisW1001


    Yes, any attempt to upgrade Green Line without a parallel tram route already in place would create a minimum of two years of traffic chaos (I am aware that the schedule has the line is fully closed for only 9 months, but it will be severed for three years, and forcing a 15-minute walk between disconnected stations mid-journey to the city centre will push onto bus or, worse, car instead).



  • Registered Users, Registered Users 2 Posts: 96 ✭✭The Mathematician


    I'm hoping for even more, I think what we should be aiming to do when the metro is built is to keep the contractors working on the second metro, and so on for the third metro etc. That will be a lot cheaper in the long run than stoping and then starting again years later.



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  • Registered Users, Registered Users 2 Posts: 1,387 ✭✭✭gjim


    It's not accurate to say that trams in Amsterdam are used like buses in Dublin. Buses in Dublin are generally used for longish journeys between suburbs and the core, while the tram lines in Amsterdam are typically used for shorter journeys and provide mobility for getting around the core of the city.

    Also while they have 5 metro "lines" there is a lot of alignment sharing between them so the coverage is less than you'd imagine. Still.. Dublin can only dream. Quite a bit of heavy lifting is done by heavy rail also in Amsterdam - although no interconnector - Amsterdam has terrible geology for tunnelling.

    You're right that Luas is not a normal street-tram but a hybrid system maybe like some of the Stadtbahn systems.

    But I don't see this as a particularly good thing - 55m trams on busy city streets are simply not a good idea. The reason we've ended up here - and I'm just repeating myself - is because of the lack of alternative radial capacity into the city so we've had to push the single central N/S tram almost to breaking point. If we had multiple tram lines bisecting the centre (an idea I recall you suggesting was crazy!), then we wouldn't need to be fooling around with 55m trams on busy city streets.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    While Amsterdam does have a bunch of shorter tram lines, it also has ones which are 15 and 16km. They have been extending their old tram network and it is becoming more Luas like. Citywest and Lucan are both 15km, so very similar.

    If by extra radial capacity you mean building a network like the T42 one, then fair enough. But if you are talking about a bunch of very short lines that don’t even make it to UCD or beyond Griffith Avenue, well not so much!

    I mean many of the new lines in the T42 plan aren’t even that long, Clongriffin, Balgriffin, Sandyford (via UCD), Knocklyon, Blanchardstown, are all about 10km. Finglas 7km. To put that in context, you can cover 10km in 25 minutes on an e-bike!

    Also I think you might be overlooking why the Greenline is 55m, it is because much of the original Greenline was built on a former rail track, thus it had a high degree of segregation which allowed for longer trams and higher speeds. A service that is more metro lite. That is why the Green line is proposed to stretch further south, it is faster and higher capacity, so can handle it.

    It would be silly not to take advantage of that even with a more extensive network and say go back to the chaos of the 40m trams, all it would mean is less capacity on the route and overcrowded trams.

    Of course, really the Greenline to Sandyford should be upgraded to Metro and then the remaining Greenline to Finglas etc. might get away with 40m trams, but realistically it wouldn’t make much difference, you still have relatively long vehicles negotiating many junctions in a city center.



  • Registered Users, Registered Users 2 Posts: 156 ✭✭OisinCooke


    If that is the case in terms of starting construction on the UCD line before the Sandyford Metro connection, so as to provide an alternative route into the city, I’d be very pleasantly surprised!! It’s just nuts that they expected to close arguably the busiest transit corridor in the country for even only 9 months and expect busses and the private car to take the strain so this makes far more sense.

    I feel like in the grand scheme of things, Luas Sandyford (via UCD) is a relatively easy win. Very little CPO-ing will be needed as between Stephens Green, down Leeson Street, Morehampton Road and through Donnybrook, the current bus lanes can just be turned into tram lanes on either side of the road. Once at Donnybrook Bus Garage, both tracks should converge to be on the same side of the carriageway though and the Stillorgan DC should be reorganised. There is a centre grass meridian most of the way as well as grass verges on either side which can all be removed to create more road space and potentially not compromise the existing layout of a bus lane and two car lanes in each direction. However at the very worst it would be one bus lane and one car lane in each direction. Arguably there isn’t as much of a need for a bus lane with the Luas (with a Bray extension also in place) taking much of the passenger strain off of the bus services operating that route - UCD (39A) and Bray/Ballywaltrim (145) to City Centre - so two car lanes could be used instead. I do think there should be ample space for the same layout as currently though, with a bit of reorganisation of the meridians

    Presumably once the new Luas line reaches the Brewery Road junction it would follow it down to a new Sandyford interchange station on the opposite side (road side) of the depot and then rise up to join the elevated section of the Green Line over the large road junction before continuing to Central Park and on through Leopardstown and toward Bray.

    On a side note, I presume the Luas depot will be moved from its current Sandyford Location to one on a Greenfield site south of Brides Glen when the UCD reroute and Bray extension are taking place as I don’t see how a Luas UCD could be constructed to allow easy depot access without interfering with ML… And there’s no need for the depot to be upgraded to an ML one as they’ll have ample space in Dardistown, plus the site is far too small for a Metro depot.

    Presumably it will be moved and the ML Sandyford station can be built on its site, with easy access to Blackthorne Avenue at one end of the station and access to Brewery Road and the new Green Line station at the other end…?



  • Registered Users, Registered Users 2 Posts: 156 ✭✭OisinCooke


    While I agree here as well with not having lines stretching halfway towards the canals and no further, there is a lot to be said for short interconnecting lines, ie, Heuston and James’ to College Green/Stephens Green (linking red and green) as well as other alignments that while they are short and don’t add radial capacity, they open up new parts of the city centre for trams, increase city centre capacity, and provide alternative routes for all the existing and future radial services to minimise congestion and crossover and open up flexibility. Another such route could be another North-South link between Broadstone, down Constitution Hill and onto The Liberties to connect some future northern radial route (Balgriffin/Clongriffin) with a potential future route south (Terenure/Crumlin) while also linking current tram routes, ie GL and Luas Lucan.

    There should be no random stubs of lines that end on random streets inside the canals, but connectors which will not only be useful now in providing alternative routings to open up more city centre destinations or provide diversion routes (eg, the Green Line, the only north-south alignment, grinds completely to a halt whenever any sort of parade or protest or march is happening on O’Connell Street) but also will strengthen the case for opening up new radial lines, as the city centre infrastructure, arguably the most controversial and difficult bit, will already be complete and construction can just begin in the suburbs.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    Absolutely. To be clear I've zero objections to more lines in the City Center, my criticism was more aimed at the "stub" lines as you well call them. It is obvious if we add a lot of radial routes, we will have to add capacity in the city center.

    I've mentioned previously that I suspect the T42/50 plans don't really go into detail on extra city center lines, because of sensitivity about the bus gates on the quays, the perception of cars being banned from the city and all that. No point ruffling feathers now for lines that might be 10 to 20 years off (unfortunately), but I'm sure they are part of the plans.

    BTW a suggestion that I've discussed in the past on another thread would be to route the southbound green line down O'Connell St. The advantage being better integration with the Metrolink station on OCS.

    But of course leave the line at Marlboruough Street, perhasp even add a Northbound line so it can be used as a backup when their are parades/protests on OCS.

    In the T42 map it also looks like the Balgriffin/Swords Road line goes down Gardiner street.

    Then there is the pretty obvious suggestion of using the quays for increased East - West capacity. Turn the bus lanes on the quays into mixed Luas/Bus lines.



  • Registered Users, Registered Users 2 Posts: 156 ✭✭OisinCooke


    I’ve always been a big believer in routing both tracks of the Green Line down OCS for that exact reason, possibly combined with moving the Abbey Street stop on the Red Line to as close to OCS as possible, maybe outside the Oval Bar or PTSB and creating an actual Red and Green interchange station at OCS - seems like a nobrainier to me and I always thought they really chickened out by not running both directions of the GL down OCS from the start. A metro entrance could be added at this new OCS interchange stop too so even though the station is outside the OCS Upper stop, passengers on the Red Line can walk in an underground sheltered passage to the station from OCS Station. Similar in the way that many of London’s tube stations have entrances which are actually quite far away from the platforms but because passengers have “entered the station” the walk does not matter at all. Making passengers walk above ground up OCS would have the opposite effect, especially in the rain…



  • Registered Users, Registered Users 2 Posts: 18,627 ✭✭✭✭LXFlyer


    No it couldn't, as buses have to swing out to get into Busaras.

    There is not the roadspace for it there.



  • Registered Users, Registered Users 2 Posts: 64 ✭✭Brightlights66


    To my recollection, this board has been through this discussion before.

    Central areas of, say, Berlin and Helsinki, run at least 30 trams per hour, per direction, in central areas which are not fully segregated and are (obviously) not using automated systems.

    On the Green Line south of Charlemont, for example, the current rate of 20 tphpd or so seems to be able to comfortably handle the present volumes.

    COVID has certainly changed work patterns, and one would wonder about the sense of closing this line for what might be a considerable time - perhaps as much as two years - to provide a proposed increase in capacity well beyond what it seems is needed. The current official capacity limit on this section is 24 tphpd, and it seems pretty obvious that it is fantasyland to imagine that even that level of Green Line tram throughput would be in any way full under these new circumstances.

    Replacing a LUAS between Sandyford and Charlemont with a metro will not increase speed in this section. It will increase capacity, but is there a desire for more capacity in this section?

    Any replacement of LUAS with a 'metro' would involve a significant period of closure - to achieve what exactly?



  • Moderators, Sports Moderators Posts: 29,181 Mod ✭✭✭✭Podge_irl


    And this board has also been over that running multiple lines, with much smaller trams, through brief shared spaces at 30 tph is wildly different from running them along a whole line as elements such as bunching are far less relevant.



  • Registered Users, Registered Users 2 Posts: 64 ✭✭Brightlights66


    Podge Irl, as you can see from the DART line, it'd be much easier to run just the DART line, without any pesky Enterprises or Sligo, PPT, Maynooth or Dunboyne trains crossing their path.

    It is ludicrous to suggest that it is easier to run multiple intersecting lines into a common 'tram' section than it is to run a continuous 'train' along that section. That is just absurd, and I would be grateful if you point me towards such a discussion that you allege has happened on this board

    Dublin has longer trams on the Green Line because it has failed to develop other competing tram lines: a city like Dresden, which I'm told is unsuitable for underground development, has tram lines everywhere, so that you're never really more than about 800 metres from a tram. Thus, they don't need to have such long trams: everywhere is covered, pretty much, and everywhere has a regular 5-10 minute service into and around that city.

    But, back to the Green Line south of the canal: is more investment needed (i.e. replacing the current LUAS with a metro)? There would certainly be a period of disruption, and I think some figures will be required to see if such disruption makes sense in terms of (a) increased speed and (b) increase in needed capacity.



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  • Registered Users, Registered Users 2 Posts: 309 ✭✭Greengrass53


    Have we had any decent infrastructural project since luas/ port tunnel.?



  • Registered Users, Registered Users 2 Posts: 1,215 ✭✭✭Busman Paddy Lasty


    The bridge at New Ross is epic. On a lesser scale the extra runway at the airport, neither public transport obviously.



  • Moderators, Sports Moderators Posts: 29,181 Mod ✭✭✭✭Podge_irl


    The main problem is bunching. In everywhere where they run these 30tph, what you actually get on the shared sections is multiple trams right behind each other. But because they have ultimately different routes it doesn't matter and because the trams aren't as large often two can be at the platform at the same time. Bunching on an end-to-end line with huge trams completely messes up the actual frequency and capacity on the line.



  • Registered Users, Registered Users 2 Posts: 247 ✭✭PlatformNine


    COVID and WFH are the only reason it currently isn't over capacity. Its managing for now but its often packed tram after packed tram, and as the city grows its going to be over capacity within the next few years without improvements. If the gov decided over night to immediately start building tram line after tram line, its still going to be more than a decade before we start to see improvements on that corridor, as priority will go to areas without a tram system. Even in the best case scenario the green line is going to need capacity improvement before another line/system is able to increase capacity.

    Also the massive benefit of the metro extension is we have an old heavy rail allignment that is mostly segregated and is capable of a higher capacity than what a tram system is normally designed for. It doesn't make sense to not convert it to a metro and reroute the green line where it isn't possible to send a metro. It would allow for the area to grow more in the future as the public transport system will have the capacity for it.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    Well Busaras is a kip, that is too small for the number of coaches trying to use it now. I know it is a listed building, but it should be closed as a bus station, converted to offices, etc. and a new bigger coach station found.

    You could then move the Luas. You could even possibly put the Luas on the East side of Busaras, so it would be closer to Connolly while having the longer platform.



  • Registered Users, Registered Users 2 Posts: 18,627 ✭✭✭✭LXFlyer


    That's not quite true.

    The longer trams have made a massive difference.

    Also, the alternating service pattern of Broombridge-Sandyford and Parnell-Brides Glen ensures that there is more than sufficient capacity on the core section between the city centre and Sandyford.



  • Registered Users, Registered Users 2 Posts: 18,627 ✭✭✭✭LXFlyer


    While I have long argued for a new bus station to be built, which would remove all of the city centre stops for inter-regional services and move them off-street, thus providing more space for the city bus operation, I think that given the listed nature of Busaras, it’s not going to going to be converted to anything such as you’ve outlined, and as such it may as well continue to be used a bus station for certain routes, albeit significantly spruced up on what is there right now.

    I’m not really sure what moving the LUAS stop actually achieves? It is already longer than the red line trams. I don’t think that the western half of Store St would increase platform length by very much given the radius of the curves.



  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    You can definitely convert listed buildings. Look at H&M, Smiles Dental Clinic on OCS (hilarious getting your teeth cleaned and looking up at the fancy glass roof), plenty of other examples.

    Busaras already has offices in the upper floors, so worst case just close it as a bus station and keep the upper floors as is. Ground floor could just be a fancy entrance, but keep the shops/restaurants or even expand them or convert them to the public office for the social welfare, etc. Of course all changes within the listed building status.

    I’m not really sure what moving the LUAS stop actually achieves? It is already longer than the red line trams. I don’t think that the western half of Store St would increase platform length by very much given the radius of the curves.

    I think people are suggesting you could put longer trams on the red line to increase capacity. And yes I'm aware that this stop isn't the only one constrained for space for longer platforms on the red line.

    BTW the platform there isn't actually long enough, it is missing the ramp on one end that every other Luas stop has, due to constrained space.



  • Registered Users, Registered Users 2 Posts: 14,077 ✭✭✭✭Zebra3


    I think I need a long lie down after reading Busáras is a listed building.



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  • Moderators, Motoring & Transport Moderators, Technology & Internet Moderators Posts: 23,497 Mod ✭✭✭✭bk


    Fun little fact Ove Arup was the lead engineer on building Busaras. He is the founder of the Arup Group, a major international engineering consultancy firm who works with Irish Rail and TII on projects frequently now, for instance they did the All Island Rail Review.



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