[Articles] DART Underground

Mark Gleeson · 08-07-2010, 14:59

Subject to funding...

With the move to Inchicore its a lot cheaper and easier to do. Its separate

Some of it can be done without planning permission

ACustomer · 08-07-2010, 15:29

If the link between the 4-track KRP and the Underground is not done properly, then you will have 2 massively expensive projects with a huge reduction in capacity because of a bottleneck junction which will cost much more to rectify at a later date as opposed to doing it as part of what in reality should be one project.

Why is there no joined-up thinking? Reminds me of the city-centre DASH project where the most congested part of the system is neglacted.

You couldn't make it up.

CorkALVIN · 08-07-2010, 17:30

One suggestion here is that the proposed tunnels should be built to Berne Gauge so as to allow doubledeck rolling-stock which might become necessary for increasingly busy commuter routes, as well as standard Berne-Guage freight containers and wagons to enable the use of the link for freight at offpeak times. This should also be considered as of potential benefit if a fixed Britain-Ireland rail link is ever built, which would also require some kind of 'Talgo' dual rail-guage Intercity carriages and wagons; after all, such a project as the Dart Subway tunnel will have at least 100 years working life ahead of it.

finnyus · 09-07-2010, 10:00

Quote:

Originally Posted by ACustomer

If the link between the 4-track KRP and the Underground is not done properly, then you will have 2 massively expensive projects with a huge reduction in capacity because of a bottleneck junction....

The junction with the tunnel at Inchicore will have to be grade separated, to make sure that no disruption to the traffic in-and-out of Heuston. In Osterfeld, Stuttgart, which was station not so long ago, was the starting point of a section of 4 tracking (similar to the KRP). Google Maps Link. Like the KRP, the outside tracks are the fast tracks, and the middle tracks are used for the stopping trains. The link above shows the point were the middle tracks enter the tunnel to travel under the city, and the outside lines continue above ground towards main station - no conflicts, as the junction is completely grade-separated. Would something like this be possible @ Inchicore? Have the initial track plans started yet?

Mark Gleeson · 09-07-2010, 10:03

A grade separated junction is provided for in the future at Inchicore

The details are all available online

finnyus · 09-07-2010, 10:07

Quote:

Originally Posted by Mark Gleeson

A grade separated junction is provided for in the future at Inchicore

So initially to access the tunnels, will be over a flat crossing?

Mark Gleeson · 09-07-2010, 10:13

It will be grade separated from day one

The section south of Inchicore is a separate project

Its clearly shown in the plans as being grade separated but separate

ACustomer · 09-07-2010, 11:46

But look at the other end (East Wall Jcn): a right mess and as far as I can see a flat junction.

08-07-2010, 14:59	#1
Mark Gleeson Technical Officer Join Date: Dec 2005 Location: Coach C, Seat 33 Posts: 12,669	Subject to funding... With the move to Inchicore its a lot cheaper and easier to do. Its separate Some of it can be done without planning permission __________________ Unhappy with new timetable - let us know

08-07-2010, 17:30	#3
CorkALVIN New to the board Join Date: May 2010 Posts: 19	Dart Subway Route One suggestion here is that the proposed tunnels should be built to Berne Gauge so as to allow doubledeck rolling-stock which might become necessary for increasingly busy commuter routes, as well as standard Berne-Guage freight containers and wagons to enable the use of the link for freight at offpeak times. This should also be considered as of potential benefit if a fixed Britain-Ireland rail link is ever built, which would also require some kind of 'Talgo' dual rail-guage Intercity carriages and wagons; after all, such a project as the Dart Subway tunnel will have at least 100 years working life ahead of it.

09-07-2010, 10:03	#5
Mark Gleeson Technical Officer Join Date: Dec 2005 Location: Coach C, Seat 33 Posts: 12,669	A grade separated junction is provided for in the future at Inchicore The details are all available online __________________ Unhappy with new timetable - let us know

09-07-2010, 10:13	#7
Mark Gleeson Technical Officer Join Date: Dec 2005 Location: Coach C, Seat 33 Posts: 12,669	It will be grade separated from day one The section south of Inchicore is a separate project Its clearly shown in the plans as being grade separated but separate __________________ Unhappy with new timetable - let us know

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08-07-2010, 15:29	#2
ACustomer Really Regular Poster Join Date: Jan 2006 Posts: 767	If the link between the 4-track KRP and the Underground is not done properly, then you will have 2 massively expensive projects with a huge reduction in capacity because of a bottleneck junction which will cost much more to rectify at a later date as opposed to doing it as part of what in reality should be one project. Why is there no joined-up thinking? Reminds me of the city-centre DASH project where the most congested part of the system is neglacted. You couldn't make it up.

09-07-2010, 11:46	#8
ACustomer Really Regular Poster Join Date: Jan 2006 Posts: 767	But look at the other end (East Wall Jcn): a right mess and as far as I can see a flat junction.