Reading through this thread has reminded me of why I stopped posting on this forum and now only use it to research current events on the rail network. An awful lot of nonsensical gibberish written by people who have little idea about what they are describing and to whom common sense is something only they posess. Yes, it may be obvious to you that it is a stupid idea. But if you actually pull your head out of your trousers for one minute and give the subject a little bit of THOUGHT, you may appreciate why aspects of this plan are actually very sensible indeed. I am not suggesting for one minute that the plan as it stands is perfect - it most certainly is not - but with a number of tweaks, could be tailored to suit the line perfectly.
whoshotjimmi, as your comment immediately followed mine can you tell us all why you consider the point of my comment 'nonsensical gibberish'.
The idea verges on barmy from a technical point of view as many on here have already observed. Why, they don't even propose to retain the same method of traction collection that the stock currently uses.
The portrayal of these trumpeted proposals in the media announcements appears so ill thought through as to seem amateurish in concept, yet risks injecting delay into some properly thought out proposal to improve the service for the suffering folks who use it. Why sure, it makes use of rolling stock arguably not yet at the end of its life, with as you say, a favourable seating layout. But that's about the limit of any semblance of sensibility. It's all very well for these groups to come up with a 'good idea' but there are costs involved in bringing these so called good ideas anywhere near to fruition. Who precisely is going to be paying for what will utlimately result in failure of this proposal to see the light of day as currently conceived because of fundamental engineering challenges that seem to have been grossly oversimplified. The worrying thing is that if St Teresa is already giving it the time of day money is already being spent seemingly in ignorance of the flaws in the proposal.
To my mind the powers that be driving this agenda need to decide the following;
Tramway / Light 'Metro' Rail or retain 'heavy' rail solution?
As they have proposed re-use of the LUL stock then for arguments sake let's assume the latter. The list below provides a quick overview of what is likely to be needed;
(it is assumed that trains will run on the same lines as today - i.e. shared occupation with mainline rolling stock)
Rolling stock traction mods for 3rd rail / side contact.
Product acceptance certification to run trains on NR Network (possible modification of existing certification)
Safety Case for revised application (Electrical system compatibility with existing network systems, crashworthiness studies, fitting of Safety Systems (AWS, TPWS, OTMR or alternative systems???)
Provision of Traction Power Supply from Electricity Network
Guaging and clearance works.
Rolling stock modifications (e.g. toilets)
Installation of 3rd Rail contact rail (ignoring any ORR / DfT issues relating to extension of 3rd Rail traction to this geographical area)
Signalling costs.
Line of route will require signalling to be modified to address immunity from stray DC traction current (in effect resignalling of older signalling installations).
In areas of shared running, e.g. Leeds and York;
Provision of Trainstop technology (as per shared running sections on Bakerloo, Metropolitan and District lines) will require fitting and incorporation into signalling in addition to existing AWS / TPWS.
Wholesale signalling immunisation (dual immunity) - currently only AC immune.
In essance, the above (and there will be other costs which I have not included, that I can be certain) suggests the proposal introduces many significant avoidable costs with little obvious benefit compared with alternative options of diesel traction or conventional AC traction which would be compatible with the existing network. Moreso, they end up with a non-standard system using trains already near the end of their working life which will require renewal in not too many years (a decade or two at most?)
Therefore respectively, before I (and others) are requested to remove my head from my trousers (painful) maybe you could explain where your head is if you still think the idea has merit- perhaps?