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Indeed, you probably only need 1 grid supply for the actual requisite power, 1 fs 2gsp is for N-1 contingency. But as you say, the supplies need to be independent, exactly what the level of independence is on the grid side I'm not sure. Probably adjacent feeder stations need to be in different...

Yeah I think it's reasonable to consider CVL to be contiguous but perhaps titled something like "sections between". The Scottish schemes seem to be wiring many 10s of miles contiguously, so you could more easily describe them as individual sections (the dotted sections in these maps):

Yeah, I do see in retrospect how much more strategic wiring at the Hull end would be - I didn't actually know there was a swing bridge at Selby. The only wrinkle is that this wiring would need to be N-2 contingent lest a battery 897 could be stranded. This means Hull-Gilberdyke would need to...

I'm quite surprised that GWML is already maxing out electrical capacity since it's fully AT. Unlike MML which has the feeding distances (and grid connections) of an AT systems but without any of the required tracskide equipment ("saving money") apart for Braybrook - Wigston for some reason, and...

Thanks for this, I was able to locate it online at this link (The Engineer, vol 201 issue 5226, 23 March 1956, p 261). I wonder from where 6.6kV power was sourced. The 1.5kV DC installation came with 33kV feeders so that would be my guess. Although at the same time it was only 4 years after this...

Another consideration is existing power supply. Although the ECML recently underwent a PSU, it was unfinished north of Newcastle and is basically only capable to reasonable supply the last big December timetable change. The infrastructure on the ECML as it currently is would not be able to...

Might have already been mentioned but I remember someone saying EMR (or EMT) sprinters had Ashby-de-la-Zouch programmed in for the proposed Ivanhoe line service

I found a very enlightening article on the opening of Glasgow North I'll link here (Railway Gazette vol. 113 iss. 19 4 Nov. 1960 p536) it's only 1 and a half pages, I'm not giving anyone homework here! But it makes the assertion that Parkhead feeder itself supplied 2x 25kV cables going to...

Yeah, quite a lot of genuine progress had been made up to building foundations, as well as the relevant permissions to upgrade the incoming grid connection to be 132kV 3 phase. I think I just about recall some excuse for the project's cancellation being a vague mention of "traffic flows...

Did the WCML North scheme utilise Motherwell feeder station? Because I think it was actually installed as part of the 1960 Glasgow South work. But at some point it was replaced with Gowkthrapple feeder. Did this happen under WCML North?

It seems like Mark II is on the Wemyss Bay/Gourock line. Glasgow is blessed with 2 highly niche OLE design types. Maybe more because of SICAT.

So would it have been not possible or prohibitively expensive to repurpose the terminals for parcels? Willesden to Newcastle and Glasgow were used by royal mail until recently, was that all letters?

I believe there's another niche overhead line variant in the Glasgow area known as Brown Boveari that's also just used on one line - i think the Neilston Line?

going back a bit, I always think of the original Railnet scheme as being such a tragic series of events. Somehow we were willing to invest loads in building all of the terminals and rolling stock, but then hardly used them. Imagine trying to convince anyone these days to build 9 rail/parcel...

Is this the mysterious "Mark 2" overhead line design? Or is that on another line?

That's very true, I was thinking about the Harrogate line which seems to have effectively no turnaround time in Leeds. The methodology in Scotland seems to run several miles of wires at the terminus end which basically negates this issue. Ah so useful battery charging can be achieved on 750V...

Thank you for sharing your expertise. I am very much of the lay people. But people also don't talk about battery degradation very much either. And what that means for whole life cost if the battery needs replacing only a third of the way into the lifespan of the vehicle. Sounds like just...

Yeah essentially there's no worry for running out of charge in any scenario as the engine has effectively infinite range for any problem that could arise. But in terms of there electric only fleet, the largest off wire-section I think is Caerphilly to Lisvane which is just under 3 miles. It's...

Yeah probably, perhaps also the fact that the OLE is just in the way even if it is off. There was actually a Track Sectioning Location (TSL) substation installed when PRDC was built called "Harlesden" located around "Railnet Junction", I'd imagine this allows the terminal to be fed from it's own...

Really? Surely they could arrange to temporarily switch off traction power, it's not like there are any services that want to use the terminal.