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This Speculative Diagram on how a UK-Wide High-Speed network could look like.

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PGAT

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I’m sorry Heathrow to Clapham Junction? Where are they going to find room for that?
 

Bevan Price

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Someone living in Dreamland ??
No way I can ever see enough traffic for a HS7 line across England into East Anglia.
 

Bartsimho

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If there ever were to be a tunnel between the UK and Ireland it would be from Holyhead to just north of Dublin.
I don't think it would be more likely than a Stranraer to Bangor tunnel (Very unlikely with the Sea Depth between the UK and Ireland)
 

PTR 444

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Not too dissimilar to my idea from 2019 except without that Birmingham - Norwich high speed line:


I also agree with a South Coast HSL except this should go via Brighton if being built to HS1 speeds. Manchester - Sheffield is good for a high speed flow but this may be better utilised by sending trains up to Leeds and then back down the Eastern HSL.
 

SynthD

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It’s a strange mix of existing lines rebranded with new builds. It runs the full gamut of rationality. NI via Edinburgh is the biggest surprise.
 

Bartsimho

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Not too dissimilar to my idea from 2019 except without that Birmingham - Norwich high speed line:


I also agree with a South Coast HSL except this should go via Brighton. Manchester - Sheffield is good for a high speed flow but this may be better utilised by sending trains up to Leeds and then back down the Eastern HSL.
Maybe a split-route. Liverpool-Manchester common route then Manchester-Bradford-Leeds and Manchester-Sheffield-Doncaster with a Doncaster-Goole-Hull and a Leeds-Selby-Goole-Hull reconnection. A link from Doncaster to Selby as well before it continues North from Selby-York-Middlesborugh-Sunderland-Newcastle-Edinburgh route.
Unfortunately the Geography of the West Coast would mean big tunnels but a Liverpool/Manchester-Preston-Carlisle-Glasgow route could be done
 

PTR 444

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Maybe a split-route. Liverpool-Manchester common route then Manchester-Bradford-Leeds and Manchester-Sheffield-Doncaster with a Doncaster-Goole-Hull and a Leeds-Selby-Goole-Hull reconnection. A link from Doncaster to Selby as well before it continues North from Selby-York-Middlesborugh-Sunderland-Newcastle-Edinburgh route.
Unfortunately the Geography of the West Coast would mean big tunnels but a Liverpool/Manchester-Preston-Carlisle-Glasgow route could be done
You probably only need one Anglo-Scottish high speed line north of the M62, so it’s either a choice of going up the West Coast or East Coast. If you go with the former, you’d still want an East Coast HSL as far as Newcastle, whereas if you only build the latter, you wouldn’t need another HSL paralleling the WCML north of Warrington. The East Coast route would also be much easier to build due to the flatter terrain.
 
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zwk500

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The line east of Birmingham to Norwich can be forgotten. There isn't even a motorway to Norwich, let alone HSR. Equally the M5-corridor line can be served with a link into the existing lines.
Moving the GWML to Waterloo makes zero sense as theres no way to expand Waterloo or build the line to it.
The suggested HS3 is interesting because it's basically the TRU until suddenly veering of to Market Weighton. The connection from Manchester to Sheffield would be nice but isn't going to wash it's face.

I also agree with a South Coast HSL except this should go via Brighton if being built to HS1 speeds.
No. Brighton services need to stop at East Croydon as well, and that's only 35 miles from Brighton so you would spend such a small amount of time at High speed it's not worth the costs.
You probably only need one Anglo-Scottish high speed line north of the M62, so it’s either a choice of going up the West Coast or East Coast. If you go with the former, you’d still want an East Coast HSL as far as Newcastle, whereas if you only build the latter, you wouldn’t need another HSL paralleling the WCML north of Warrington. The East Coast route also be much easier to build due to the flatter terrain.
I can see the sense of this. I'd personally terminate the eastern HSL just south of Newcastle and use the existing route onwards to Edinburgh, with a full HSL on the western side, as the benefit is greatest on that route - it's shorter, closer to Glasgow and the freight gets hammered on the classic line over the hills so separating express and slow traffic on that side is more important than on the Eastern side.
 

The Ham

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I like it although it's strange that they extended HS2 all the way to Northern Ireland...

There's several oddities.

HS2 is doing a lot of heavy lifting. Either that would require 4 tracking or you'd be better off with a separate East Coast HS line.

Why Waterloo?

HS4 and HS5 don't serve anywhere between Bristol/Southampton/Portsmouth and London. There's a lot of options of places it could serve, my preference would be somewhere like Salisbury, and whilst this would add journey time to Portsmouth and Bristol it would create the option to run between Birmingham - Bristol - The South Coast (increasing the justification of the Bristol/Birmingham section).

Much more than the Dawlish Avoiding Line South of Exeter would be unlikely (a through line between it and the Birmingham route is likely), as it's a lot for (at a guess) 5tph.

Not sure how Sheffield (population of 600,000) justifies 2 lines, when a Birmingham to Liverpool via Sheffield and Leeds service wouldn't be at that much slower but cater for a much wider range of journeys.

I'm sure there's other stuff too, but that's probably enough for now.
 
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