Craven Arms to Bishop's Castle was a basket case from opening and closed long before the Good Doctor came along.
That was
the one that was added to see if someone would spot it. Except that if Bishop's Castle has developed into or might into a major urban area (Archbishop's City?) the case could be there. We should learn from history but not be governed totally by it!
My suggestions Longer restorations from your list
All make common sense
Further Lines to Restore
There are some there which I
really wonder about - restoring lines though sparsely inhabited areas which may provider shorter routes for what are quote obscure journeys, or duplicating existing provision. Some duplication is desirable - one rail route to Plymouth is a very thin and shaky connection, for example, and in my view the strengthening of that into a second connection is more important that reducing journey time to Paddington to 180 minutes.
Freight to passenger
Some very good cases there. Also one or to more "preserved" to "daily including commuters"
Restoration of through route
Yes and no. You have routes which have a midpoint at which the traffic switches from being a major flow into something far less, and I really wonder if you want 'very light rail' sharing with frequent 6 car plus electrics.
New Line
Don't know it enough to comment
With the exception of Brynmawr and possibly Brecon all the proposals connect with existing lines at both ends. Thus providing an alternative route and allowing trains to originate and terminate on other lines.
A common sense element, whilst at the same time being careful to avoid providing a line that's really healthy at one end, and a basket case at the other which pulled the whole thing down.
There is also the possibility of putting in spurs to connect to lines which meet but don't have a junction. Like the rationalisation of Leeds and Lincoln.
Provided you have services and flows, yes.
The trains could be smaller than a bus, with a maximum speed of 50 to 70 mph, and are intended for threatened or reopened branch lines. I am surprised to see Portishead in the list - not only will demand be very high, but the MetroWest Rail project envisages services from Portishead to Severn Beach and Bath. Both involve substantial mainline running, especially Bath.
It was my list to start looking at what "5000 miles" could mean, and recent experience suggests to me that even the most unlikely cases has the distinct possibility of generating rather more traffic for something that's "smaller than a bus" and runs - I presume - not very often using a single line. In fact a huge concern must be the capital cost of setting up even very light rail and of maintaining it ... to some extent the concern is the cost per passenger, and to some extent the concern is a desire to over engineer and over complicate to the extent that something ceases to be viable.
Others I had, tongue in cheek in some cases, not yet mentioned included
Acton Town to South Acton
Alnmouth to Alnwick
Bristol to Radstock via Pensford
Bury to Backup
Dunton Green to Westerham
Fareham to Gosport
Halwill to Bude
Holborn Kingsway to Aldwych
Hull to Hornsea
Hull to Withernsea
Leuchars Junction to St Andrews
Lostwithiel to Fowey
Markinch to Leven
Merthyr Tydvyl to Brecon
Quainton Road to Leicester via Rugby
Skelmersdale to Somewhere
St Austell to Goonbarrow
Stanley to Forfar
Swindon to Cricklade (actually part of M&SWJ)
Thornbury to Yate
Walsall to Stourbridge via Dudley Port
And we're probably between us approaching the 5,000 miles - that's 100 lines of 50 miles average. And, yes, some of my latter list could also be extended to the junction at the far end.
My posts are "blue sky thinking" ... not what I expect to see, not a campaign base, but looking to work out what 5,000 more miles might mean. I wasn't clear from the article if it was looking at re-opened route miles or track mies on re-opened routes, but as most would be single track, there's only going to be 10% difference.