Best option?
Send all of the 365s (40) to South Eastern; use them to release the 465/9 fleet etc. and on other relevent routes. Can the proposed move of 319s / 377s to Southeastern.
Send the new 387s (20) and the Thameslink ones (29) to Great Western along with the 8 being built just for GW (which I understand from my time there are being made not only Dual-Voltage but also battery-powered for North Downs. One uniform fleet based at Reading and also fit the new 20 with Batteries for Marlow, Henley, Bedwyn as well as on Oxford to Banbury.
Capacity vacuum on the Great Northern fulfilled by the 700s in part but missing some extra capacity - move the Class 377/2 fleet up there (15) which makes 4 x 12 car diagrams for additionals out of King's Cross or some 8 cars.
Hold the 377/5s on Southern (23) and send the 455s to the Coastway; being sure to keep back the Trailer Coaches to send to SWT to get rid of the 508 coaches. Fit them with Crappers and let them ply their trade as a uniform fleet based at Lover's Walk to Portsmouth, Southampton, Ore, Seaford, Littlehampton, West Worthing. If needs be, provide some surplus to SWT for use as 3+3+4 on Metro.
Take into account the 700s then covering off routes like London Bridge to Horsham (Thameslink) and extras to places like Grinstead, Eastbourne and Littlehampton and in theory all of the 377s (including /3s partnered with a 4 car for 10 Car Metro with a new suburban layout etc.) currently on Southern and the /5s is suitable.
Send Class 317s to GA and give every single on the "Blitz" of modernisation; put the Class 321s from GN up to West Yorkshire to work alongside the others (combined fleet size of 21) punch the 333s (16) across to Manchester where they could happily replace the 323s (16) for West Midlands. Use their 100mph capability for the routes down to Stoke and Crewe to get better paths and take advantage of the extra carriage, too.
According to my maths, anyway, that means that everything matches up and the maintenance costs across the board will come down. Uniform fleet of Networkers at Slade Green, uniform fleet of Siemens stuff in Manchester which could be looked after at Ardwick as well as Longsight, uniform fleet of Thyristor Mk3 stuff in Leeds, uniform fleet on TSGN except the 377s at Hornsey (but not a major problem) and the 313s / SWT 508 coaches all go so the fleet ages come down whilst also being a bit more suitable to the punters.
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There are 5 franchises being awarded in the next 2 years where 387 (or equivalent cascaded stock might go).
Porterbrook must be pretty certain of a lot of orders
TPE - 387s make sense possible 350 cascade to West Midland?
Northern - possible 323 replacement else 319s all round
Greater Anglia - 321s being refurbed but not enough 387s to replace cl90 + Mk3s and sone 321s ex TSGN
West Midlands - Have issues with 319s and more lines being electrified and some existing services could be longer but 323s and 350s best fit.
East Midlands -387s ideal for Corby servies and stops SE 375s being taken
(SWT already have 707s on order so I didn't include them)
This "Rail for London" thing was strengthened by a rumour that they might take over Hertford East and the Stratford - Bishops Stortford stopping service with the use of Drivers at Chingford and Bishops Stortford. 20 x 4 car with a delivery date similar to the Greater Anglia franchise renewal certainly makes this look a bit more realistic.
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Electrostars are 20cm taller than the current Moorgate stock, will they be able to fit though the tunnels?
Although, 319s are the same height as 313s so could 319s replace 313s with Electrostars heading for routes which either get or are expected to get 319s?
They did a test. Driver was apparently a bit shaky but a 377/5 made it.