Caterham & Tattenham Corner were firm choices, it was more than just Windmill Junction that these routes were dropped however, both lines have very short platforms and the class 700's don't have selective door operation.
Once again, Tattenham Corner was only a very sketchy project (it was in doubt years ago, when I was a lowly member of staff dispatched to provide promotional info to passengers affected by the TLP blockades!).
Also, I really don’t think any manufacturer would get away with providing an 8 or 12 coach fixed-formation unit to the UK rolling stock market if it didn’t have full SDO. 700s can do SDO not just per-coach but also per-door, or essentially half-coach - which has proved very useful on at least a couple of occasions!
I agree that it would've been best to have the Rainham service replace the Victoria to Gillingham service, and leave the Greenwich/Woolwich line as it, all you've done is by avoiding issues at Windmill Junction, you've pure them upon North Kent Junction right near London Bridge, what was the point in ironing out the lines east of London Bridge if your going great new conflicts with this Greenwich Thameslink service.
Windmill Bridge Junction (note correct name) is only a small part of the problem; in fact, Windmill Bridge itself is intensely busy but quite docile compared to the effects of conflicts at the surrounding junctions at Cottage Bridge, Norwood Fork, Norwood South/North, Selhurst, Gloucester Road etc.
The ripples of these spread far and wide. Once you’ve established enough breathing space, which will be provided in May perhaps for the first time in living memory, you’ve run out of room for sustainably holding that extra service group, which has to go somewhere, as it can’t exactly just stop at London Bridge or the Elephant! I also see room for some experimental stuff, as I understand the Kent side is the one with some redundancy in crossovers (perhaps perverse considering just how busy most of the rest is) which could allow the timetable to be chopped and changed onto a different route, if the current proposal proves unacceptable.
I believe the lack of stops at certain stations in outer South East London / North Kent is partly to do with trying to offer a reasonably decent service to as many people as possible, without getting hammered for deliberately eating into mandatory turnaround times and pathing requirements.
I think the fact that Crossrail will interchange with the Woolwich line at Abbey Wood has a small thing to do with this last minute service.
It will certainly have its uses as an interchange, but don’t forget the main planning has really gone into Farringdon, which will be a far more useful interchange for a lot more routes.
The 700s do have selective door operation. On the GN route, Meldreth in both directions and southbound at Shepreth and Foxton have 4 coach platforms but the 8 coach units will call there using SDO. The 12 coach units operating the semi-fast services will call at Baldock which only has 8 coach platforms.
Quite. And all trains over 5 coaches need SDO to serve the smaller stations to Horsham, plus anything over 8 needs SDO to provide a service both ways to Balcombe. Intermediate stops to East Grinstead and Littlehampton need SDO. Etc...
Main issue at Caterhamand Tattenham Corner is the fact that both terminals are restricted to 8-car length, so you can't reverse a 12-car train there.
That was exactly what I wrote above!
Tattenham Corner could actually possibly have a modest platform extension - where there’s a will, etc. - but good luck on the Caterham branch.
Oh, and one of the Whyteleafe stations has an adjacent level crossing too, I think?
Both. However, TL will be stopping long trains over level crossings here and there (Littlehaven, mainly) so that one is clearly not a deal-breaker.