please empty your brain below

Trains do sometimes reverse at Twickenham. If there is engineering work affecting the Barnes area,
trains on the Windsor Line and the Reading line which arrive under the Kingston loop flyover, reverse and head to Waterloo via Kingston/Wimbledon.
This only happens if the Barnes Junction is closed, if there is work on the track between Twickenham and Mortlake the trains to/from Windsor or Reading go via the Hounslow loop.
In the 1980s, there was a suggestion for a ten-minute interval service from Clapham Junction to Lewisham via Peckham Rye. With an interchange at Brockley, this might have made a bit more sense than the current Overground arrangement. Of course Lewisham Junction would be a terrible bottleneck, but sooner or later it is going to have to be fixed.
Wouldn't be much use to me
At Wimbledon, there's a "plan" to build an extra platform for Tramlink - the Wimbledon terminus is a huge bottleneck and is stopping them from improving the service.

So they're going to build more space for Tramlink at Wimbledon in the next few years. Although they haven't announced how - they obviously can't take over the Thameslink platform, and there's no space on the other side.

However outside the station, to the south, is a cripple siding and enough space for two platforms. My guess is they'll move Tramlink out there - makes it some distance from the rest of the station which could be awkward, however it has room. And if they do that, they could free up the current Tramlink platform and return it to Thameslink usage.

The far end of the Tramlink platform is also an unused bay platform for Thameslink services so they'd just need to restore the track south of the station.

So anyway, that should sort out the Wimbledon problem.
A bit disappoiuted you mentioned the "Mayor's London infrastructure plan 2050" and not my lovely map of it for London Reconnections.

It's here London 2050 - a Tube Map for the Future

You might have seen this as it got featured on the BBC London News, as well as Time out and The Londonist.
Whilst I remember, one of the things I did on the map was specifically for Diamond Geezer.

The text size and yellow highlights for the "destination" and "gateway" stations was done because DG pointed out how hard it was to spot the popular station in the central area these days.
@ Andrew Bowden - the extra tramlink platform should be built early next year. It will be a staggered arrangement similar to platforms 1 and 2 for Overground services at Clapham Junction. The closures for the work are shown on the TfL closures look ahead document - the work is scheduled for Jan to early April 2015.
PC - Really? Wouldn't have expected there would be anywhere near enough room for that to happen. Shame that they won't be releasing capacity for Thameslink them!
Normally trains from Lewisham to Victoria *do* use the set of tracks you mentioned, so you don't need to make the down-and-under change. The trains usually go via Bexleyheath and end up at the same Lewisham platforms as the trains via Abbey Wood, but at the moment they're going via Sidcup and so have to use the other platforms. The reason for the change: those set of tracks broke at the start of October and its taken them a whole month to get replacements. See this article, for example.
Andrew Bowden: work on the new Tramlink platform at Wimbledon is well under way: and the new platform will be built beyond the existing one (like at Clapham Junctoin platforms 1 and 2). This will take up much of the old bay platform for Thameslink, whose track was removed some months ago.

On the subject of Clapham Junction, I can't see any proposed circuit omitting Twickenham - more likely it would become the start/finish point of the circuit, like CJ is for the Overground.

You would not normally have to change platforms at Lewisham, but the complex of points outside Lewisham was damaged earlier this month and only certain movements were possible until a replacement could be fabricated. Consequently the Victoria services were running off the Sidcup line instead of the Bexleyheath line. I gather it was fixed over the weekend.

There are no regular services from Woolwich to Peckham. Even at the best of times Woolwich-Lewisham only operates off-peak (at other times you have to use the DLR between Greenwich and Lewisham).
There are a handful of direct trains between Peckham Rye and Wimbledon.
@Andrew Bowden/PC
As I understand it, both new platforms will be further from the bridge than the present one is, allowing room to take a bite out of the old platform to fit in a double-track approach. No doubt all will be revealed after the shutdown in scehduled for January.
It is theoretically possible to do the trip (via Richmond rather than Hounslow, to avoid the non-passenger link between Kew Bridge and South Acton) in 3h36 with six changes. This should work once an hour, off-peak.

Abbey Wood 1138
Lewisham 1155 1208
Peckham Rye 1215 1220
Tulse Hill 1228 1231
Wimbledon 1246 1313
Richmond 1348 1358
Gospel Oak 1430 1435
Barking 1514


In the reverse direction also in 3h 36, but withy only five changes - but this only works once a day, as it relies on extra peak-hour services on the Kingston and Wimbledon Loops

Barking 1548
Gospel Oak 1627 1637
Richmond 1714 1733
Wimbledon 1811 1821
Peckham Rye 1843 1851
Lewisham 1902 1907
Abbey Wood 1924

Is it just me (probably) thinking that if said plan extends as far west as it does that "logic" would say it should at least propose having Heathrow in the loop?
When you change trains at stations like Wimbledon or Clapham Junction, it is stronly advised to check the departure on your smartphone about 3 minutes before you arrive, so you know which platform to look for when you get off!
Did it myself in the 1980s - NLL Stratford to North Woolwich,Woolwich Arsenal to London Bridge, SLL London Bridge to Battersea Park, Queens Road Battersea to Richmond, NLL Richmond to Willesden Junction, DC Line to Watford Junction, Watford Junction to St Albans Abbey, St Albans to Farringdon.
"Unknown Haydons Road"
Known by me though. At one time I used it every weekday.
Also maybe worth noting that Wimbledon to Twickenham is also often faster via Clapham Junction.
Best time from Wimbledon to Twickenham via CJ according to NR's planner is 30 minutes, compared with 29 minutes via Kingston, but it's much more frequent and in practice you will often need less than the ten minutes allowed for connection










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