please empty your brain below

How about District/Circle?Waterloo & City interchange in the vicinity of Blackfriars?
Since you've included the Overground, I'm going to follow suit: Overground (Gospel Oak-Barking) to Northern Line at Tufnell Park. There's even a handy former station on the GOBLIN...
Oh, forgot to add: the HS2 project includes plans to integrate Euston Square and Euston stations.
Still on Overground - Piccadilly in the vicinity of Harringay Green Lanes (an annoying gap on the Piccadilly which leads to crowds boarding bus 29 at Manor House, and poor orbital connectivity)
North Acton and the Overground just passing above the tracks.
There are loads of missed opportunities but many are in the realms of "la la" land in terms in likelihood. DG has listed many of them but here are two more.

District / Picc to Overground near the old Chiswick Works.
Central to Overground at Leyton.

There are, of course, plenty of possibilities for new stations on the wider rail network but that falls outside of Tube Week's scope.
Further to Iain's comment, the Waterloo & City Line passes very close to Blackfriars (see map). Apparently, there have been serious considerations about putting an intermediate stop on the Waterloo & City there as an interchange with the District & Circle Lines.
Can i throw West Hampstead into the mix? Isn't there some sort of serious consideration of having a walkway that connects up two of the the three stations so that you don't have to touch-off, walk down the road, then touch-in again?
Central/Picadilly in Ealing, with the only option being to go via Ealing Broadway and the District Line, or walk from West Acton to North Ealing. A station where they cross could also serve the Great Western Main Line.

The W&C at Blackfriars suffers from the same problem as the Central at Shoreditch - unless you provide longer trains (which means rebuilding both existing stations) there is simply no room.

It seems that Crossrail will not interchange with either the Piccadilly or Victoria lines, despite crossing them both in central London. Likewise Crossrail 2 is planned to run direct from Victoria to Picadilly Circus, crossing the Jubilee Line without interchange somewhere near St James Palace.
Walthamstow Central / Queens Rd Overground: due to concerns about "privacy" (or maybe just trying to welch on a deal) has been awaiting a connecting walkway for many years.
It's not an example of two lines crossing and it's concerned with NR not just the tube but for me the most annoying missed opportunity is the way the end of the Northern Line runs within metres of the line between Sutton and Wimbledon with no connection.

As for DG's original list the only one that really should have been built by now is Euston Square. If and when HS2 arrives and a connection is finally built it will only have taken the best part of 2 Centuries to connect Euston to the circle line.
Where does Thameslink cross the Central Line? Somewhere in the vicinity of City Thameslink, perhaps? Admittedly Crossrail will be great at Farringdon, but an opportunity was missed in the 1990 when the cross-London line reopened.










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