please empty your brain below

this might sound radical but it's a solution that's already been tried successfully at Angel and Euston.

Not really radical, not really a case of "tried" - just implemented. A more obvious, more recent and more similar (excuse bad English) example is at London Bridge - the adjacent station on the Northern Line.
Reminds me of DG's recent observation, "Wait long enough, have faith, and London really does get better."

I hope the text on the signs isn't blue-on-white, though.
What? They're going to close the Northern Line through Bank for FOUR MONTHS in 2020? THIS IS OUTRAGEOUS. How will I get to work? I DON'T EVEN GET OFF AT BANK. They haven't even given me any notice at all of this?!

[foams at mouth gently]
Presumably the 2020 closure will affect the whole Bank branch, closing Angel and Borough stations completely.
Wait till people find out Embankment Station (Northern and Bakerloo) is closing (trains not stopping) for most of 2014.
To the poster @ 1226hrs: source or information for the Embankment Station (Northern/Bakerloo) closure?
Is that northern line closed through Bank effectively cutting through services, or that trains just won't stop at Bank?
It depends on whether the work can be done like TCR - build a protective barrier around the trains on the platform area so they can continue to run through even though the platform work is being done very close by, or not.

I don't see why it can't be done like TCR.
@Sykobee & mdb:

because connecting the new running tunnel to the old line (north and south of the station) isn't quite the same as refurbishing/updating the platforms whilst the trains run through the station.

In the old, old days when the new Picc Line tunnels were built at Finsbury Park, a step-plate junction managed to make the move happen in a much shorter timescale, but I'd expect they've given themselves a wide window to aim at now ...
I'm happy they're doing this but why oh why so miserably slowdown? 2020, really? :-(
Being slightly pedantic (and maybe wrong) but I don't think that the platforms at Angel (and maybe Euston but I'm not so sure) were 'knocked through' - rather they were originally island platforms and one of the running lines was filled in to widen the platform, as mentioned above, London Bridge is a more appropriate comparison
During the London Bridge works the southbound line terminated at Moorgate for a few months. Imagine it will be the same for this job in 2020.
Interesting to note on the plans that Arthur Street will be closed for five years for the works to take place - and that the old King William Street station of the Northern line's predecessor will be used as a works access.










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