In article . com, MIG
writes
Victoria Line and City branch of the Northern Line do have cross-platform
interchange at Euston.
[...]
They probably did it that one on the assumption that someone was more
likely to want to change northbound - northbound (eg Green Park to
Tufnell Park) or southbound - southbound (eg Highbury to Angel
[dubious]).

Before the Victoria Line was built, the CX branch saw a *lot* more
traffic than the Bank branch, because of people from the north
travelling to the West End (the City wasn't such a big attractor of
commuters back then). Therefore the easy interchange to the Victoria
Line was put on the Bank branch to even out the flows, and the Warren
Street interchange on the CX branch is deliberately less convenient (it
nearly got omitted entirely).

The layout of the interchange is presumably the reason why the
Victoria Line runs "wrong way" from Warren Street to Kings Cross
(inclusive).

Correct. There wasn't room to fix it any closer.

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