On Sun, 11 Jun 2006 17:07:09 +0100, Tim Roll-Pickering wrote:

The CX & Embankment Northern Line stations must be very close to each
other.

Not as close as some (e.g. Covent Garden & Leicester Square).

IIRC, CX and Embankment (Northern) are actually slightly closer
together, as the crow flies, than Leicester Square and Covent Garden,
but due to the curvature of the track, the distance by rail is
slightly longer.

(Or was it the other way round?)