On Wed, 07 Nov 2007 01:17:56 +0000, James Farrar wrote:

Quoted from: http://en.wikipedia.org/wiki/Overground_Network

This link led me to [[London Overground]], which makes an interesting
point:

"When the [East London Railway] extension opens, the London Overground
will [...] be below the London Underground part of Whitechapel tube
station" (!)

That will be the case from Sunday at Stratford, where the NLL
platforms are below the Central Line platforms.

(Also just to the west of West Hampstead, where the NLL passes under
the Met and Jubilee, etc.)