On Wed, Jul 20, 2011 at 07:56:26PM +0100, Paul Corfield wrote:

I'm not sure that Overground is being marketed as an almost tube line
in terms of frequencies.

Maybe not in terms of frequencies, but it is marketed as being a tube
line. Consider the announcements at stations that these days often end
"there is a good service on all other underground lines, including the
DLR and London Overground".

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