On Wed, 09 Jun 2010 11:15:20 +0100, Ivor The Engine
wrote:

On Tue, 8 Jun 2010 13:50:52 -0700 (PDT), E27002
wrote:

My initial reaction to the London Overground corporate brand was that
it is unneeded. The converted lines could simply have functioned
under the "Underground" identity.

Not necessarily. "Underground" (when associated with particular
designs etc.) is a brand used to indicate London Underground Ltd and
using it for non-LU services could at the least cause confusion or at
worst invite legalistic cock-ups.

But it would still need a 'line' brand within the Underground
identity. The parts of Overground actually below ground are relativly
few so it's a good description of the service.