On 20.02.10 12:01, Roy Badami wrote:
Subject says it all. Is London Overground part of the National Rail,
network, or not?

The observation that triggered the question was seeing, on one of the
maps on board a tube train, a station showing an interchange opportunity
with London Overground, but *not* showing the National Rail symbol
against the station name. Which would seem to imply not.

-roy
It is part of National Rail, but TfL has the franchise for whatever
number of years.