Read this: Transport is one of the four main areas of policy administered by the Mayor of London, however the mayor's financial control does not extend to the longer distance rail network that enters London. In 2007 he assumed responsibility for some local lines, which now form the London Overground network, adding to the existing responsibility for the London Underground, trams and buses. The public transport network is administered by Transport for London (TfL) and is one of the most extensive in the world.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): Along with the London Underground, buses and trans, what form of public rail transport was added in 2007 to the Mayor's responsibilities?
the London Overground network