A disused railway could be revived after more than 100 years to create a new “orbital metro” on the London Overground.
Mayor Sadiq Khan has adopted plans for a West London Orbital Rail service as part of his transport strategy for the next 25 years.
The proposals call for a revamp of the Dudding Hill line in north west London, which currently runs no scheduled passenger services.
City Hall also claimed the changes could facilitate the construction of 20,000 new homes in the area.
The mayor’s proposals read: “Most Londoners want to move around London – rather than in and out of the centre – every day and the London Overground supports this type of travel.
“London Overground train service improvements are therefore needed to support new jobs and housing throughout inner London and parts of outer London
“In recent years, areas around TfL stations have developed twice as quickly as elsewhere.
“This is because services from these stations provide higher frequencies and better connections to other parts of London.
“There is an opportunity to improve ‘orbital’ connections to Old Oak and across west London, between Hounslow and Brent Cross – Cricklewood via the Dudding Hill line.
“This new West London Orbital line could potentially support the delivery of an additional 20,000 homes, as well as employment growth in west London.”
Part of the proposed route is currently served by existing services.