The 18.5km West London Orbital would include four new stations, with up to six trains an hour running on part of the route.
A new London Overground route could link Hendon and Hounslow under plans being put to the public for the first time by Transport for London.
The proposed West London Orbital would run for around 18.5km through west and north-west London, using existing railway infrastructure including the Dudding Hill line, which is currently used by freight trains.
Four new stations are proposed at Neasden, Harlesden, Old Oak Common Lane and Lionel Road, near Brentford.
The route would also serve Brent Cross West, Acton Central, South Acton, Brentford, Syon Lane and Isleworth before reaching Hounslow.
Image: TfL
TfL is proposing four trains an hour between Hendon and Hounslow, with an additional two trains an hour running between Hendon and Old Oak Common Lane.
The new route would provide connections with the London Underground, Elizabeth line, National Rail and other London Overground services, as well as the future HS2 station at Old Oak Common.
At Harlesden, passengers would be able to interchange with the Bakerloo line and London Overground’s Lioness line, while the proposed Neasden station would connect with the Jubilee line.
TfL says the scheme could support around 25,000 new homes and 11,500 jobs across west and north-west London.
It also estimates the route could generate up to £1.3 billion in wider economic benefits and remove around 650,000 car journeys from London’s roads each year.
David Rowe, TfL’s Director of Investment Planning, said: “This consultation is an important opportunity for people to shape the future of this new London Overground route.
“By making better use of existing rail infrastructure, we can improve connections between communities and support growth across west and northwest London.”
Up to £6.65 million has been agreed by TfL and its partners to continue design work, modelling and consultation on the scheme.
Subject to progress on funding, TfL expects to decide at the end of 2027 whether to seek the legal powers needed to build the railway.
If funding and approvals are secured, construction could begin in the early 2030s, with services potentially starting by 2035.
The West London Orbital has not yet been approved for construction and would require further funding before work could begin.
TfL’s consultation opened on 23 September and runs until 18 November.
