London Mayor Sadiq Khan has previously said that he has been lobbying the Government to securing funding for a proposed West London Orbital Overground line.
If built, trains would run from West Hampstead and Hendon towards Hounslow.
Here is everything you need to know about what might soon be the newest line on the TfL network.
Where would the route go?
The West London Orbital (WLO) would see passenger services introduced on existing freight rail lines that run from West Hampstead and Hendon towards Hounslow.
The final route is yet to be revealed, but current plans would see trains call at 15 stations in total.
Existing platforms will be used in some instances, but new stations would be required at Neasden, Harlesden, Old Oak Common and Lionel Road.
The other stations where trains could stop are Cricklewood, Brent Cross West, Acton Central, South Acton, Kew Bridge, Brentford, Syon Lane and Isleworth.
Why is the route needed?
Last November, London Mayor Sadiq Khan said that although he was lobbying the Government for funding for the route, it was “not definite” it would ever be built.
But he said that the new line would “enable more homes, more jobs and growth”. Up to 15,800 new homes could be built across the route.
Mr Khan has also said: “The WLO would connect underprivileged areas like Harlesden and Neasden to key employment areas, encouraging mode shift from private cars resulting in carbon and air quality benefits, and reducing crowding on radial corridors by avoiding the need for travel via central London.”
How often would trains come?
A recent TfL report sets out plans for six Overground trains an hour between Hendon and Hounslow. It does not reveal how many services are planned from West Hampstead.
Four of these trains would travel the full length of the line, with a further two services between Hendon and a new station called Old Oak Common Lane.
If built, the new station would allow passengers to interchange with HS2 services at Old Oak Common.
Mildmay line services could also call at the new Overground station, TfL says.
When will trains start running?
Design work is expected to be completed by next summer, which would pave the way for an application to start work on the new line in 2028.
Using 2023 prices, the current cost of the scheme, which could open in 2034, is £800 million.
Funding discussions with London boroughs and the Government are ongoing, with a consultation on the plans expected at the end of the year.
