London mayor Sadiq Khan has added a possible orbital rail line for West London and a proposal for the Sutton Tram extension to an updated 25-year transport strategy for the capital.

The mayor’s office said the strategy will ‘ensure affordable public transport for all, support London’s economic growth, and create a fairer, greener and healthier city.’

It said the strategy includes ‘record investment’ in new and improved rail, tube and bus services, an ‘unprecedented focus on walking and cycling’ and a commitment to make the entire transport system zero-emission by 2050.

The strategy now includes the potential for a West London orbital rail line, connecting Hounslow with Cricklewood and Hendon via Old Oak, Neasden and Brent Cross. This new line would be delivered through TfL, the West London Alliance, boroughs and Network Rail.

The strategy also contains a specific proposal to work with the London Boroughs of Merton and Sutton to develop the proposed Sutton Tram extension.

Khan said: “I’ve been clear that we need to be bold in how our city operates as London’s population grows, and this means not only investing record amounts in new infrastructure like extensions to the tube, rail and Crossrail 2, but working with boroughs and local communities to reduce our reliance on car use across London.”