Metropolitan Line Extension ('MLX'), formerly the 'Croxley Rail Link'

Three Rivers District Council supports the Metropolitan Line Extension (formerly the Croxley Rail Link), which is the proposed extension of the London Underground Metropolitan line, from Croxley Station to Watford Junction.

The scheme is being promoted by London Underground in partnership with Hertfordshire County Council and Network Rail. Three Rivers District Council and Watford Borough Council are also committed to the delivery of this important project as it will clearly benefit local communities by:

  • Improving access to public transport for local residents (more than 2,500 households would be within 10 minutes walk of the two new stations)
  • Creating better connections between Watford and Croxley Green, with new routes to Watford General Hospital, Croxley Green Business Park and other Industrial Estates, which will increase access to employment opportunities for local people
  • Providing access for Metropolitan line passengers to West Coast mainline National Rail links from Watford Junction station

This scheme will involve a significant level of construction work. A more detailed works programme is currently being compiled by the project team and will be published once detailed engineering designs are completed. 

London Underground explains that: "the Metropolitan Line Extension will greatly enhance the rail network for those living, working and visiting the area. It will support growth and regeneration in the Watford area by creating new links to Watford General Hospital and the new health campus, Croxley Business Park and Cardiff Road Industrial Estate.

Two new stations will be created at Cassiobridge and Watford Vicarage Road, served by new walk-through air-conditioned trains every ten minutes to and from central London during peak hours. The existing Watford Metropolitan station will close to the public following the opening of the new stations, but will be retained for operational purposes.

Enabling work, including ecological and environmental protection work, is already being undertaken for the project. It is anticipated that construction of the extension could commence from 2016, with a target to complete the transformative link in late 2020". 

If you have any questions about the scheme, please refer to London Underground using the following contact details: 

Phone: 0343 222 2424 (24 hours)
Post: London Underground Community Relations, 5th floor, Palestra, 197 Blackfriars Road London SE1 8NJ

If you are interested in the work that Three Rivers District Council does to support the scheme, please contact the Economic & Sustainable Development team at 01923 776611 or email