Enabling works for the MLX (the Metropolitan Line Extension, formerly the Croxley Rail Link)


Transport for London is responsible for the Metropolitan Line Extension (formerly the Croxley Rail Link) and has provided the following details to the District Council:

Works to services under the ground

In order to prepare for the new viaduct over Baldwins Lane, substantial utilities work needs to take place in and around Baldwins Lane and the A412 Watford Road. This will be undertaken in phases from March 2016, as the various utility companies complete their work.

On the 28 August, TfL provided the following update to the District Council:

BT work on Tolpits Lane: Monday 24 October to Friday 4 November

BT will be undertaking work to divert some cables on a small section of Tolpits Lane, near Chessbrook Education Support and the land where a new substation will be built for the Metropolitan Line Extension. The work will take place from Monday 24 October until Friday 4 November.

There will be a requirement to break out the existing tarmac surface using pneumatic breakers which will create some noise. We will endeavour to keep this disturbance to the minimum. The team will be on site working from 08.00 to 18.00 Monday to Friday and 08.00 to 15.30 on Saturdays.

The work requires the below traffic management to be in place:

  • Continuous northern pavement closure. 

  • One lane closure on the section of Tolpits Lane from 09:30 to 16:00 daily, which will be controlled by temporary traffic lights.

Survey work on Watford Road: Monday 24 October to Saturday 29 October

We need to carry out a significant sewer diversion in Watford Road in preparation for the new viaduct. In order to plan this work, additional surveys need to take place to locate the exact location of the sewer.  This work involves digging two trial pits in the road and central reservation by the pedestrian crossing.

 This work is due to take place from Monday 24 October to Saturday 29 October, between 08:00 and 18:00.

In order to complete the work, the below traffic management will be in place:

  • Monday 24 October to Wednesday 26 October, a daily westbound lane closure of Watford Road between 9.30am and 16.00pm.

  • From Thursday 27 October, 9.30am, to Saturday 29 October, 1pm, an ongoing westbound lane closure on Watford Road.

The pavements and pedestrian crossing will remain open during this time. The work is still subject to final approvals from Hertfordshire County Council Highways.

The sewer diversion work currently taking place on Baldwins Lane is due to be completed by 22 October, ahead of the work on Watford Road.

  • Phone: 0343 222 1234 (24 hours)
  • Email:
  • Write: TfL Customer Services, 4th Floor, 14 Pier Walk, London, SE10 0ES

For more information on the Metropolitan Line Extension please visit