We’re modernising the railway network with a record level of investment to improve passenger journeys across Sussex

By investing £750m to upgrade the network infrastructure and replace ageing equipment across the Sussex region with new, reliable digital signalling and train control, we’ll increase capacity, reduce delays and enhance safety.

£238m on digital signalling

£169m on tracks and junctions

£112m on replacing or refurbishing our structures

£94m on buildings

£69m on electrification and power supply improvements

£48m on earth works

£20m on drainage improvements

Key projects in 2020

  • Gatwick Airport station development – refurbishment of the station to accommodate continual passenger growth
  • Victoria resignalling phase 3 – upgrading and replacing the ageing signal and line side equipment to state-of-the-art digital signalling in the Balham and Clapham areas
  • Horsham – switches and crossings replacement and associated works
  • Haywards Heath – switches and crossings replacement and associated works
  • Selsdon Road, South Croydon – underbridge replacement

Upgrade work

The Sussex upgrade includes £169m to completely replace over 155km of tracks and junctions.

Why is this work needed?

Good track quality is essential to running a safe and reliable railway. When track becomes worn or the track bed falls away, (wet beds) speed restrictions are put place to ensure trains run safely, but this can lead to delays to journeys.

When equipment at railway junctions, points, switches and crossings, comes to the end of its operational life, more and more maintenance is needed to prevent faults and delays.

Poor track quality also affects cables and other electrical equipment causing faults and delays.

  • Horsham and Haywards Heath
  • £5m at Clapham Junction for switches and crossings replacement
  • Plain Line
    • £2.6m of rail replacement between Anerley and Norwood junction
    • £2m of rail replacement at Bletchingley Tunnel
    • £1.8m of rail replacement between Gloucester Road Junction and West Croydon

Up to March 2024 we’re investing more than £238m to replace signalling systems in Sussex and into London to give passengers better journeys with fewer delays.

Why is this work needed?

Signalling is a crucial part of the railway infrastructure, allowing trains to move safely around the network.

To protect passengers, our signalling systems are designed to fail to a safe, so faulty components can often result in signals remaining at red, causing delays.

With much of the signalling infrastructure in South London nearing the end of its operational life we need to replace it to keep passengers moving reliably.

Key projects

  • Victoria resignalling phase 3
  • Tulse Hill/Crystal palace resignalling as part of Victoria resignalling phase 4 ~£20m

We’re investing more than £94m to improve stations and buildings for passengers and our staff.

Many of the stations and railway buildings in the Sussex region date from the Victorian era and need continuous maintenance to keep them up to the standard passengers expect. Investment is also needed to modernise stations to handle rising passenger numbers and provide the facilities people travelling today expect.

Key projects

  • £2m for station platforms work at Battersea Park
  • £2m for station platforms work at Balham


The railway in the Sussex region is made up of hundreds of overbridges, underbridges, footbridges and tunnels. We’re investing £112 million to replace or refurbish several structures on the route.

Key projects

  • Selsdon Road
  • £6m for preventative and repair work outside Victoria station at Eccleston and Elizabeth Bridges
  • Various improvement work on Oxted Viaduct

Future projects

Victoria resignalling phases 4 and 5 – upgrading and replacing the ageing signal and line side equipment to state-of-the-art digital signalling in the Tulse Hill and Peckham Rye (Phase 4) and Stewarts Lane and Herne Hill (phase 5).

Keeping you moving

This record investment means that we are doing more to improve passenger journeys across Sussex and into London than ever before.  It does mean there will be some disruption, and we’ll do our best to keep this to a minimum by doing most of the work when trains are not running. We will also need to work at weekends, bank holidays and during school holiday times e.g. over Christmas/ New Year, half-term Easter.

If you are planning to travel at the weekend or during a holiday period, don’t get caught out.  Always check before you travel at National Rail Enquiries or with your train operator GTR (Govia Thameslink Railway), Southern or Thameslink.

Sign up for email updates

Sign-up with your email address to receive updates on the Sussex region upgrade and information on projects taking place across the Southern region.

Our privacy notice applies to the personal information that Network Rail collects about you, or that you provide to us. It explains how and why we use your personal information, who we disclose it to and how we protect your privacy.

Contact us

For more information or to get in touch with us, please contact us by visiting our contact us page or by calling our 24-hour national helpline on 03457 11 41 41.