Nine day closure affecting all trains via Horsham from Saturday 14 August to Sunday 22 August 2021 (inclusive)

From Saturday 14 to Sunday 22 August 2021 inclusive, plus several weekends between July 2021 and October 2021, no trains will run along much of the Arun Valley Line, from Arundel to Three Bridges including Horsham and Crawley, and the Mole Valley Line between Horsham and Dorking.

Network Rail engineers will use the time to invest £8.5m to replace 1980s track and infrastructure, with new, more reliable equipment. Passengers are advised to plan ahead for this major work in 2021.

What the work will involve and where

Work includes:

  • The work over the blockade in August 2021 will help improve service reliability and safety, while minimising disruption to passengers.
  • A section of rail, sleepers and ballast will be renewed at Horsham station, and track drainage improved to help reduce or prevent the risk of flooding on the line. The upgraded track will give passengers smoother, more reliable journeys and maintain track quality for the long-term.
  • Enabling work for the upgrade of Parsonage Road level crossing to a full barrier CCTV crossing to improve safety, and re-control of Littlehaven signal box to the Three Bridges Rail Operating Centre (ROC) in March 2022. 
  • To give passengers additional benefits Network Rail and train operators are looking at options to refurbish stations when they are closed.

The benefits

Better, more reliable journeys

Arun Valley services are amongst the worst performing in the region, experiencing more delay than the average train service in the area. These essential renewals and upgrades to the Arun Valley Line infrastructure will help modernise the network, allow for future passenger growth, and improve passenger journeys.

Reduced risk of flooding on the line

Drainage improvements will also help reduce or prevent the risk of flooding on the line.

Less overall disruption to passengers and the benefits delivered sooner

This investment was originally planned for several bank holiday closures, supported by a long series of weekend possessions over two to three years. By doing the work over nine consecutive days and two weekends, the overall disruption to passengers can be significantly reduced, while fast-tracking the delivery of the reliability, safety and capacity benefits of the project. 

Key dates

  • Enabling work: Sunday 11 July 2021, Saturday 17 – Sunday 18 July and Saturday 31 July – Sunday 1 August 2021
  • Nine-day closure: Saturday 14 August 2021 – Sunday 22 August 2021 (inclusive)
  • Follow-up work: Saturday 4 September – Sunday 5 September 2021 and Sunday 3 October 2021

Map of key affected routes

Click the image to download PDF of affected routes

Passenger disruption

The work requires all lines via Horsham to be closed meaning that there will be some disruption. The closures have been carefully planned for the summer holidays, when passenger numbers are lower, and some people may be able to be more flexible with their travel plans or take holiday. The work has been timed to avoid disrupting Brighton Pride 2021 at the start of August.

Passengers wishing to travel on these dates will need to allow considerably more time for their journeys and should expect to use either diverted trains via longer routes or a replacement bus or coach to connect with rail services.

We are working to ensure people have as many alternative options as possible over the closures. Southern and Thameslink's timetables for the closures will be made available around June 2021.

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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.