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

Passengers are advised to plan ahead for major work on the Arun Valley Line in summer. Network Rail engineers will be rebuilding a crucial section of West Sussex’s railway, including a nine-day period in August when there will be no trains at all through Horsham, plus five weekends of engineering closures in July, September and October.

From Saturday 14 to Sunday 22 August 2021, buses will replace trains 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.

Additionally, there will three weekends of engineering closures ahead of the main work and these will take place on Sunday 11 July, Saturday 17 to Sunday 18 July, Saturday 31 July to Sunday 1 August 2021. Following the main closure, there will be a further two weekend closures on Saturday 4 September to Sunday 5 September and Sunday 3 October.

Network Rail engineers will use the time to invest £8.5m to replace 1980s track and infrastructure, with new, more reliable equipment.

Arun Valley Line improvement project survey

We are asking passengers to take a few minutes to complete this short survey on the renewal project and line closure on the Arun Valley Line.

Your participation in this survey will help inform us on how we communicate with you about this project, so we can best keep you advised on the work taking place and any further projects. All responses provided will be used only for the Arun Valley Line improvement project and in accordance with our privacy policy. Thank you for completing our survey.

What the work will involve and where

Work includes:

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 connectivity benefits of the project.

Key dates

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

Map of key affected routes

Passenger disruption

The work requires all lines via Horsham to be closed. Crawley station will remain open on weekdays during the nine-day period but closed on all affected weekends.

Services on longer distance coastal journeys to Chichester, Littlehampton, Bognor Regis and Portsmouth will still be running, but will go via an alternative route using the Brighton Main Line, meaning journeys will take longer.

The closures have been planned for summer, when some people may be more flexible with their travel plans. We’ll ensure that alternative routes are fully open on these dates, and we’ve timed the work to avoid Brighton Pride.

Passengers wishing to travel along the Arun Valley line 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 and will confirm detailed travel arrangements next year.

Sign up for email updates

Sign-up with your email address to receive updates on the line closures affecting all train services via Horsham and the Arun Valley Line, 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.