Disruption to Southern services between Southampton Central and Fareham expected until 11:15 

Route(s) affected

Between Southampton Central and Brighton

Description

A fault with the signalling system in the Netley area means that some lines are disrupted. As a result, Southern trains running between Southampton Central and Fareham may be delayed by up to 15 minutes or revised.

Disruption is expected until 11:15.

Customer advice:

If you are travelling between Southampton Central and Fareham you can travel on your normal route, but you will need to allow at least an additional 10 minutes to complete your journey.

Please talk to station staff, look at the information boards or check your journey planner for the most recent information.

Planning your journey:

You can use live departure boards, a live map of the network and the alternative route guide to help you.

If you're travelling in the London area, you can plan journeys on alternative routes by using the TfL Journey Planner.

Can you tell me more about the incident?

A track circuit failure will disrupt your journey in the Netley area.

This part of the network uses track circuits to detect the position of trains. These are electrical systems which monitor whether a train is on a section of track. They operate as part of the signalling system, which is designed to be "fail safe".

When a track circuit fails, the signalling system will interpret this as a train remaining in place, even though there may not be a train present at all, or the previous service may have long since left the area.

As a result, further trains cannot be automatically allowed onto the relevant section of track. Train drivers will be stopped by red signals on approach. They will then get verbal permission from the signaller so that they can proceed, and will run at a heavily-reduced speed as far as the next signal. This is so that the drivers will stop safely if they see anything ahead of them.

In some areas, the sections between signals can be several miles long, so this can result in delays building up. Even with shorter sections of track affected, there would still be a delay of at least a few minutes to each journey.

Track circuit faults can be caused by a number of different issues, including electronic faults or obstructions on the track. Network Rail manage the signalling system, including track circuits, and their staff will be investigating as quickly as possible.

Check before you travel:

You can check your journey using the National Rail Enquiries real-time Journey Planner.

Compensation:

You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.