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27 Oct 2025

Bringing track and train together: innovative on-board camera programme expanded to spot issues before they cause delays

Bringing track and train together: innovative on-board camera programme expanded to spot issues before they cause delays: Train borne camera - thermal imaging

  • Major investment by the integrated South Eastern Railway to fit on-board monitoring cameras onto 32 trains.
  • Data from the cameras provide early warning of potential faults and hazards on the railway so they can be fixed before causing delays.
  • Initial pilot programme identified 41 overheating incidents and prevented over 9,000 minutes of delays for customers.

A pioneering programme that has turned passenger trains into mobile inspection platforms is to be expanded to more routes and trains across South-East London, Kent and parts of East Sussex.

The South Eastern Railway, which brings together the passenger operator Southeastern and the infrastructure provider Network Rail Kent Route, are working together to find new ways of improving performance across the network.

Earlier this year, a pilot programme installed thermal imaging cameras on the front of a small number of Class 707 ‘City Beam’ trains. They successfully spotted 41 overheating incidents and prevented over 9,000 minutes of delays for customers.

The technology is provided by AIVR tech company One Big Circle and is now being expanded to include 20 Class 375 ‘Electrostar’ Main Line trains alongside the 12 Class 707 ‘City Beam’ trains already fitted. Other UK train operators have used similar technology but South Eastern Railway is the first to permanently install on-board cameras on this scale.

This means Metro services, principally serving South-East London as well as longer distance Main Line services will now be covered, allowing even more of the network to be monitored and helping to spot more issues before they can cause delays.

The train-borne AI-monitoring cameras are an advance in railway maintenance technology that is safer, more efficient and helps to reduce delays.

The thermal imaging cameras can identify ‘hot spots’ on the rail network and relay this information rapidly to asset engineers. They can then review the data and make an informed decision as to whether the issue needs repairs, which helps to resolve issues before they can cause disruption to customer journeys. 

The technology can also assess the condition of the railway to determine what equipment is required for repairs and the staff needed to carry out the work, without the need for physical visits to the location. This is more efficient and safer.

Watch the short YouTube explainer video here:

Rail Minister Lord Peter Hendy said:

“This Government is fundamentally reforming how our railways are run, creating a network that works better for the people and freight using it.

"The cutting-edge technology South Eastern Railway is installing on its trains is key to achieving this and should serve as an example of the kind of smart investments we’re making as publicly owned rail companies work to improve services."

"These upgrades will prevent disruption and reduce delays, supporting local jobs, growth, and housing as part of the Government’s plan deliver an efficient and reliable railway."

Dan Paris, South Eastern Railway’s Fleet Maintenance Director, said:

“Our integrated railway is using train-borne cameras to provide the early warnings we need to identify and fix problems before they cause disruption for our customers.

“The cameras on the City Beams are monitoring our London Metro routes and now with a new set of cameras being added to 20 of our Class 375 trains we can look out for any issues on a much wider area across East Sussex and Kent. I’m confident that they will really help us in our drive to improve performance and reduce delays.”

Emily Kent, Director of One Big Circle, said:

"It's been fantastic to work with South Eastern Railway to deliver this cutting-edge technology onboard the fleet. The can-do spirit and collaboration of all involved has ensured faster, more effective outcomes that will bring real benefits to passengers and staff across the network." 

Five of the 20 Class 375 trains in the programme will also be fitted with cameras underneath the body of the train. These cameras will monitor how slippery the track is as well as the condition of the ‘shoe’ and the conductor rail, which transfer the electricity to power the train. Assessments from these cameras will support further performance improvements, particularly during periods of difficult weather.

ENDS

Contact information

David Meechan

External Communications Manager

david.meechan@southeasternrailway.co.uk

Notes to editors

South Eastern Railway jointly manages 540 miles of track across Kent, East Sussex and South-East London, providing nearly 1,700 train services and up to 500,000 customer journeys per day. 

Network Rail carry out inspections of the route all year round (with trains, helicopters and handheld thermal imaging systems) with the aim of spotting issues before they impact services or need more substantial fixes. In addition, Southeastern drivers can also report potential issues, such as a rough ride or overhanging vegetation.

The effectiveness of this approach is limited by the number of trains available, the size of area that can be covered and the speed in which potential faults can be reported and actioned. 

Improving insight and data collection from train borne cameras offers a number of effective interventions.

About South Eastern Railway

South Eastern Railway was formally stood up on 18th June 2025 and brings the publicly owned train operator, Southeastern and infrastructure provider, Network Rail Kent Route, under a single leadership team.

This integrated approach to managing the railway in South-East London, Kent and parts of East Sussex aims to drive investment and efficiency and deliver for passengers and freight in an important step towards the eventual creation of Great British Railways (GBR).

South Eastern Railway is a contractual arrangement between Southeastern and Network Rail. No accountabilities have been transferred, and each organisation will remain responsible for decision-making for its respective accountabilities. There are no changes to any staff Terms & Conditions.

About One Big Circle

One Big Circle is a Bristol-based company pioneering intelligent video solutions for the railway industry, from critical data capture through to machine-powered analysis. The AIVR Platform delivers comprehensive infrastructure monitoring through innovative camera systems, machine learning, and cloud-based management. One Big Circle works with Network Rail, train operating companies, and partners across the railway supply chain to transform traditional inspection processes, enhancing safety and efficiency whilst reducing trackside working."

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