Rail passengers across southern England are being told to prepare for a difficult day of travel after a fault affecting railway radio communications caused widespread disruption, cancellations and delays of up to 90 minutes across several major train operators.
The problem has hit one of the countryâs busiest rail corridors, with services to and from London Waterloo among the worst affected. South Western Railway said disruption was being felt across its entire network, while National Rail warned that major disruption was expected to continue until the end of the day.
The issue is linked to the communication system used by train drivers and signallers. This system is essential because it allows drivers to receive movement instructions and safety information from signalling teams. When that link is affected, services cannot run at normal speed or frequency, meaning trains may be held at stations, delayed en route, revised, or cancelled at short notice.
National Rail said the disruption was caused by âa fault with the radio system between the driver and the signallerâ. Passengers were warned that some services could be delayed by up to 90 minutes, while others may not run at all.
The disruption has affected seven operators across southern England:
- CrossCountry
- Gatwick Express
- Great Western Railway
- London Overground
- Southern
- South Western Railway
- Thameslink
South Western Railway said its operations and engineering teams were working with signallers to identify and fix the fault. The company said there was no confirmed time for when normal signalling communications would resume.
âTrains are operating under signaller instructions while teams investigate,â SWR said in its passenger guidance. That means services can continue moving, but with extra caution and reduced capacity across the network.
London Waterloo has become a major pressure point during the disruption. The station is a key gateway for commuters travelling between London and towns across Surrey, Hampshire, Dorset, Wiltshire and beyond. When services at Waterloo are reduced or revised, the impact can quickly spread to connecting routes and regional stations.
Passengers have been advised to allow extra time, check live departure boards before travelling, and avoid relying on normal timetables. Platform information may also change at short notice as operators try to manage train movements around the fault.
The disruption is particularly challenging for people travelling to work, airport passengers heading towards Gatwick, and those using long-distance connections through stations such as Basingstoke, Salisbury, Southampton, Exeter and Reading.
To reduce pressure on the network, South Western Railway tickets are being accepted on alternative routes at no extra cost. Passengers have been told they can use Great Western Railway, Southern and CrossCountry services by any reasonable route.
London Underground and Transport for London services are also being used as alternatives for some passengers. SWR said ticket acceptance includes the Piccadilly line between Hounslow West and Green Park, the Jubilee line between Green Park and London Waterloo, and the District line from Wimbledon, Richmond or East Putney to Embankment, where passengers can connect with the Bakerloo or Northern line to Waterloo.
Transport for London buses are also available by reasonable routes between Zones 1 and 6 for affected passengers.
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Free buses have also been arranged in several areas where rail services are severely disrupted. In Basingstoke, Stagecoach route 76 is available between Basingstoke, Overton, Whitchurch and Andover. In Salisbury, passengers can use Salisbury Reds route 26 between Salisbury and Tisbury, route X7R between Salisbury, Romsey, Totton, Millbrook and Southampton Central, and route 37 between Salisbury and Dean.
In Exeter, several Stagecoach routes are accepting passengers, including services between Exeter Central, Exeter St Davids, Pinhoe, Cranbrook, Honiton and Axminster.
Rail passengers who choose alternative transport have been advised to keep their original tickets and receipts for reasonable additional costs. Refunds or compensation may be available depending on the operator and the length of delay.
Passengers can check official updates through National Rail, which is providing live information on delays, cancellations and ticket acceptance. South Western Railway is also publishing route-specific updates through its official disruption page.
The fault highlights how dependent modern rail services are on communication systems that connect drivers, signallers and control rooms. Even when tracks and trains are physically available, a failure in communication equipment can force operators to reduce service levels for safety reasons.
For readers following wider UK transport and public-service disruption, more updates can be found on Swikblog, where major travel, business and breaking news stories are covered as they develop.
While engineers continue to work on the fault, passengers across southern England should expect disruption to continue through the evening peak. Those with flexible plans are being urged to delay travel where possible, while commuters already on the move should check their route repeatedly before boarding.
With Waterloo, Gatwick Express, Thameslink, Southern and other operators affected at the same time, the disruption is likely to remain a major travel issue until the radio communication system is fully restored and delayed trains, crews and platforms are brought back into normal order.
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