Major rail disruption in South of England due to radio fault

Rail services across southern England are experiencing widespread cancellations and delays due to a fault with critical radio communications between trains and signallers [1]. Disruption is expected to continue through the end of the day. The fault, reported before 0900 on Thursday, has affected multiple operators including South Western Railway, CrossCountry, Southern Trains, Gatwick Express, the London Overground, and Thameslink [1]. Network Rail has warned that trains may be held at stations, delayed, or cancelled [1]. The radio system, known as the National Radio Network (NRN), is a vital safety and operational link for train drivers and signallers across the UK rail infrastructure. A failure in this system forces operators to implement emergency protocols, often requiring trains to proceed at reduced speeds or halt entirely until communication is restored. Similar incidents have previously caused significant network-wide delays, highlighting the system's critical role. Passengers are advised to check with their train operator for the latest service information before traveling.