A major issue with the onboard radio communications system used by train drivers and signal operators has led to significant disruptions across the UK rail network, according to National Rail.
The problem stemmed from a failure in the Global System for Mobile Communications-Railway (GSM-R), which is crucial for real-time digital communication, especially in areas like tunnels. This failure followed the installation of new hardware at a major telecommunications hub in Stoke overnight. The upgrade aimed to enhance safety and streamline operations by replacing outdated systems.
National Rail explained that the fault disrupted the automated login process of GSM-R. Because of this, trains couldn’t register their routes at the beginning or deregister at the end of their services. To work around the issue, staff had to connect manually using a “wild card” code, similar to a Wi-Fi password, to regain access to the national network. This workaround delayed many trains by up to 15 minutes, and some trains were even canceled or altered due to the situation.
The BBC reported that the manual backup system had been practiced well, ensuring no safety concerns arose during the outage. Affected rail lines included Great Northern, Northern, ScotRail, Southeastern, Southern, South Western Railway, Thameslink, Gatwick Express, Heathrow Express, and the Elizabeth tube line.
While the issue was resolved within about three hours, National Rail warned that some residual disruption might still occur as schedules get back to normal. For those looking for compensation, National Rail advised customers to keep their train tickets and note their journey details, as this will aid any claims.