An electricity supply failure between Stevenage and Finsbury Park, specifically near Welwyn Garden City, is causing widespread disruption to rail services through London King’s Cross on September 18, 2026.
Affected Services and Disruption
Rail operators including Great Northern, Grand Central, Hull Trains, LNER, Lumo, and Thameslink are impacted by the fault. Services are experiencing cancellations, delays, alterations, and frequency reductions. Network Rail stated that these disruptions are expected to continue until at least 12:00 BST today.
Great Northern is running a reduced service during peak times between Peterborough and London. Additionally, a limited peak-time service operates between Hertford North and Moorgate, with some trains
truncated or diverted.
Routes and Ticket Acceptance
Services between King’s Lynn and London King’s Cross are running only between King’s Lynn and Cambridge. Great Northern’s reduced service between Cambridge and London has prompted operators to accept tickets on alternative routes. Passengers holding tickets from Cambridge are permitted to travel on Thameslink services to London St Pancras International, Great Northern trains to King’s Cross, and Greater Anglia services to London Liverpool Street.
LNER customers, whose services are disrupted between London King’s Cross and Peterborough, are advised to check ticket validity for alternative routes via the company’s official website.
Response and Passenger Advisories
Network Rail and electricity suppliers are actively
addressing the power supply fault at Welwyn Garden City to restore normal operations. Passengers on affected routes should anticipate cancellations, delays, and service alterations through the morning.
Travelers are urged to verify their journey status before traveling, given the ongoing issues. The disruption impacts key routes operated by multiple providers serving London King’s Cross station.
Duration and Travel Guidance
The electricity fault is expected to affect rail services until at least midday BST on September 18, 2026, according to National Rail’s early morning update at 6:30 am. Passengers should check the latest travel information and confirm ticket acceptance policies if using alternative routes during
the ongoing service interruptions.
