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Lewes derailment track defect before incident
Archived — this story has rotated out of today’s deck. It is kept here in full.
The gist
Investigators found a track defect before a Lewes derailment injured 30. The cause may be heat-buckled rails on a hot day.
Background
On August 13, 2026, a Southern Rail train derailed near Lewes, East Sussex, injuring 30 people, two seriously. The Rail Accident Investigation Branch (RAIB) has released an interim report finding a 'track geometry irregularity' on the approach to the derailment point, with images suggesting possible heat-buckled track. The incident occurred during a period of hot weather, and the investigation is considering the role of temperature.
How it unfolded
- Aug 13, 2026A Southern Rail train from Haywards Heath to Lewes derailed, with three carriages sliding down an embankment. About 150 people were on board; 30 were injured, two seriously.
- Aug 14, 2026A Greater Anglia train derailed in Wickford, Essex, in a separate incident. A landslip also disrupted services between Polegate and Eastbourne.
- Aug 19, 2026RAIB publishes interim report revealing a track defect existed before the Lewes derailment, based on CCTV from preceding services. Images suggest possible heat-buckled track.
Who’s saying what
- Official
- RAIB says its investigation will consider the weather as a factor, given the track irregularity and hot conditions.
- Operator
- Network Rail and Southern owner GTR apologised after investigators revealed the possible heat-buckled track.
Still unverified
The exact cause of the track defect is not yet confirmed; heat buckling is a possibility under investigation.