An investigation into a train derailment near Lewes finds a track defect as a contributing cause. The inquiry identifies the problem on the rail line rather than attributing the incident to a specific operational error, according to reporting from multiple outlets.

The Belfast Telegraph reports that investigators locate a defect on the track. The Evening Standard adds that CCTV footage from services running before the derailment shows the fault, providing evidence that the issue was present ahead of the incident. Together, the accounts describe a focus on the condition of the infrastructure and the timing of when the defect became visible.

Both outlets frame the investigation as ongoing, with the defect discovery central to how investigators establish the sequence leading up to the derailment. Differences in emphasis center on the evidence presented—general findings about the defect versus the use of CCTV from preceding trains—to support the conclusion.