A passenger was left with "life-changing" injuries after a train incident on tracks in Walthamstow, London. The accident led to the full closure of the Victoria line, disrupting services across the city. Emergency services were called to the scene, where a trackside fire caused significant damage. The Elizabeth line also faced chaos due to the incident. Authorities confirmed the injured person is receiving medical attention. Investigations are ongoing to determine the cause of the accident. Commuters reported long delays and confusion as trains were halted. The incident has raised concerns about safety on the London Underground network. Officials have not yet released further details on the cause of the fire or the extent of the damage.