text: When the wooden treads of the escalator flashed over, the size of the fire increased dramatically and a sustained jet of flame was discharged from the escalator tunnel into the model ticket hall.The 30-degree angle of the escalators was discovered to be crucial to the incident, and the large number of casualties in the fire was an indirect consequence of a fluid flow phenomenon that was later named the trench effect, a phenomenon completely unknown before the fire. The conclusion was that this newly discovered trench effect had caused the fire to flash over at 19:45. London Underground was strongly criticised in the report for its attitude to fires underground, underestimating the hazard because no one had died in a fire on the Underground before. Staff were expected to send for the LFB only if the fire was out of control, dealing with it themselves if possible. Fires were described as "smouldering", and staff had little or no training to deal with fires or evacuation. Legacy
  The publication of the report led to resignations of senior management of both London Underground and London Regional Transport (LRT), including Keith Bright, the chairman of LRT. 