King's Cross fire – Wikipedia, the free encyclopedia
King's Cross fire
From Wikipedia, the free encyclopedia
(Redirected from Kings Cross fire)The King's Cross fire was a devastating underground fire in London on November 18, 1987, which killed 31 people. It burnt out the top level (entrances and ticket halls) of King's Cross St. Pancras London Underground station, a huge interchange station which has platforms on the Victoria, Piccadilly, Northern, Circle, Hammersmith & City, and Metropolitan lines.The fire was caused by rubbish and grease beneath wooden escalators being ignited, probably by a discarded match. Although smoking was banned on the London Underground in February 1985 (a consequence of the Oxford Circus fire), smokers often lit up on their way out of the system. The fire started under the escalator, spread above it, then flashed over and filled the ticket hall with flames and smoke. The subsequent forensic investigation found charred wood in 18 locations beneath the up escalator, which indicated that a number of fires had started previously due to the same cause but had not taken hold; instead they had extinguished of their own accord. All of these small fires were on the right hand (running) side, which is where standing passengers are most likely to light a cigarette (passengers stand on the right to allow others to pass on the left).
The large number of casualties in the fire was an indirect consequence of a combustion phenomenon known as the trench effect, though this was completely unknown prior to the fire. This effect meant that in the early stages of the fire the flames lay down in the escalator rather than burning vertically, so that they heated the steps higher up. In these early stages of the fire, the flames visible to anyone not standing on the burning escalator were a small part of the full story. The majority of the flames were lying down in the escalator trench; only a few protruded above the balustrade and were visible to observers. The lack of visible flames and relatively clean woodsmoke produced, lulled the emergency services into a false sense of security. Many people in the ticket hall believed that the fire was small and thus not an immediate hazard: indeed, an evacuation route from the tunnels below was arranged through a parallel escalator tunnel to the ticket hall above the burning escalator. It is arguable that the evacuation of the station below the fire was unnecessary as fires do not burn downwards. Indeed there was no fire damage below the starting point of the fire whatsoever.
However, once a large enough number of steps had been heated, a flashover occurred on the escalator. When the treads of the escalator flashed over, the size of the fire increased exponentially and a sustained jet of flame was discharged from the escalator tunnel into the ticket hall, setting combustibles in the hall alight. The nature of the smoke changed from clean and thin to black and oily. The 31 casualties were those unable to escape from the ticket hall before succumbing to the effects of the latter type of smoke and the intense heat.
The arrangement of underground hall and escalators functioned all too effectively as an incinerator, temperatures reached 600°C: a BBC television news report called Kings Cross underground station "an efficient furnace".
The Fennell Investigation into the fire prompted the introduction of the Fire Precautions (Sub-surface Railway Stations) Regulations 1989 (usually referred to as the Section 12 Regulations because they were introduced under section 12 of the Fire Precautions Act 1971). These led to: the replacement of all wooden escalators on the Underground, of which only one (at Greenford station) remains as of 2006; the mandatory installation of automatic sprinklers and heat detectors in escalators; mandatory fire safety training for all station staff twice a year; and improvements in emergency services liaison.
One of the 31 victims of the fire remained unidentified until 22 January 2004, when forensic evidence proved that he was 72-year-old Alexander Fallon of Falkirk, Scotland. The previously unidentified victim was immortalized in a 1990 Nick Lowe song, "Who Was That Man?"
