It was established that once the trench effect became established, the 'piston effect' from trains would not have played an important role in the rapid spread of the fire up the escalator and into the ticketing hall. This trench effect was seen to cause hot gases in the buoyant plume to lay along the escalator surface and create a rapid airflow which caused these gases to curl over and over towards the next steps above. The airflows in the trench increased in proportion to the size of the fire, eventually creating a flamethrower type effect up and into the ticketing hall.
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