Director general Mr Narey - who is also due to give evidence to the select committee - justified the search at the time by saying that among the items recovered there were illegally held credit cards, some forged passports, cameras and escape equipment.

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It can escape accidentally, through broken pipes, valves or other equipment, or be let out on purpose, when it is vented or not fully burnt during flaring.

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Mr. Prendergast and his team won particular praise for successful planning ahead of superstorm Sandy, helping the MTA escape some of the more severe damage to trains and equipment that afflicted other regional transportation systems.

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