The Cullen Report into the Ladbroke Grove rail crash in 1999 recommended the establishment of an accident investigation body within the Department for Transport along the same lines as the Marine Accident Investigation Branch and the Air Accident Investigation Branch, bodies that have distinguished themselves by their professionalism and objectivity.
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The recommendations of the Cullen inquiry led to the creation in 2003 of the Rail Safety and Standards Board and in 2005 of the Rail Accident Investigation Branch in addition to the Railway Inspectorate.