# The Railways (Accident Investigation and Reporting) Regulations 2005, Paragraph 4


A derailment of rolling stock on a running line that was open to railway traffic at the time of the derailment, or which blocks a running line that was open to railway traffic at the time of the derailment.

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Source: https://www.legislation.gov.uk/uksi/2005/1992/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/railways-accident-investigation-and-reporting-regulations-2005/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.