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


The failure of rolling stock on the track caused by—
(a) the failure or seizing of an axle;
(b) the failure of a wheel or tyre, including a tyre loose on its wheel;
(c) the failure of brakes on a train; or
(d) a fire or severe electrical arcing or fusing on rolling stock, whether or not extinguished by a fire-fighting service.

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Source: https://www.legislation.gov.uk/uksi/2005/1992/schedule/5/paragraph/4 (the official version)
Page: https://openlegislation.uk/railways-accident-investigation-and-reporting-regulations-2005/schedule-5/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.