# The Railways (Accident Investigation and Reporting) Regulations 2005, Paragraph 3


A collision that occurs on any line other than a siding, between rolling stock and—
(a) other rolling stock;
(b) an object capable of causing damage to or derailment of the rolling stock; or
(c) a buffer stop.

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Source: https://www.legislation.gov.uk/uksi/2005/1992/schedule/4/paragraph/3 (the official version)
Page: https://openlegislation.uk/railways-accident-investigation-and-reporting-regulations-2005/schedule-4/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.