# The Railways (Interoperability) (High-Speed) Regulations 2002, Paragraph 1.1


basically structural areas:
infrastructures
energy
control and command and signalling
rolling stock;

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Source: https://www.legislation.gov.uk/uksi/2002/1166/schedule/2/paragraph/1.1 (the official version)
Page: https://openlegislation.uk/railways-interoperability-high-speed-regulations-2002/schedule-2/paragraph-1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.