# The Railways (Interoperability) Regulations 2011, Paragraph 2


Modification of subsystems with EC or UK declaration of verification issued before IP completion day
In a case of a modification, which is not a substitution in the framework of maintenance, of a subsystem covered by a UK declaration of verification, or by an EC declaration of verification issued before IP completion day, without prejudice to regulations 12 and 13, the following provisions apply.

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Source: https://www.legislation.gov.uk/uksi/2011/3066/schedule/5/paragraph/2 (the official version)
Page: https://openlegislation.uk/railways-interoperability-regulations-2011/schedule-5/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.