These Regulations are made in exercise of the powers conferred by section 8(1) and 23 of, and paragraph 1 of Schedule 4 and paragraph 21 of Schedule 7 to, the European Union (Withdrawal) Act 2018 (c. 16) in order to address failures of retained EU law to operate effectively and other deficiencies (in particular under section 8(2)(a), (b), (c), (d) and (g)) arising from the withdrawal of the UK from the European Union.
Link: The Railway (Licensing of Railway Undertakings) (Amendment etc.) (EU Exit) Regulations 2019
Source: Legislation .gov.uk