# The Train Driving Licences and Certificates Regulations 2010, Paragraph


The minimum frequency of the periodic checks shall be as follows—
(a) linguistic knowledge (only for non-native speakers): every three years or after any absence of more than one year,
(b) infrastructure knowledge (including route and operation rules knowledge): every three years or after any absence of more than one year on the relevant route,
(c) knowledge of rolling stock: every three years.

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Source: https://www.legislation.gov.uk/uksi/2010/724/schedule/6/part/paragraph/wrapper26n1 (the official version)
Page: https://openlegislation.uk/train-driving-licences-and-certificates-regulations-2010/schedule-6/part/paragraph-wrapper26n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.