# The Coal and Other Mines (Locomotives) Order 1956, Paragraph 17


(1) No person shall operate any locomotive in any mine other than a person appointed by the manager of the mine to be a driver of that locomotive or of that type of locomotive (hereinafter referred to as “an appointed driver”) or a person so doing in the course of his duty in connection with the maintenance, repair or testing of that locomotive, and no appointed driver shall operate a locomotive hauling persons in vehicles unless he has attained the age of—
(a) in the case of a mine of shale, eighteen years;
(b) in the case of any other mine, twenty-one years.
(2) A manager shall not appoint any person to be an appointed driver unless that person is the holder of a certificate that he is competent without supervision to operate a locomotive of the type in question given by a person responsible for his training in such operation.
(3) The manager shall supply to every appointed driver a copy or summary of so much of the transport rules of the mine as affect the discharge of his duties.

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Source: https://www.legislation.gov.uk/uksi/1956/1771/schedule/FIRST/paragraph/17 (the official version)
Page: https://openlegislation.uk/coal-and-other-mines-locomotives-order-1956/schedule-FIRST/paragraph-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.