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4(1)On signifying their approval of the plans the Railways Board may specify any protective works, whether temporary or permanent, which in their opinion should be carried out before the construction of the specified works to ensure the safety and stability of railway property.
(2)Such protective works as may reasonably be necessary for those purposes shall be constructed by the Railways Board with all reasonable dispatch, and the Secretary of State shall not commence the construction of the specified works until the Railways Board shall have notified him that the protective works have been completed.