The 'Department of Transport Railway Construction and Operation Requirements' in respect of underground railways and stations shall be reviewed, together with the letter dated 10 November 1958 to the railway undertakings entitled 'Submission of new works for approval by the Minister under S.41(1) of the Road and Rail Traffic Act 1933', in the light of: (i) the circumstances of the King's Cross fire; (ii) building regulations; (iii) legislation on fire prevention and precautions; and (iv) experience with other underground railway systems.