(b) The commissioner shall promulgate rules and regulations relating to railroad electric power substations which shall provide for safe ingress to and egress from such substations with relation to surrounding areas. Such rules and regulations shall also establish safety guidelines which when implemented will assure that such substations will be maintained under conditions of reasonable security and optimum safety not only for persons authorized for ingress to such substations but also for persons unauthorized for such ingress. 3. The commissioner or officer or employee specially authorized to conduct an investigation or hearing shall have power to examine all books, contracts, records, documents and papers of any person or corporation subject to his supervision, and by subpoena duces tecum to compel production thereof. In lieu of requiring production of originals by subpoena duces tecum, the commissioner may require sworn copies of any such books, records, contracts, documents and papers or parts thereof to be filed with him.