5 V.S.A. § 32

So far as is necessary for the performance of their duties, the members of the Transportation Board or the Secretary of Transportation or his or her designee and any other employee of the Agency authorized by the Secretary shall have power to examine the books, accounts, and papers of any person, receiver, trustee, or lessee owning or operating any line, plant, or property, subject to the Board's or the Agency's jurisdiction, that in any way relate to or contain entries, data, or memoranda concerning any transaction substantially affecting the interests of the State of Vermont or consumers of transportation services within the State. In addition to these powers, they may subpoena witnesses, administer oaths to witnesses, and examine them on all matters over which the Board or Agency has jurisdiction.