20 ILCS 2705/2705-410
The Secretary may authorize any of the Department's officers, employees, or agents to enter upon, inspect, and examine, at reasonable times and in a reasonable manner, the books, documents, records, equipment, and property of and to request information kept in the ordinary course of business from any railroad to the extent necessary to carry out the powers enumerated in Sections 2705-400 through 2705-445. Railroads operating within the State shall provide access to those books, documents, records, equipment, and property and shall provide the information kept in the ordinary course of business that the Department may request. Should any railroad fail or refuse to provide that access or information, the Secretary is hereby granted subpoena power to obtain that access and to require the production of that information. The Department shall pay the reasonable costs associated with providing any such information that is not otherwise already required by law. Any officer, employee, or agent of the Department exercising the powers granted by this Section shall, upon request, display proper credentials. The Department shall exercise all necessary caution to avoid disclosure of confidential information supplied under this Section.
20 ILCS 2705/2705-410