Ind. Code § 8-3-1.5-4

Sec. 4. The department in performing its planning function is authorized to request any railroad to provide such data and information as are necessary for the planning process. Railroads operating within the State shall provide such information within sixty (60) days of the date of the request. Should the railroad fail to provide such information, the department is hereby granted subpoena power for securing this data. The department shall exercise all necessary caution to avoid disclosure of confidential information supplied under this section.