Ohio Rev. Code § 4909.28
If, upon an investigation under Chapters 4901., 4903., 4905., 4907., and 4909. of the Revised Code, the public utilities commission finds that any existing rate, fare, charge, or classification, any joint rate, or any regulation or practice affecting the transportation of persons or property, or service in connection therewith, is unreasonable or unjustly discriminatory, or that any service is inadequate, it shall determine and by order fix a reasonable rate, fare, charge, classification, joint rate, regulation, practice, or service to be imposed, observed, and followed in the future, in place of that so found to be unreasonable, unjustly discriminatory, or inadequate. A certified copy of each such order shall be delivered to an officer or station agent of the railroad affected, and such order shall of its own force take effect and become operative thirty days after service.
All railroads to which such order applies shall make such changes in their schedules on file as are necessary to conform to such order, and no change shall thereafter be made by any railroad in any such rate, fare, or charge, or in any joint rate, without the approval of the commission.
R.C. § 4909.28