Ohio Rev. Code Ann. § 4909.03

All rates, fares, charges, classifications, and joint rates of railroad companies fixed by the public utilities commission shall be in force and be prima-facie lawful for two years from the day they take effect, or until changed or modified by the commission or by an order of a competent court in an action under Chapters 4901., 4903., 4905., 4907., and 4909. of the Revised Code.