S.C. Code Ann. § 58-17-1850

The commission must make for each of the railroad corporations doing business in this State, as soon as practicable, a schedule of just and reasonable rates of charges for transportation of passengers and freight cars on each of the railroads. When a lawsuit involves a railroad corporation's charges for the transportation of passengers, freight, or cars or unjust discrimination in relation to these charges, the schedule shall be considered in all of the courts of this State as sufficient evidence that the rates therein fixed are just and reasonable rates of charges for the transportation of passengers, freights, and cars upon the railroad when the schedules have been prepared and published for all the railroad companies organized under the laws of this State as provided in this section. The commission must not be a party to any lawsuit.