A summary of each contract for the transportation of agricultural products (including grain, as defined in section 3 of the United States Grain Standards Act (
7 U.S.C. 75) and products thereof) entered into under this section shall be filed with the Board, containing such nonconfidential information as the Board prescribes. The Board shall publish special rules for such contracts in order to ensure that the essential terms of the contract are available to the general public.