R.I. Gen. Laws § 39-9-9
On the petition of a person desiring to forward milk over a railroad, the division of public utilities and carriers shall ascertain at what rate facilities for carriage of milk under contract or in large quantities are furnished by the railroad corporation, and shall compare the rate with the tariff for the carriage of milk by the can from and to the same places, including a reasonable compensation for the care of milk by the can; and if the tariff for care and carriage by the can is unreasonably more than the rate for its carriage under contract or in large quantities, the division of public utilities and carriers shall revise the tariff and fix rates therefor fairly proportionate with the contract or large quantity rates, and shall notify the corporation of the revision.
R.I. Gen. Laws § 39-9-9