R.I. Gen. Laws § 39-2-9: Uniform services and rates of carriers.

Every common carrier shall receive and transport all goods, wares, and merchandise offered to him or her by any person, as promptly and upon as favorable terms and conditions as the common carrier is receiving and transporting goods, wares, and merchandise at the place in which the same are offered to be delivered to him or her, in the ordinary course of business, for any other person.