In Arkansas Comm. v. Chicago, Etc. R.R, 274 U.S. 597, 603, 47 S.Ct. 724, 726, 71 L.Ed. 1224 (1927), a case involving the Interstate Commerce Commission, it was held: "The intention to interfere with the state function of regulating intrastate rates is not to be presumed. Where there is a serious doubt whether an order of the Interstate Commerce Commission extends to intrastate rates, the doubt should be resolved in favor of the state power."