“ On July 31, 1937, appellant filed with the Interstate Commerce Commission a passenger tariff establishing a fare of 10 cents for interstate transportation on its downtown line in lieu of the existing fare of 6 cents. The Commission suspended the tariff and after full hearing found that the revenue results to appellant would be more favorable under an 8-cent fare than under a 10-cent fare and further determined that the proposed 10-cent fare would be unreasonable under Sections 1 and 15a of the Interstate Commerce Act, 49 U.S.C.A. §§ 1-15a and that an 8-cent fare had been justified. ”