Complainants instituted this suit to set aside an order of the Interstate Commerce Commission prohibiting the transportation of private passenger train cars, including so-called office cars of other carriers, free or at other than published tariff rates. Held, the transportation of a private or office car of another carrier is subject to the filed tariffs which "apply to all traffic transportation and facilities" defined in the Interstate Commerce Act. L. & N. R. Co. and others v. United States, U. S. Sup. Ct. 1931, Adv. Op. No. 333, 51 Sup. Ct. 39.