Special rates

§ 6210. Special rates (a) Upon petition by the Postmaster General the Commission shall determine and fix carload or less-than-carload rates for the transportation of fourth class and periodical mail. A railroad shall perform the service at the rates so determined when requested to do so and under the conditions prescribed by the Postmaster General. (b) The Postmaster General may make special arrangements with railroads for the transportation of mail in freight trains at rates not 74 Stat. 692 in excess of the usual and just freight rates in accordance with classifications and tariffs filed with or prescribed by the Commission.