
    ST. LOUIS SOUTHWESTERN RAILWAY COMPANY v. THE UNITED STATES.
    [56 C. Cls. 64; 262 U.S. 70.]
    Judgment was rendered in favor of the United States in the court below. On appeal the judgment was affirmed, and the Supreme Court decided:
    Under the act of March 4, 1913, c. 143, 37 Stat. 797, authorizing the Postmaster General to pay additional compensation, not exceeding 5 per cent, for transportation of mail on railroads on
    
      and after July 1, 1918, for the remainder of the contract terms, on account of increased weight of mails resulting from the parcels post law, the decision of the Postmaster General upon the amount of compensation to be allowed within the limit fixed was conclusive; and a railroad company, which accepted payment, under protest, of amounts so fixed, can not claim more from the Government upon the ground that they were inadequate.
    Transportation of additional mail matter, resulting from the parcel post, even if not requirable under contracts existing when the Parcel Post System was adopted, did not give the transporting company a right to additional compensation, when it was done voluntarily during a period (January 1, 1913, to June 30, 1913) for which Congress has failed to allow such compensation. Act of March 4, 1913, supra.
    
   Mr. Justice Brandeis

delivered the opinion of the Supreme Court April 23,1923.  