The decree of dismissal by the specially constituted District Court is affirmed. Standard Oil Company (Indiana) v. United States, ante, p. 235; United States v. Louisville & Nashville R. Co., 235 U. S. 314, 320; Interstate Commerce Comm. v. Delaware, Lackawanna & Western R. Co., 220 U. S. 235, 251; Interstate Commerce Comm. v. Illinois Central R. Co., 215 U. S. 452, 470; Baltimore & Ohio R. Co. v. United States ex rel. Pitcairn Coal Co., 215 U. S. 481, 494.