Per Curiam:
The judgment is affirmed. Shields v. Utah Idaho Central R. Co., 305 U. S. 177; Interstate Commerce Comm'n v. Union Pacific R. Co., 222 U. S. 541, 547-548; Los Angeles Switching Case, 234 U. S. 294, 311-312; United States v. American Tin Plate Co., 301 U. S. 402, 411.