Louis Brandeis, United States v. Idaho — Opinion of the Court
“ For whether certain trackage is a 'spur' is a mixed question of fact and law left by Congress to the decision of a court; not to the final determination of either the federal or a state commission.This suit is not one brought to set aside for error or irregularity an order of the Commission on a matter within its juri diction. In such a proceeding the United States is the only party named as defendant; others interested become parties by intervention. ”
