“ This is an appeal from the decree of the District Court, composed of three judges as required by the statute, enjoining the appellants from enforcing an order of the Railroad Commission of Wisconsin fixing rates to be charged by the receiver of the Washburn Water Works Company for supplying water. ”

“ In Lawrence et al. v. St. Louis-San Francisco Railway Co., supra, the court said: 'The importance of an opinion to litigants and to this court in cases of this character was pointed out in Virginian Ry. ”