“ And in the exercise of the sound discretion, which guides the determination of courts of equity, scrupulous regard must be had for the rightful independence of state governments and a remedy infringing that independence which might otherwise be given should be withheld if sought on slight or inconsequential grounds. ”

“ The statute makes it unlawful for any railroad in Nebraska to operate any passenger train of more than five cars 'with a crew, consisting of less than one engineer, one fireman, one conductor, one brakeman and one flagman'. Passenger trains of five cars or less are required to be operated with a like crew, except that only 'one brakeman or flagman' is required instead of the one brakeman and one flagman required in the case of trains of more than five cars. ”

“ No citizen or member of the community is immune from prosecution, in good faith, for his alleged criminal acts. The imminence of such a prosecution even though alleged to be unauthorized and hence unlawful is not alone ground for relief in equity which exerts its extraordinary powers only to prevent irreparable injury to the plaintiff who seeks its aid. ”