“ Without at all questioning the right of the state of North Carolina, in the exercise of its police authority, to confer upon an administrative agency the power to make many reasonable regulations concerning the place, manner, and time of delivery of merchandise moving in the channels of interstate commerce, it is certain that any regulation of such subject made by the state, or under its authority, which directly burdens interstate commerce, is a regulation of such commerce, and repugnant to the Constitution of the United States. ”

“ And because we confine our decision to the issue which necessarily arises, we do not intimate any opinion upon the question pressed at bar as to whether an order which was solely applicable to purely state business, directing a carrier to deliver property upon a private track beyond the line of the railway company, would be repugnant to the due process clause of the Constitution. ”

“ Viewing the order which is under consideration in this case as an assertion by the corporation commission of its general power to direct carriers engaged in interstate commerce to deliver all cars containing such commerce beyond their right of way and to a private siding, the order manifestly imposed a burden so direct and so onerous as to leave no room for question that it was a regulation of interstate commerce. ”