“ Ordinarily the question whether particular commerce is interstate or intrastate is determined by what is actually done, and not by any mere billing or plurality of carriers, and where commodities are in fact destined from one state to another, a rebilling or reshipment en route does not of itself break the continuity of the movement or require that any part be classified differently from the remainder. As this court often has said, it is the essential character of the commerce, not the accident of local or through bills of lading, that is decisive. ”

“ Here, when the cars were started from Illinois and Indiana, it was intended by the shipper, as is expressly conceded, that they should be taken to Columbia, Tennessee, where a portion-a definite portion-of the contents of each was to be taken out and delivered, and that the cars, with the remainder of the contents, should proceed to Mount Pleasant in the same state ”

“ On the contrary, it is a case where the shipper intended from the beginning that the transportation should be continued beyond the destination originally indicated, and where there is nothing which requires that decisive effect be given to the bill of lading. ”