Louis Brandeis, The Assigned Car Cases — Opinion of the Court
“ Coal cars of railroad ownership, other than those assigned to the loading of railroad fuel coal, are known and will be referred to as 'system cars.' Car distribution rules assume importance only in times of car shortage; that is to say, when car orders exceed car supply. To provide for such periods the capacity of such mine is rated in cars per day. A mine may order cars each day up to but not exceeding its rated capacity and in time of a car shortage generally does so (even though it might not actually have equivalent orders for coal) in order that it may get as many cars as possible. ”
