This case involves a question of the jurisdiction of the Federal Maritime Board and also the correctness of an order issued by it. The order directed the petitioning railroads to increase from two to five days the "free time" allowed for the loading and unloading of local freight which moves by truck over the railroad piers in Philadelphia. Free time refers to the allowance of a certain period during which no charge is made for the storage of freight on the pier. Following the expiration of free time demurrage is charged. The petitioning railroads contend that the Board is without jurisdiction to make the order which it has made in this case. Secondly, they contend that the order is unreasonable, not supported by substantial evidence, and should be vacated by this court.