“ The Commission approved the merger, subject to routing and gateway conditions to protect competing railroads. It recognized that the merger would eliminate competition and create a rail monopoly in parts of Florida. But it found that the merged lines carried only a small part of the total traffic in the area involved; that ample rail competition would remain therein; and that the reduction in competition would 'have no appreciably injurious effect upon shippers and communities.' Seaboard Air Line Railroad Co., 320 I.C.C. 122, 167. ”

“ The Commission remains obligated to 'estimate the scope and appraise the effects of the curtailment of competition which will result from the proposed (acquisition) and consider them along with the advantages of improved service (and other matters in the public interest) to determine whether the (acquisition) will assist in effectuating the over-all transportation policy.' 321 U.S. at page 87, 64 S.Ct. at page 381.'
The same criteria should be applied here to the proposed merger. It matters not that the merger might otherwise violate the antitrust laws ”

“ Great Northern R. Co., 343 U.S. 562, 578, 72 S.Ct. 985, 994, 96 L.Ed. 1142 (1952) , and we indicate no opinion on the same. We therefore vacate the judgment of the District Court and remand the case to it for a full review of the administrative order and findings pursuant to the standards enunciated by this Court. ”