Mr. Justice Brennan
delivered the opinion of the Court.
A schedule of reduced rates proposed by the respondent rail carriers was suspended by the Interstate Commerce Commission for the maximum statutory period of seven months pending a determination whether the reduction was lawful. The statute1 expressly provides that “the [660] proposed change of rate . . . shall go into effect,” if the Commission’s proceeding has not been concluded and an order made within the period of suspension. The Commission did not reach a decision within seven months, or within the following five months during which the respondents voluntarily postponed the change, and the respondents announced that the reduced rates would be put in effect. Thereupon the petitioners2 brought this [661] action in the District Court for the Northern District of Alabama to enjoin the respondents from making the change effective pending the Commission’s decision. The District Court concluded after examination of the pleadings and a brief hearing that “there is grave danger that irreparable injury, loss or damage may be inflicted on ... [petitioners] if the proposed rates go into effect... for which . . . [petitioners] will have no adequate remedy at law.” 3 The court held, however, that § 15 (7) vested [662] exclusive power in the Commission to suspend a change of rate for a limited time and thereby precluded District Court jurisdiction to grant injunctive relief extending the statutory period. The Court of Appeals for the Fifth Circuit affirmed, stating, “Congress, in its wisdom, has fixed seven months as the maximum period of suspension. It seems clear to us that if the courts extend that period, they are in effect amending the statute and that is a matter beyond their power.” 308 F. 2d 181, 186. We granted certiorari, 371 U. S. 859.4 We affirm the judgment of the Court of Appeals.
I.
The Interstate Commerce Commission was granted no power to suspend proposed rate changes in the original [663] Act of 1887. That power first appeared among the 1910 amendments introduced by the Mann-Elkins Act.5 The problem as to whether the application of new rates might be stayed pending decision as to their lawfulness first emerged after the Commission was empowered by the Hepburn Act of 1906 to determine the validity of proposed rates. In the absence of any suspension power in the Commission, shippers turned to the courts for injunc-tive relief. The results were not satisfactory. The lower federal courts evinced grave doubt whether they possessed any equity jurisdiction to grant such injunctions, and the availability of relief depended on the view of a particular court on this much controverted issue.6 The Interstate Commerce Commission was more concerned, however, with certain practical consequences of leaving the question with the courts. In its Annual Reports for the three years before 1910 the Commission had directed attention to the fact that such courts as entertained jurisdiction were reaching diverse results, which engendered confusion and produced competitive inequities. The large expense entailed in prosecuting an action and financing a substantial bond proved prohibitive for many small shippers of modest means. Even when a large shipper secured an injunction, the scope of its relief often protected only that particular shipper, leaving his weaker [664] competitors at the mercy of the new rate.7 Therefore, the Commission reported to Congress, . . as a practical matter the small shipper who can not file the bond can not and does not continue in business under the higher rate.” I. C. C. Annual Report, 1908, p. 12. As an equally serious consequence, the regulatory goal of uniformity was jeopardized by the diverse conclusions reached by different District Courts — even, it appears, as to the reasonableness of a particular rate change. This resulted in disparity of treatment as between different shippers, carriers, and sections of the country, causing in turn “discrimination and hardship to the general public.” I. C. C. Annual Report, 1907, p. 10.
It cannot be said that the legislative history of the grant of the suspension power to the Commission includes unambiguous evidence of a design to extinguish whatever judicial power may have existed prior to 1910 to suspend proposed rates. However, we cannot suppose that Congress, by vesting the new suspension power in the Commission, intended to give backhanded approval to the exercise of a judicial power which had brought the whole problem to a head.
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Mr. Justice Brennan
delivered the opinion of the Court.
A schedule of reduced rates proposed by the respondent rail carriers was suspended by the Interstate Commerce Commission for the maximum statutory period of seven months pending a determination whether the reduction was lawful. The statute1 expressly provides that “the [660] proposed change of rate . . . shall go into effect,” if the Commission’s proceeding has not been concluded and an order made within the period of suspension. The Commission did not reach a decision within seven months, or within the following five months during which the respondents voluntarily postponed the change, and the respondents announced that the reduced rates would be put in effect. Thereupon the petitioners2 brought this [661] action in the District Court for the Northern District of Alabama to enjoin the respondents from making the change effective pending the Commission’s decision. The District Court concluded after examination of the pleadings and a brief hearing that “there is grave danger that irreparable injury, loss or damage may be inflicted on ... [petitioners] if the proposed rates go into effect... for which . . . [petitioners] will have no adequate remedy at law.” 3 The court held, however, that § 15 (7) vested [662] exclusive power in the Commission to suspend a change of rate for a limited time and thereby precluded District Court jurisdiction to grant injunctive relief extending the statutory period. The Court of Appeals for the Fifth Circuit affirmed, stating, “Congress, in its wisdom, has fixed seven months as the maximum period of suspension. It seems clear to us that if the courts extend that period, they are in effect amending the statute and that is a matter beyond their power.” 308 F. 2d 181, 186. We granted certiorari, 371 U. S. 859.4 We affirm the judgment of the Court of Appeals.
I.
The Interstate Commerce Commission was granted no power to suspend proposed rate changes in the original [663] Act of 1887. That power first appeared among the 1910 amendments introduced by the Mann-Elkins Act.5 The problem as to whether the application of new rates might be stayed pending decision as to their lawfulness first emerged after the Commission was empowered by the Hepburn Act of 1906 to determine the validity of proposed rates. In the absence of any suspension power in the Commission, shippers turned to the courts for injunc-tive relief. The results were not satisfactory. The lower federal courts evinced grave doubt whether they possessed any equity jurisdiction to grant such injunctions, and the availability of relief depended on the view of a particular court on this much controverted issue.6 The Interstate Commerce Commission was more concerned, however, with certain practical consequences of leaving the question with the courts. In its Annual Reports for the three years before 1910 the Commission had directed attention to the fact that such courts as entertained jurisdiction were reaching diverse results, which engendered confusion and produced competitive inequities. The large expense entailed in prosecuting an action and financing a substantial bond proved prohibitive for many small shippers of modest means. Even when a large shipper secured an injunction, the scope of its relief often protected only that particular shipper, leaving his weaker [664] competitors at the mercy of the new rate.7 Therefore, the Commission reported to Congress, . . as a practical matter the small shipper who can not file the bond can not and does not continue in business under the higher rate.” I. C. C. Annual Report, 1908, p. 12. As an equally serious consequence, the regulatory goal of uniformity was jeopardized by the diverse conclusions reached by different District Courts — even, it appears, as to the reasonableness of a particular rate change. This resulted in disparity of treatment as between different shippers, carriers, and sections of the country, causing in turn “discrimination and hardship to the general public.” I. C. C. Annual Report, 1907, p. 10.
It cannot be said that the legislative history of the grant of the suspension power to the Commission includes unambiguous evidence of a design to extinguish whatever judicial power may have existed prior to 1910 to suspend proposed rates. However, we cannot suppose that Congress, by vesting the new suspension power in the Commission, intended to give backhanded approval to the exercise of a judicial power which had brought the whole problem to a head.
Moreover, Congress engaged in a protracted controversy concerning the period for which the Commission might suspend a change of rates. Such a controversy would have been a futile exercise unless the Congress also meant to foreclose judicial power to extend that period. This controversy spanned nearly two decades. At the outset in 1910, the proposal for conferring any such power on the Commission was strenuously opposed. The car[665] riers contended that any postponement of rate changes would result in loss of revenue or competitive advantages fairly due them in the interim if the rates were finally determined to be lawful. But this opposition eventually took the form of efforts to limit the time for which suspension might be ordered by the Commission.8 The Mann-Elkins Act authorized a suspension for an initial period not to exceed 120 days with a discretionary power in the Commission to extend the period for a maximum additional six months.9 Ten years later the Esch-Cum-mins Act of 1920 cut the authorized period of extension from six months to 30 days,10 thus reducing from 10 to five months the overall period for which the Commission might order a suspension. Congress was aware throughout the consideration of these measures that some shippers might for a time have to pay unlawful rates because a proceeding might not be concluded and an order made within the reduced time.11 To mitigate that hardship, [666] the 1920 amendments authorized the Commission in such cases to require the carriers to keep detailed accounts of charges collected and to order refunds of excess charges if the Commission ultimately found the rates to be unlawful.12 The suspension provisions took their present form, vesting authority in the Commission to suspend for a maximum period of seven months, in the Act of 1927.13 The accounting and refund provisions of the 1920 law remained. Thus, as we have observed before, the present limitation was “formed after much experimentation with the period of suspension . . . Interstate Commerce Comm’n v. Inland Waterways Corp., 319 U. S. 671, 689.
[667] We cannot believe that Congress would have given such detailed consideration to the period of suspension unless it meant thereby to vest in the Commission the sole and exclusive power to suspend and to withdraw from the judiciary any pre-existing power to grant injunctive relief. This Court has previously indicated its view that the present section had that effect. In Board of Railroad Comm’rs v. Great Northern R. Co., 281 U. S. 412, 429, Chief Justice Hughes said for the Court: “This power of suspension was entrusted to the Commission only.”14 The lower federal courts have also said as much.15 And [668] the commentators on the matter have consistently supported the soundness of that view.16
There is, of course, a close nexus between the suspension power and the Commission’s primary jurisdiction to determine the lawfulness and reasonableness of rates, a jurisdiction to which this Court had, even in 1910, already given the fullest recognition. Texas & Pacific R. Co. v. Abilene Cotton Oil Co., 204 U. S. 426.17 This relationship suggests it would be anomalous if a Congress which created a power of suspension in the Commission because of the dissonance engendered by recourse to the injunction nevertheless meant the judicial remedy to survive. The more plausible inference is that Congress meant to foreclose a judicial power to interfere with the timing of rate changes which would be out of harmony with the uniformity of rate levels fostered by the doctrine of primary jurisdiction.
[669] It must be admitted that Congress dealt with the problem as it affected the relations between shippers and carriers, making no express reference to the interests of competing carriers and their customers such as are involved in the instant case. We see no warrant in that omission, however, for a difference in result. Conflicts over rates between competing carriers were familiar to the Commission long before 1910;18 indeed, the struggle between competing barge and rail carriers has been going on almost since railroads came onto the national scene. Indeed, in another provision of the very same statute Congress in 1910 dealt explicitly with the reduction of rates by railroads competing with water carriers: Section 4 (2) of the Act forbids a rail carrier competing with a water carrier to increase rates once reduced on a competitive service, unless “after hearing by the Commission it shall be found that such proposed increase rests upon changed conditions other than the elimination of water competition.” 49 U. S. C. § 4 (2). In addition § 8 of the Act, 49 U. S. C. § 8, creates a private right of action for damages — based upon conduct violative of the Act — which might be available, though we have no occasion here to decide the question, to a competitor claiming that a proposed rate reduction had been grossly discriminatory. Our holding today therefore means only that the injunction remedy is not available to these petitioners, just as it is unavailable to shippers.
II.
Our conclusion from the history of the suspension power is buttressed by a consideration of the undesirable consequences which would necessarily attend the survival of the injunction remedy. A court’s disposition of an application for injunctive relief would seem to require at least [670] some consideration of the applicant’s claim that the carrier’s proposed rates are unreasonable. But such consideration would create the hazard of forbidden judicial intrusion into the administrative domain.19 Judicial cognizance of reasonableness of rates has been limited to carefully defined statutory avenues of review.20 These considerations explain why courts consistently decline to suspend rates when the Commission has refused to do so, or to set aside an interim suspension order of the Commission.21 If an independent appraisal of the reason[671] ableness of rates might be made for the purpose of deciding applications for injunctive relief, Congress would have failed to correct the situation so hazardous to uniformity which prompted its decision to vest the suspension power in the Commission. Moreover, such a procedure would permit a single judge to pass before final Commission action upon the question of reasonableness of a rate, which the statute expressly entrusts only to a court of three judges reviewing the Commission’s completed task.22
Nor is the situation different in this case if it be suggested that a court of equity might rely upon the Commission’s finding of unreasonableness which preceded the Commission’s suspension ordfer. The Commission’s con[672] sideration of the question, through its Suspension Board, involves only a brief and informal hearing.23 Automatic judicial acceptance of a finding reached in that way would delegate greater effect to such an administrative process than the process itself warrants. As the basis for a judicial decree of a single district judge, such a procedure would be inconsistent with § 15 (1) of the Act, which provides that effective rates may be struck down as unlawful after a “full hearing” by the Commission.24
III.
The petitioners contend that in any event injunctive relief is authorized in this case to enforce the National Transportation Policy.25 They argue that when the rail carriers’ rates go into effect the barge line will inevitably [673] and immediately be driven out of business, contrary to the paramount concern of the policy for the protection of water carriers threatened by rail competition. Apart from the absence of any decisive showing that the barge line would suffer this misfortune, it is clear that nothing in the National Transportation Policy, enacted many years after the 1927 revision of § 15 (7), indicates that Congress intended to revive a judicial power which we have found was extinguished when the suspension power was vested in the Commission. Cf. United States v. Borden Co., 308 U. S. 188, 198-199. Indeed, if anything, the policy reinforces our conclusion. The mandate to achieve a balance between competing forms of transportation is directed not to the courts but to the Commission.26 It is reasonable to suppose that had Congress felt that balance to be in danger of distortion, it would have addressed itself to our problem directly by enhancing the powers granted the Commission to enforce the policy. Surely Congress would not have meant its silence alone to imply the revival of a judicial remedy the exercise of which might well defeat rather than promote the objectives of the National Transportation Policy.
Affirmed.
The four petitioners have contended throughout this litigation that the application of the proposed new rail rates will irreparably injure their respective economic interests, particularly because they threaten to force Arrow out of business. Petitioners further contend that the proposed rates, being substantially lower than the competitive barge [661] rates in effect at the time of filing, unlawfully discriminate against a competing form of transportation. The reductions, in petitioners’ view, will benefit only those users of grain who are equipped to receive very large rail shipments, to the detriment of all receivers off the rail routes, and the smaller rail-side purchasers who lack facilities for receipt and storage of multiple-car shipments. Southern responds that its reductions, at least, were made possible by technological innovations and efficiencies culminating in the inauguration of new aluminum freight cars designed especially for carriage of large grain shipments. Southern also maintains that the proposed rates are both nondiscriminatory and compensatory, and have been necessitated by vigorous competition- against the railroads by unregulated motor carriers on certain routes which the barge lines do not serve.
In the course of the hearings before the Commission, the proposed rates were supported by representatives of the United States Department of Agriculture, the Southern Governors’ Conference, the Southeastern Association of Railroad and Utilities Commissioners, and by various receivers and users of grain throughout the Southeast. On the other hand, the rates were protested by certain barge lines besides Arrow, several receivers of grain by barge, the Tennessee Valley Authority, flour milling interests and certain boards of trade outside the Southeast.
The Court of Appeals also suggested — though the suggestion has not been challenged before this Court — that § 16 of the Clayton Act, 15 U. S. C. § 26, might independently bar the injunctive relief sought here. 308 F. 2d, at 185. That section restricts to the United States, in suits for violations of the antitrust laws, the right to seek injunctive relief against any common carrier “in respect of any matter subject to the regulation, supervision, or other jurisdiction of the Interstate Commerce Commission.” Its applicability would, of course, depend upon whether or not the petitioners’ action rests upon claimed violations of the antitrust laws. Cf. Central Transfer Co. v. Terminal Bailroad Assn., 288 U. S. 469.
It has also been suggested that a judicial power of this sort may have survived by reason of the “saving clause” of the statute, 49 U. S. C. §22 (1). That conclusion would, of course, follow only if prior to the adoption of the Act there had been a clearly recognized equitable power to enjoin proposed rate changes. This, as we have already indicated, was not the case. Moreover, we have generally rejected such constructions of this and similar saving clauses, see, e. g., Texas & Pacific R. Co. v. Abilene Cotton Oil Co., supra; T. I. M. E., Inc., v. United States, 359 U. S. 464, 472-474.