Mr. Justice Jackson
delivered the opinion of the Court.
By schedules filed with the Interstate Commerce Commission to become effective October 15, 1939, the appellant eastern railroads1 sought to deny grain arriving at Chicago by barge over the Illinois Waterways the privilege of moving out of Chicago by rail on “proportional” rates applicable to competing grain arriving at Chicago by lake steamer or rail. The only other rates on which the ex-barge grain could move eastward by rail from Chicago were “local” rates, which were in all cases higher than the existing “proportional” rates. The proposed schedules were protested by barge lines and others desirous of maintaining the existing proportionals as to ex-barge grain.
Understanding of the controversy thus precipitated and the consequent litigation which has brought it to this Court requires a statement of the rather complicated rate structure to which the proposed schedules related.
The proposed schedules applied to grain, grain products and grain by-products, but for convenience we refer to them all as “grain.” They dealt not only with grain com[674]*674ing by barge via the Illinois Waterways to Chicago, but also with grain so arriving at Peoria, Illinois, St. Louis, Missouri, and other related rate-break points. Chicago is illustrative of all, and for convenience we shall follow the practice employed by the parties in briefs and argument, and confine our discussion to it.
Grain originating at Chicago, grain brought there by truck, or by rail under intrastate rates, and grain which had forfeited its transit privileges, moved eastward by rail from Chicago on local rates. Their validity as such has not been questioned in this case.
Grain originating at certain places distant from Chicago had the privilege, however, of moving eastward from Chicago by rail on the lower proportional rates, although it came to rest at Chicago for marketing or processing. These “proportionals” varied according to the region of origin or the region of destination; and, in some instances, according to both.
“Official Territory” lies east of Chicago, and is divided into “Central Territory,” “Trunk-line Territory,” and “New England Territory.” Central Territory lies west of a line drawn through Pittsburgh and Buffalo. To this territory there were three different sets of proportionals, set with reference to the territory of origin.
Grain originating at certain points in Illinois moved out of Chicago by rail to Central Territory on “Illinois ReShipping” proportionals, which, however, did not apply to ex-barge grain and were not affected by the proposed schedules.
Grain originating in “Northwest Territory” moved out of Chicago by rail to Central Territory on “Northwest” proportionals, which were in some instances higher, and in others lower, than the Illinois Re-Shipping proportionals. As first published, these proportionals applied only to grain originating in Northwest Territory, which comprises generally North Dakota, South Dakota, Minne[675]*675sota, Wisconsin, the upper peninsula of Michigan, Montana, Wyoming, Idaho, Oregon, Washington, and certain Canadian provinces. The Northwest proportionals were originally and have continued to be applicable on grain arriving at Chicago by lake. In 1932 the Northwest proportionals were amended to make them apply to shipments which “arrived by boat line at Chicago . . .” At the time this wording was put into the tariffs the only water-borne grain to which they applied was that arriving from the Northwest by boat over the Great Lakes. The Commission has decided that the effect of this amendment was to make the Northwest proportionals apply to grain arriving by barge over the Illinois Waterways, which were opened in the following year, 1933; and we accept its determination of this issue. While shipping points along the Waterways vary from 57.5 to 200.9 miles in distance from Chicago, some grain arriving there by barge originated at points as far beyond as Kansas City and St. Louis. The Northwest proportionals were the only ones which applied to ex-barge grain moving out of Chicago by rail to Central Territory, and the proposed schedules cancelled them as to such grain.
Grain brought by rail from “Trans-Mississippi Territory,” which included, among other places, Kansas City and St. Louis, moved out of Chicago to Central Territory on “Trans-Mississippi” proportionals, which had been set by the Commission 3 cents lower than the Northwest proportionals, in order to equalize the Twin Cities with Kansas City. The Trans-Mississippi proportionals did not apply to grain coming from these points by barge, and therefore such grain had to pay a higher rate for the outbound haul than was required of grain coming from them by rail. No complaint has been made, however, of this; and the appellees have been content to assert that they are entitled to the Northwest proportionals as to such grain.
[676]*676“Trunk-line Territory” lies between Central Territory and New England Territory, which comprises the New England States. To Trunk-line and New England Territories the proportionals did not vary with the point of origin of the grain. These proportionals applied to grain coming to Chicago by barge over the Illinois Waterways, and the proposed schedules cancelled them as to such grain. The existing schedules provided that “in no case shall the combination through rate to and from the reshipping point via rail be less than the local rate from the re-shipping point to destination, the difference necessary to protect the local rate from the re-shipping point to be added to the re-shipping rate therefrom.” No such provision was made with respect to the barge-rail traffic, and the Commission found accordingly that “the barge-rail rates are far below the local rates from the re-shipping points in contravention of the fourth-section rule,2 while the all-rail rates are in strict conformity with that rule.”
[677]*677When the proposed schedules were filed with the Commission, that body, acting pursuant to its authority under § 15 (7) of the Act,3 suspended them for the allowable [678]*678period of seven months and entered upon a hearing of their lawfulness. The last testimony was heard, and the record in the case closed, on January 26, 1940. On September 18, 1940, the President approved the Transportation Act of 1940.4 Thereafter the appellee Inland [679]*679Waterways Corporation requested the Commission to dispose of the proceeding in the light of the new Act. On July 31, 1941, Division 2 of the Commission found that “the proportional rates here in issue have never been applicable on this barge traffic moving on unfiled rates,” and that “the schedules under suspension are not shown to be unlawful.” It announced that an order would be entered vacating the already expired order of suspension and discontinuing the proceedings.5 When the period of compulsory suspension ended, the carriers had voluntarily continued the suspension.
In its petition for rehearing and reconsideration of this report the Inland Waterways Corporation asserted that the Commission had permitted discrimination against a connecting line forbidden by § 3 (4) of the Interstate [680]*680Commerce Act as amended by the Transportation Act of 1940.6
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Mr. Justice Jackson
delivered the opinion of the Court.
By schedules filed with the Interstate Commerce Commission to become effective October 15, 1939, the appellant eastern railroads1 sought to deny grain arriving at Chicago by barge over the Illinois Waterways the privilege of moving out of Chicago by rail on “proportional” rates applicable to competing grain arriving at Chicago by lake steamer or rail. The only other rates on which the ex-barge grain could move eastward by rail from Chicago were “local” rates, which were in all cases higher than the existing “proportional” rates. The proposed schedules were protested by barge lines and others desirous of maintaining the existing proportionals as to ex-barge grain.
Understanding of the controversy thus precipitated and the consequent litigation which has brought it to this Court requires a statement of the rather complicated rate structure to which the proposed schedules related.
The proposed schedules applied to grain, grain products and grain by-products, but for convenience we refer to them all as “grain.” They dealt not only with grain com[674]*674ing by barge via the Illinois Waterways to Chicago, but also with grain so arriving at Peoria, Illinois, St. Louis, Missouri, and other related rate-break points. Chicago is illustrative of all, and for convenience we shall follow the practice employed by the parties in briefs and argument, and confine our discussion to it.
Grain originating at Chicago, grain brought there by truck, or by rail under intrastate rates, and grain which had forfeited its transit privileges, moved eastward by rail from Chicago on local rates. Their validity as such has not been questioned in this case.
Grain originating at certain places distant from Chicago had the privilege, however, of moving eastward from Chicago by rail on the lower proportional rates, although it came to rest at Chicago for marketing or processing. These “proportionals” varied according to the region of origin or the region of destination; and, in some instances, according to both.
“Official Territory” lies east of Chicago, and is divided into “Central Territory,” “Trunk-line Territory,” and “New England Territory.” Central Territory lies west of a line drawn through Pittsburgh and Buffalo. To this territory there were three different sets of proportionals, set with reference to the territory of origin.
Grain originating at certain points in Illinois moved out of Chicago by rail to Central Territory on “Illinois ReShipping” proportionals, which, however, did not apply to ex-barge grain and were not affected by the proposed schedules.
Grain originating in “Northwest Territory” moved out of Chicago by rail to Central Territory on “Northwest” proportionals, which were in some instances higher, and in others lower, than the Illinois Re-Shipping proportionals. As first published, these proportionals applied only to grain originating in Northwest Territory, which comprises generally North Dakota, South Dakota, Minne[675]*675sota, Wisconsin, the upper peninsula of Michigan, Montana, Wyoming, Idaho, Oregon, Washington, and certain Canadian provinces. The Northwest proportionals were originally and have continued to be applicable on grain arriving at Chicago by lake. In 1932 the Northwest proportionals were amended to make them apply to shipments which “arrived by boat line at Chicago . . .” At the time this wording was put into the tariffs the only water-borne grain to which they applied was that arriving from the Northwest by boat over the Great Lakes. The Commission has decided that the effect of this amendment was to make the Northwest proportionals apply to grain arriving by barge over the Illinois Waterways, which were opened in the following year, 1933; and we accept its determination of this issue. While shipping points along the Waterways vary from 57.5 to 200.9 miles in distance from Chicago, some grain arriving there by barge originated at points as far beyond as Kansas City and St. Louis. The Northwest proportionals were the only ones which applied to ex-barge grain moving out of Chicago by rail to Central Territory, and the proposed schedules cancelled them as to such grain.
Grain brought by rail from “Trans-Mississippi Territory,” which included, among other places, Kansas City and St. Louis, moved out of Chicago to Central Territory on “Trans-Mississippi” proportionals, which had been set by the Commission 3 cents lower than the Northwest proportionals, in order to equalize the Twin Cities with Kansas City. The Trans-Mississippi proportionals did not apply to grain coming from these points by barge, and therefore such grain had to pay a higher rate for the outbound haul than was required of grain coming from them by rail. No complaint has been made, however, of this; and the appellees have been content to assert that they are entitled to the Northwest proportionals as to such grain.
[676]*676“Trunk-line Territory” lies between Central Territory and New England Territory, which comprises the New England States. To Trunk-line and New England Territories the proportionals did not vary with the point of origin of the grain. These proportionals applied to grain coming to Chicago by barge over the Illinois Waterways, and the proposed schedules cancelled them as to such grain. The existing schedules provided that “in no case shall the combination through rate to and from the reshipping point via rail be less than the local rate from the re-shipping point to destination, the difference necessary to protect the local rate from the re-shipping point to be added to the re-shipping rate therefrom.” No such provision was made with respect to the barge-rail traffic, and the Commission found accordingly that “the barge-rail rates are far below the local rates from the re-shipping points in contravention of the fourth-section rule,2 while the all-rail rates are in strict conformity with that rule.”
[677]*677When the proposed schedules were filed with the Commission, that body, acting pursuant to its authority under § 15 (7) of the Act,3 suspended them for the allowable [678]*678period of seven months and entered upon a hearing of their lawfulness. The last testimony was heard, and the record in the case closed, on January 26, 1940. On September 18, 1940, the President approved the Transportation Act of 1940.4 Thereafter the appellee Inland [679]*679Waterways Corporation requested the Commission to dispose of the proceeding in the light of the new Act. On July 31, 1941, Division 2 of the Commission found that “the proportional rates here in issue have never been applicable on this barge traffic moving on unfiled rates,” and that “the schedules under suspension are not shown to be unlawful.” It announced that an order would be entered vacating the already expired order of suspension and discontinuing the proceedings.5 When the period of compulsory suspension ended, the carriers had voluntarily continued the suspension.
In its petition for rehearing and reconsideration of this report the Inland Waterways Corporation asserted that the Commission had permitted discrimination against a connecting line forbidden by § 3 (4) of the Interstate [680]*680Commerce Act as amended by the Transportation Act of 1940.6 It suggested that the Commission fix the existing proportional rates as the proper ones, stating that: “Theoretically, the Commission is not limited to a choice between the unlawful proposed rates and the present rates, but may, upon an adequate record, prescribe some different basis of rates for the future. Actually, no different proposal has been introduced which could support a different basis of rates than those presently in effect. That fact, however, cannot possibly militate to justify the proposed rates, but could only compel the postponement of any change in the present tariffs pending further hearing, and the introduction of a lawful proposal.”7
The decision of the whole Commission on reconsideration was announced on December 1,1941.8 In it the Commission took official notice that certain of the protestant barge carriers had attained common carrier status under the Act, and stated that “no useful purpose would be served by further hearing or reargument.” 9 The Commission reviewed the existing rate structure and the probable effects of the proposed changes in operation as contrasted to the effects of denying them, and said:
“The proposed schedules will not prohibit the movement by barge-rail even to trunk-line territory, their prin[681]*681cipal commercial effect being to reduce the profits of the Chicago elevator operators. . . .10
“Protestants maintain that the proposed schedules will be unreasonable, unjustly discriminatory, and unduly prejudicial . . . and unduly preferential. . . . This is based primarily on the fact that under the proposed schedules the ex-barge rates will be higher than the ex-rail or ex-lake rates, although in each instance the physical carriage beyond the reshipping point is substantially the same. But the latter is also true of local grain, grain brought in by truck, or by rail under intrastate rates, or grain which has forfeited its transit privileges. To adopt protestants’ premise would mean that all proportional rates lower than local rates and differing from each other according to the origin of the commodity would have to be condemned. As pointed out by the division, reshipping or proportional rates are in their essence balances of through rates. Such balances are, of course, determined by the measure of the in-bound and through rates, and properly may vary according to the relative length and nature of the in-bound and through service. It follows that the protestants’ allegations cannot be sustained in this proceeding, although in a proper proceeding we might prescribe proportional rates on the ex-barge traffic: lower than local rates or joint barge-rail rates lower than the combinations.
“The facts of record, as detailed by the division and summarized herein, clearly show that respondents are justified under section 1 in treating the ex-barge traffic the same as local or ex-truck traffic and that the proposed [682]*682schedules cannot be condemned as unlawful under sections 2 and 3 of the act.
“On reconsideration of the record in the light of the petitions and replies thereto and our prior decisions, we find that:
“(1) The proportional rates here under consideration were legally applicable on the ex-barge traffic where the so-called policing provisions were strictly complied with.
“(2) The proposed schedules are shown to be just and reasonable and are not shown to be otherwise unlawful.”
Accordingly the Commission ordered:
“That the order heretofore entered in this proceeding, suspending the operation of the schedules enumerated and described in said order, be, and it is hereby, vacated and set aside as of December 22,1941, and that this proceeding be discontinued.”
After the Commission had announced its decision and on December 12, 1941, appellant Mechling Barge Lines sought to intervene on the ground that since the record had been closed it had become a regular common carrier by water of grain by barge to Chicago and other rate-break points, and was entitled to the protection afforded to such carriers by the Transportation Act of 1940. It urged that the decision be set aside and, if it should be thought necessary to this end, that it be given an opportunity to introduce evidence. This was the first offer to assist the Commission in any way in the establishment of proportional rates fixed with reference to the ex-barge grain. No specific suggestion was made, however, as to the amount of such rates or as to the evidence which would be introduced in support. This petition was denied by the Commission on January 21, 1942.
On January 16, 1942, the Inland Waterways Corporation had filed its complaint in the United States District Court seeking an injunction against the enforcement of the Commission’s order. Various other parties were allowed to intervene in the case as plaintiffs and defend[683]*683ants. The Attorney General did not participate, giving as his reason the existence of a conflict in litigation between coordinate.agencies of the Government, the Agricultural Adjustment Administration and the Interstate Commerce Commission. The opinion of the specially constituted three-judge District Court was announced on April 16, 1942.11 It stated that “The Interstate Commerce Commission took no evidence addressed to the issue whether the rate proposal in question is in violation of Section 3 (4) of the Interstate Commerce Act, as amended by the Transportation Act of 1940, or contrary to the National Transportation Policy enacted by the last said act; but the Interstate Commerce Commission passed upon the legality of said rate proposal upon evidence taken without reference to such issues and before they existed.” It concluded that the order was of a “character which this Court is authorized to enjoin and set aside,” and should be set aside on the ground that it “discriminates against water competition by the users of barges.” It decreed that the Commission’s order vacating the already-expired suspension of the proposed schedules and discontinuing the proceedings be annulled and that the railroads be “permanently enjoined . . . from acting upon the authority of the aforesaid order.”
The case is here on appeal.12
In the proceedings before the Commission the protestants pitched their case upon two propositions: (1) To deny the ex-barge grain the benefit of proportionals sought to be cancelled was necessarily unlawful since the physical carriage beyond Chicago was substantially the same, no matter where the grain originated; (2) Since denial of that benefit was necessarily unlawful, the Commission was [684]*684bound to maintain the status quo by cancelling the proposed schedules and thus perpetuating the existing rate structure, whatever might be its defects.
As the Commission correctly observed with reference to the first contention, “to adopt protestants’ premise would mean that all proportional rates lower than local rates and differing from each other according to the origin of the commodity would have to be condemned.”
Proportional rates so differing and lower than local rates for like outbound transportation have a long history, antedating the Interstate Commerce Act itself. Long hauls have generally been thought entitled to move at a rate less than the sum of the rates for local or short hauls between intermediate points. The practice of routing commodities such as grain to centers for marketing and processing has been widespread and often a necessary feature of the process of distribution. In many instances stopovers for marketing and processing have not been considered as disrupting-the continuity of transportation to more distant points, and consequently the grain has been allowed to move on at a rate lower than the outbound rate on grain originating locally and not from a distance.13 To get the outbound business competing carriers frequently would offer rates similarly computed.14 Proportional rates established on this reasoning15 have become deeply embedded in the transportation system of the country, and have been approved by the Interstate Commerce Commission,16 by the federal courts, this one in-[685]*685eluded;17 and, so far as it has spoken on the subject, by Congress itself.18 We see no reason for repudiating them now.
Having pointed out the error of the protestante basic contention, the Commission stated that: “It follows that the protestante’ allegations cannot be sustained in this proceeding, although in a proper proceeding we might prescribe proportional rates on the ex-barge traffic lower than local rates or joint barge-rail rates lower than the combinations.” Pending the commencement of such a proceeding it ordered the vacation of the already-expired order of suspension and ordered the discontinuance of the instant proceedings.
Despite this statement, much of the argument in this Court has proceeded upon the assumption that the Commission’s order resulted from its belief and findings that the discrepancies between the proportional rates not can-celled in the proposed schedules and the local rates as applied to ex-barge grain were in all respects lawful, and that it actually approved or prescribed a rate structure containing such discrepancies. We do not so understand the action of the Commission.
True, the Commission stated that the railroads “are justified under section 1 in treating the ex-barge traffic the same as local or ex-truck traffic,” and found that “the proposed schedules are shown to be just and reasonable.” But this does not constitute a finding that the rates were lawful; they “may lie within the zone of reasonableness and yet result in undue prejudice” or otherwise violate the Act.19 The Commission also stated that the facts of record [686]*686show that “the proposed schedules cannot be condemned as unlawful under sections 2 and 3 of the act-.” 20 But this statement followed immediately upon the Commission’s statement that from its conclusion that protestants’ claim as a matter of right to the existing proportionals was erroneous, “It follows that the protestants’ allegations cannot be sustained in this proceeding, although in a proper proceeding we might prescribe proportional rates-on the ex-barge traffic lower than local rates or joint barge-rail rates lower than the combinations.” Read in the context, we think it meant only that the proposed schedules could not be. struck down upon the erroneous view advanced by the protestants. The finding of the Commission that the proposed schedules “are not shown to be otherwise unlawful” is, we think, to be similarly read. This form of finding has been held by the Commission not to constitute an approval or a prescription of the rates under suspension.21 Since the Commission refused to approve or prescribe [687]*687them, they stand only as carrier-made rates which, under the Commission’s decisions, leaves them open to possible recovery of reparations.22 Like the Commission, we also refrain from approving or prescribing them.
The case had been developed before the Commission upon the theory that the proposed schedules must stand or fall in their entirety. There has been no suggestion, nor is it apparent, that it would have been feasible for the Commission to pick and choose among the items in the existing and proposed schedules.
To perpetuate the existing rate structure by sustaining the District Court’s injunction would entail numerous and serious violations of § 4 (1).23 Under that rate structure, ex-barge grain moved from Illinois River points to Baltimore, New York and Boston at combination rates lower than the local rates for domestic grain from all points in Central Territory west of a line running south from Bay City, Michigan, through Port Wayne and Indianapolis, Indiana. So also did the ex-barge grain move out at combination rates lower than local export rates on grain from all points in Central Territory west of a line running southwardly and south along the Indiana-Ohio line; and lower than the local export rates on corn from all points in Central Territory west of a line between Paynesville and East Liverpool, Ohio, near the Pennsylvania line. Unlike the barge-rail rate, the all-rail rates are, as the Commission has found, in strict conformity with § 4 (1). Congress by the Transportation Act of 1940 amended § 4 (1), but nowhere in the Act or in its legislative history is there any suggestion that from the mere fact that grain moving from beyond Chicago to New York travels by barge for the 60-mile leg of its journey to Chicago — less [688]*688than one percent of the total haul — it shall as matter of law be entitled to a rate from beyond Chicago to the seaboard less than that from the Pennsylvania line to the seaboard.24
Appellees make no better showing with respect to the effect of the injunction on the rate structure west of Chicago. To sustain the injunction would require a holding that grain originating 60 miles from Chicago must as matter of law be given the benefit of proportionals fixed with reference to grain from the Northwest Territory, embracing points in Canada and as far west in the United States as Washington and the Dakotas. In addition to the disparity in distances, there is the further fact that the grain from the Northwest is predominately wheat, while that from the territory served by the barge lines is predominately corn from Illinois. Nothing in the Interstate Commerce Act as amended by the Transportation Act of 1940, or in the statements of even the most ardent Congressional champions of water transportation, affords the slightest warrant for a decision that the Commission must treat as legally identical such widely disparate factual situations.
Finally it is claimed that the Commission was obliged to continue the § 15 (7) proceedings and establish special proportionals for the barge lines under § 6 (11) of the Act.25 [689]*689This duty is claimed by appellees to derive from the provision of § 15 (7) that after suspension and hearing of a proposed rate change the Commission “may make such order with reference thereto as would be proper in a proceeding initiated after it had become effective.” (Italics supplied.) The construction contended for would have the effect either of imposing a practically impossible burden upon the Commission or of making resort to the Commission's powers under § 15 (7) so rare as to make such powers of little practical significance. Suspension cases are very numerous, and in many of them the construction contended for would require the Commission to “readjust the entire rate structure of an important section of the country.” 26 We have already noted the breadth of the rate structure here involved. To require the present proceedings to be continued until proportionals can be set with reference to the barge transportation would hardly be within the intention of Congress, which in terms made the Commission’s power discretionary, and legislated upon the assumption, formed after much experimentation with the period of suspension,27 that suspension cases could nor[690]*690mally be carried to completion within seven months and to that end commanded in § 15 (7) that “the Commission shall give to the hearing and decision of such questions preference over all other questions pending before it and decide the same as speedily as possible.”
The record had been closed on January 26, 1940, when the last testimony was heard. The Transportation Act of 1940 was not enacted until September 18. At the time the evidence was taken it was not clear whether some of the barge lines operating in the waterway were common carriers, and none had obtained certificates of convenience and necessity from the Commission as now required. They had not filed reports with the Commission from which the results of their own operations might be judged, and they had not filed tariffs showing their rates. All of this has since changed. The applicable law has changed. The issues raised by the position of the parties did not call [691]*691for a fixing of new combination rates, for it was contended barge grain was entitled to the existing proportionals.
The policy provisions of the Transportation Act of 1940, as well as the specific statutory provisions, provide only standards of considerable generality and some overlapping. It requires administration to “recognize and preserve the inherent advantages of each” — rail, water, and motor transport. It also seeks “sound economic conditions” for all kinds of transportation.28 For more than a year after the enactment of this Act, and until after the Commission had finally disposed of the case, appellees showed no disposition to make proposals or to develop a record upon the basis of which the Commission might prescribe rates in view of their particular circumstances and under the provisions of the Act designed with reference to them. Instead they relied upon the erroneous view that they were by law entitled to the fortuitous and in many respects unlawful benefits of the existing rate structure. Their nearly four years of litigation have not, however, been in vain, for during all this time they have managed to keep the proposed schedules in abeyance — first by compulsory suspension for the allowable period of 7 months at the hands of the Commission, then by the railroads’ voluntary act at the expiration of that period, and finally by the compulsion of the District Court’s injunction.
Our function does not permit us either to prescribe or approve rates, and our decision carries no implication of approval of any rates here involved. Nor are we at liberty to prescribe general attitudes the Commission must adopt towards the exercise of discretion left to it rather than to courts. We decide only whether the Commission has acted within the power delegated to it by law. We are of [692]*692opinion that it has and that the decision of the court below must be
Reversed.
Mr. Justice Rutledge did not participate in the consideration or decision of this case.