Opinion for the court filed by J. SKELLY WRIGHT, Chief Judge.
J. SKELLY WRIGHT, Chief Judge:
In these consolidated cases1 we are called upon to review a final report and order of the Interstate Commerce Commission declining to remove alleged unlawful rates [121]*121from the freight rate structures for recyclable and virgin resource materials transported by the nation’s railroads. The order under review,2 dissented from by three commissioners3 and challenged here by both representatives of recycling industries 4 and the United States,5 reflects the agency’s efforts to comply with Section 204 of the Railroad Revitalization and Regulatory Reform Act of 1976.6 This provision directed the Commission to conduct an expedited investigation into the lawfulness of the rate structures and to order removal of all rates not shown by the railroads to be just, reasonable, and nondiscriminatory.7 We find that the challenged order does not represent a reasoned compliance with the mandate expressed by Congress in Section 204. We therefore vacate the order and remand for further proceedings.
I
The significance and purpose of the investigation required by Section 204 cannot be understood apart from the Commission’s past experience with ratemaking on recyclable materials. That experience occurred largely in the context of general revenue proceedings, in which the Commission’s main task involved determination of the appropriate revenue levels and needs of the railroads, rather than the lawfulness of the rates on these materials. It is to the controversial history 8 of those proceedings that we turn first in placing the investigation under review, and the Commission’s approach and findings therein, in proper perspective.
Under the Interstate Commerce Act9 the initiative for ratemaking is vested in the railroads, subject to approval by the Commission in an appropriate proceeding. One method by which the railroads may initiate a rate increase is by filing a group tariff in which all or substantially all of the nation’s railroads propose an across-the-board percentage increase in rates. In these so-called [122]*122general revenue proceedings the Commission may either find the proposed increase just and reasonable after taking evidence related to the general need for increased revenues,10 or “approve” the increase by declining to declare it unlawful following an investigation.11 The characteristic feature of these proceedings is that the Commission focuses only on the need of the carriers for increased revenues, not on whether any particular application of the increase is just, reasonable, or nondiscriminatory. Nevertheless, the effect of Commission approval of a general increase is to shift the burden of proof from the carriers favoring the increase to complainants later challenging it.12 Once the general increase has been approved, particular applications of the increase may then be challenged in subsequent proceedings under the Act.13
Pursuant to this scheme the Commission approved, over the past decade, a series of annual upward adjustments in rates applicable to recyclable materials.14 Appearing in proceedings to oppose the proposed increases, shippers and representatives of recycling industries contended that the proposed rates and underlying rate structures on recyclable products were unreasonably high and discriminatory when compared with the lower rates and rate structures traditionally prevailing on virgin resource materials. They also maintained that application of the proposed increases to recyclables would adversely affect the environment by discouraging industrial use of recycled products, thereby contributing to depletion of the nation’s virgin resources. In the limited context afforded by general revenue proceedings, and subject to the aforementioned rules governing complainants’ burden of proof, the Commission invariably concluded that complainants had neither met their burden of refuting the railroads’ [123]*123submission of needed revenues, nor otherwise demonstrated that demand for recyclables would be unlawfully reduced as a result of the proposed increase.15 Numerous environmental impact statements and threshold assessment surveys were also prepared,16 concluding that increases in freight rates would have either no effect or a negligible one on industrial use of recycled products.
Throughout this period the Commission steadfastly refused to conduct a broad investigation into the lawfulness of the underlying rate structures on recyclable products. Apparently of the view that such an investigation was unnecessary in light of the findings reached in its general revenue proceedings, the Commission repeatedly declined requests by representatives of the recycling industry to undertake such an investigation,17 and, indeed, vigorously opposed legislation under consideration by Congress that would have required nothing less.18 Prodded by increasing litigation,19 [124]*124however, the Commission, on December 12, 1973, finally instituted an investigation20 into the lawfulness of the rate structures for movements of scrap iron and steel, one of the recyclable materials herein involved. The Commission’s final report, issued on February 4, 1976, confirmed generally its previous findings with respect to scrap iron and steel.21 Citing the relative demand inelasticity of scrap iron and steel to freight rates, and finding that the relationship between scrap iron and iron ore in the steel-making process is complementary and not competitive,22 the report concluded that the rate structures were reasonable and nondiscriminatory. The environmental impact statement prepared for this proceeding also concluded that these rate structures did not have a significant impact on the environment.23
On February 5, 1976 Congress enacted the Regulatory Reform Act, including within it Section 204. This section, in addition to directing the Commission to investigate the rail rate structures for “recyclable materials” and for “competing virgin natural resource materials,” as defined therein,24 expressly reversed, for the purpose of the investigation, the rules normally governing complainants’ burden of proof. It directed the Commission to determine, after a “public hearing during which the burden of proof shall be on” the railroads, whether the “rate structure^], as affected by rate increases applicable to the transportation of such competing materials, is just, reasonable, and nondiscriminatory.”25 Section 204 further instructed the Commission to order removal of all unreasonableness or unjust discrimination from such rate structures.26 The remaining provisions of the statute required the Commission to comply fully with the requirements of NEPA,27 and directed the Environmental Protection Agency28 and the Department of Transportation29 to participate and assist the Commission in carrying out the required investigation.
Responding to this mandate, the Commission instituted the proceeding under review [125]*125on February 25,1976. By order it designated recyclable and virgin resource materials for inclusion within its investigation and instructed the railroads, in accordance with the burden of proof imposed upon them by Section 204, to submit evidence with respect to the costs and revenues derived from their movements of the listed materials.30 It also, by order, incorporated into the record the findings and conclusions of its previous investigation in Ex Parte No. 270.31 After public hearings and submission of verified statements from interested parties, the Commission issued its final report and order, accompanied by draft and final environmental impact statements, on February 1, 1977.
The evidence submitted by the railroads was repeatedly criticized by the federal agencies participating in the investigation,32 and by the Commission itself in its final report.33 It did indicate, however, that the rates for movements of the listed recyclable materials were significantly higher than those for their virgin resource material counterparts.34 In many instances the rail[126]*126roads’ evidence revealed that the rates on recyclables were in excess of the national average,35 while corresponding rates on virgin materials were below compensatory levels36 Nevertheless, the Commission refused to conclude that the rate structures were unlawful based solely on the evidence of wide rate disparities. Instead, it determined that it would apply traditional rate-making criteria to determine the lawfulness of the rate structures on a product-by-product basis.37 Applying such criteria, it concluded that the rate structures on practically all of the recyclable materials were reasonable and that none of the rate structures were discriminatory. The articulated bases for these determinations varied slightly according to the product involved. Referring to the relative demand inelasticities of recyclable materials to freight rates, as shown by freight commodity statistics submitted by the railroads38 and demand elasticity studies39 employed in the environmental impact statement, the Commission found that the recent rate increases did not result in a decreased volume in the amount of recyclable traffic moved by the railroads. The Commission further found that several of the recyclable materials did not in fact compete with their virgin material counterparts for transportation purposes, and that shippers of recyclables were not competitively injured by current rate disparities. Based on these findings, supported by the conclusions of the accompanying environmental impact statement,40 the Commission issued the final order here under review, declining, ■ with few exceptions,41 to order any reductions in the applicable rates.
Three Commissioners dissented from the majority’s report, arguing that the Commission did not comply with its mandate under Section 204.42 According to the dissenting Commissioners, the majority unlawfully relieved the railroads of their burden of proof under Section 204 by failing to require the railroads to justify the rate structures based on the transportation characteristics of the products involved. Advancing similar as well as other related challenges to the Commission’s order,43 petitioners thereupon filed these petitions for review, in which the United States has joined in urging that the order be set aside.
II
Much of the controversy throughout this proceeding has centered on the appropriate [127]*127interpretation to be given to the Commission’s mandate under Section 204. We do not believe the interpretative issue is nearly as difficult as the array of conflicting and exceedingly elaborate positions presented by the parties would suggest.44 Rather, we believe the language, and particularly the legislative history and background, of Section 204 make easily discernible the Commission’s mandate in this investigation.
Section 204 was the result of several years of congressional study45 and consideration of the problems of the recycling industry as a whole and the freight rates applied to recyclable products in particular. Informed of the limited amount of recycling occurring throughout the nation, and concerned with what it regarded as a regulatory barrier to attainment of national environmental and agency goals associated with promotion of industrial recycling,46 Congress responded initially by including Section 603 within the Regional Rail Reorganization Act.47 This section directed the Commission to “adopt appropriate rules” to “eliminate discrimination against the shipment of recyclable materials in rate structures and in other Commission practices where such discrimination exists.”48 As has been interpreted elsewhere, Section 603 [128]*128was a clear “legislative recognition of discrimination in the existing railroad rate structures and a legislative direction to the commission to eliminate it.” 49
The Commission virtually ignored the statutory message contained in Section 603. Rather than instituting a broad investigation into the lawfulness of the rate structures, the Commission responded by promulgating redundant rules governing procedures for filing a complaint with the agency.50 Moreover, the Commission thereafter approved another series of general rate increases applicable to recyclables,51 thereby possibly exacerbating the discrimination Congress believed was firmly imbedded in the rate structures.
The Commission’s persistent refusal to investigate the rate structures, combined with its continued approval of rate increases applicable to recyclables, led representatives of the recycling industries to support a number of bills subsequently introduced in Congress.52 Like Section 603, these bills all revealed Congress’ dissatisfaction with the approach displayed by the Commission in its general revenue proceedings, and were aimed at eliminating rate structures which in Congress’ view impeded development of increased recycling. In addition to explicitly requiring the Commission to investigate the rate structures, they would have compelled the Commission to adopt a presumption of competition between recyclable and virgin materials for the purpose of its investigation,53 and to establish recyclable rates at the lowest lawful levels compatible with maintenance of adequate transportation service.54 Although some of these bills were vigorously opposed by the Commission and eventually died in committee, Section 204 was finally enacted by Congress as that section emerged from the bills comprising the Regulatory Reform Act.55
Section 204, we believe, did not differ materially by either its terms or its underlying purpose from the bills considered and rejected by Congress. Just as those bills did not purport to change or modify substantive standards relating to the lawfulness of rates,56 neither did Section 204. Congress used familiar language, having a long-settled meaning in transportation law, in proscribing “unreasonableness” and “unjust discrimination” in rate structures. It is apparent from the use of such established terms that Congress deemed traditional transportation policy criteria adequate pro[129]*129tection against rate structures which discouraged industrial use of recycled products.
At the same time, however, Section 204, like previous bills, was intended to ensure proper application by the Commission of established statutory standards. Thus, by reversing the rules governing complainants’ burden of proof, Section 204 both precluded the Commission from adopting the approach taken in its general revenue proceedings, whereby it approved disparate rate structures based on the railroads’ revenue needs, and required the railroads to justify fully the rate structures involved under established ratemaking standards.
In the order under review57 and before this court58 the Commission has urged that in applying traditional standards in this investigation it was unnecessary to require the railroads to adduce proof on all factors related to transportation of commodities, and that instead it was incumbent on the recycling industry to demonstrate by way of rebuttal those factors militating against the lawfulness of the rate structures. We believe the Commission’s position reveals a serious misapprehension of the significance of the statutory reversal of the burden of proof in Section 204. As previously noted,59 the burden-shifting procedure employed by the Commission in its general revenue proceedings is premised on the notion that once the railroads have demonstrated a need for additional revenues, most individual increases within the approved limit will be found just and lawful. The Commission approved the rate increases on recyclables subject to this procedure and its concomitant assumption in its general revenue proceedings. By reversing the burden of proof in this proceeding, however, Congress accomplished more than a mere change in the procedural format for presentation of evidence, suggested by the Commission. Specifically, it erected an evidentiary presumption against the lawfulness of the rate structures, thereby preventing the Commission from assuming, or otherwise deferring to, asserted revenue needs of the railroads in determining the lawfulness of the rates. Unlike general revenue proceedings, this investigation was to proceed from the premise that disparate rate structures were not justified by the revenue needs of the railroads, and were therefore only to be upheld where actually warranted after consideration of all of the transportation characteristics, including the competitive relationships and costs, of the materials involved.
This theme — that Congress firmly opposed disparate rates maintained by the Commission to protect the railroads’ general revenue needs without complete consideration of the transportation characteristics of these products — is clearly revealed by both of the relevant portions of the legislative history of Section 204, the Senate Commerce Committee Report60 and the remarks made on the floor of the Senate.61 Thus, in view of the provisions of Section 204, its legislative history, and the background of congressional concern surrounding its enactment, we have no doubt that the Commission’s mandate in this investigation was to identify and remove disparities in the rate structures based on an in-depth examination of the transportation characteristics involved. The Commission, in the view of the proponents of Section 204, had erected barriers to industrial recycling by approving rate increases under the limited criteria applied in its general revenue proceedings. [130]*130Under Section 204 it was up to the Commission to eliminate these barriers, after a complete investigation of the rate structures in this proceeding.
Moreover, we reject the view 62 that Congress in some manner defeated the purpose of this investigation by its inclusion of Section 204 within the framework of the Regulatory Reform Act. As we have recently observed, this Act was not only a legislative enactment designed “to restore the financial stability of our railway system and promote its revitalization,” but was also an expression of congressional concern “that the interests of the railroads be balanced with the needs of shippers and the public.” 63 Section 204, dealing with an area of importance to the nation’s environment, struck the balance Congress deemed appropriate after its consideration of the interests involved. In so doing Congress tilted the scales against existing rate structures fostered by the Commission in its general revenue proceedings. It was not for the Commission to disagree with this legislative judgment by giving greater weight to concerns for railroad profitability than to the environmental and energy goals underlying the investigation.
Ill
We agree with the dissenting Commissioners that on this record the Commission’s approval of the rate structures was not consistent with its mandate. The challenged. order does not meaningfully address the focal question presented by its investigation, namely whether the substantial rate disparities between recyclable and virgin products are justified, in whole or in part, by the transportation characteristics of the products involved. The Commission, by finessing this and other questions,64 effectively relieved the railroads of their burden of proof under Section 204.
Even reviewing the Commission’s order on its own terms, we also find that several of its underlying findings and conclusions are inadequately supported and arbitrary. Applying a standard of competition which was both unduly narrow and inconsistent with its Section 204 mandate, the Commission again found that recyclable and virgin products do not compete for transportation purposes. These findings, based more on the Commission’s perceptions of industry structures than on articulated determinations with respect to rate structures, neither comport with the Commission’s mandate nor rationally flow from the record before us. Since the Commission was required in this proceeding to supply a reasoned decision with respect to two issues— whether the rate structures were shown to be reasonable and whether they were shown to be not unjustly discriminatory— we shall discuss the Commission’s determinations on each of these aspects separately.
[131]*131A. Reasonableness Issues
The Commission determined that in ascertaining the reasonableness of the rate structures it would not consider the rates on recyclables to be unreasonable unless they had resulted in a diminished volume of traffic during past years, or unless it appeared that recyclable materials could not absorb current rates.65 It applied no other standard of reasonableness66 and offered no explanation for its decision to focus exclusively on these criteria. Moreover, despite evidence of unusually high rate structures, the Commission refused to articulate a standard of maximum reasonableness for recycled products, stressing instead the need to consider in all instances the “public interest in a viable and efficient railroad industry”67 and “the maintenance of adequate revenue levels for the railroads”68 in determining the reasonableness of the rate structures.
As we have stated, the Commission was clearly authorized by Section 204 to apply traditional ratemaking criteria in this investigation. And we recognize that among such criteria the Commission normally is entitled to consider as one factor the effect of rates in terms of the volume of traffic moved. In view of-the Commission’s mandate in this proceeding and the evidence before it, however, we do not believe its decision to focus exclusively on this factor constituted an application of “satisfactory” 69 or proper and legal standards.70
The most salient theme that stands out in the legislative history of Section 204 is that Congress did not regard the existing rates on recyclables to be lawful solely because these materials could withstand rate increases and continue to move by rail. Congress, as we have seen, was concerned with rate barriers to increased levels of recycling, as well as with the maintenance of existing ones. It believed, based on the data and information before it, that removal of unreasonableness (and discrimination) in rate structures would serve to promote an increase in the amount of industrial recycling, consistent with its environmental and energy goals. By applying, as an exclusive legal standard in this investigation, one which was designed to insure only maintenance of the status quo in the volume of recyclable traffic, and not one capable of measuring the effect of rate structures in terms of promotion of industrial recycling, the Commission thwarted the purpose of this investigation.
It is true that the freight commodity statistics submitted by the railroads and the elasticity studies relied upon by the Commission indicated that the volume of traffic for most recyclables did not decrease in response to previous rate increases. Such evidence, while probative, was hardly conclusive on the question whether the rate structures were impeding development of increased recycling71 The probative value [132]*132of both types of evidence, moreover, rests entirely on their shared assumption that the rate structures themselves are not unreasonable or unjustly discriminatory.72 The clear purpose of this investigation, however, was to test the validity of this underlying assumption, one upon which the Commission has been operating for years, not summarily to adopt it. Neither the standard applied by the Commission nor the evidence before it, therefore, was adequate to enable it to conclude, consistent with its mandate, that these rate structures were reasonable.
Other deficiencies in the evidence relied upon by the Commission also lead us to conclude that its determinations on these issues are inadequately supported and arbitrary. As the Commission itself acknowledged,73 a great void exists in this record due to the absence of any evidence concerning the effect of the rate structures on intermodal competition. Given the substantial disparities in the rates applicable to these products, such evidence may well have been material in determining the reasonableness of the rate structures. It may be, for example, that greater equality in the rates would result in diversion of traffic for some or all of these products to competing modes. We need not consider the question whether evidence showing that lower rates on recyclables or higher rates on virgin products would endanger the railroads’ ability to carry the traffic might have been sufficient to permit the Commission to approve these rate structures, for we believe the question is one that required an initial determination by the Commission. On the present record, however, there is no basis to enable either this court or the Commission to make an informed determination on the matter.
Beyond this inadequacy in the record, we note that the heavy, and often impressionistic, weight74 given by the Commission to the elasticity studies in this proceeding, was plainly unwarranted. The Commission itself admitted the inherent limitation of such studies when used to determine the lawfulness of rate structures.75 Moreover, its findings in a recent report prepared pursuant to Section 202 of the Regulatory Reform Act76 to the effect that practically all commodities are demand inelastic to [133]*133freight rate structures indicate that such studies may have no special significance with respect to the rate structures on recyclable products. We need not, and thus do not, question the validity of the Commission’s elasticity studies77 in order to observe that its approval of the rate structures, based in several instances solely on the results of these studies, was arbitrary in light of their admitted limitations and the findings of this report.
Finally, we stress that the Commission was not permitted in this investigation to maintain high rates on recyclables based on general assertions by the railroads concerning the profitability of recyclable traffic and their needs for additional revenues. While we agree with the Commission that it was not required by Section 204 to establish a maximum reasonableness standard applicable to all recycled products, we have no doubt that it was prohibited from approving rate structures unless they were shown to be justified by the transportation characteristics of the particular products. To us, this means that the Commission was compelled by Section 204 to scrutinize the railroads’ cost justifications for current rate levels, and that it was insufficient to conclude that the rates were reasonable merely because these levels were profitable for the railroads or because recyclable traffic would continue to move by rail at the railroads’ current revenue levels. It may be that, having examined fully the transportation characteristics of the products involved, the Commission might have determined to fix a maximum reasonableness standard for recycled products. And in measuring the appropriate standard the Commission might even have allowed for a reasonable margin of profitability under the rate structures. It is not for us to determine at this stage whether this course, if pursued, would have been proper, or precisely how a maximum reasonableness standard should be measured78 since, owing to [134]*134the Commission’s failure to require proof on the transportation characteristics of these products, there is no basis in the record for these determinations. We leave these and the other questions alluded to for resolution by the Commission upon remand.
B. Discrimination Issues
The Commission stated that in determining whether the rate structures were unjustly discriminatory it would be guided by its “traditional standards” under Section 3(1) of the Interstate Commerce Act,79 and would therefore conduct a four-step analysis. The four steps listed by the Commission were: (1) whether disparities exist between the ratios for recyclable and virgin materials; (2) whether there is “in fact” competition between these materials; (3) whether shippers of recyclables are being injured by the rate disparities; and (4) whether rate disparities are justified by differences in the transportation characteristics of the materials involved.80 Applying these standards, it concluded that most of the recyclable materials did not in fact compete with their virgin material counterparts, and that shippers of all of the recyclable materials were not competitively injured by existing rate structures. As it had in addressing the issue of the reasonableness of the rate structures, the Commission again avoided an examination of the transportation characteristics of the various products, in this instance by concluding its analysis at the third of these criteria.
We agree with the Commission’s initial determination to consider the discrimination issues within the framework of the broad prohibitions provided by Section 3(1).81 Moreover, we concur in the Commis[135]*135sion’s view that resolution of the discrimination issues in this proceeding required it to consider carefully the competitive relationships between the materials involved. We hold, however, that on this record the Commission’s findings of no competition in fact, and no actual competitive injury, were inconsistent with its mandate.
Turning first to the Commission’s findings of no competition, we note that an obvious concern of Congress in enacting Section 204 was to ensure that the Commission take into account the full competitive relationships between recyclable and virgin commodities. In its general revenue proceedings the Commission had rejected challenges to rate increases, concluding consistently that recyclable and virgin products did not compete for transportation purposes because their competitive relationships were complementary. As in this proceeding, therefore, the Commission applied a standard of competition requiring a showing that recyclable products were substitutable for, rather than functionally equivalent with, virgin products in the manufacture of industrial products. In the view of some members of Congress this standard was unduly narrow and its application by the Commission had resulted in approval of freight rates which retarded rather than promoted industrial use of recycled products. The pertinent passages of the legislative history of Section 20482 suggest further that these proponents believed application of this standard would frustrate the purpose of the investigation required by the statute.
Although the competition standard employed by the Commission was thus an important area of congressional concern, it is evident from both the language of the statute and its remaining legislative history that it was not the main concern leading Congress to require this investigation. As we have previously stated, Congress’ major concern was with removal of rate structures which impeded or discouraged development of industrial recycling. In light of this dominant purpose, and especially due to the absence of any statutory reference to the standard of competition to be applied, we are unable to conclude that Section 204 was a legislative directive to the Commission to make positive findings that these products compete for transportation purposes. Nor may we conclude that Congress meant to prescribe any particular standard of competition for application in this investigation. While, as indicated previously, some of the proponents of Section 204 believed that the Commission’s investigation should proceed with a presumptive standard of competition based on the functional equivalency of the products in manufacturing processes, Section 204, by its terms, did not enact such a standard.83
[136]*136At the same time, giving effect to the specific mandate of Section 204 — that the Commission order removal of unlawful rate structures found to discourage industrial recycling after a broad investigation — we believe that the Commission was not entitled to apply a competition standard so narrow in scope as to obviate the statutory purpose of its investigation. The lawfulness of the rate structures was not to be governed by the fact that recyclable products had been unable to attain actual competitive status with virgin products under existing rates. Instead, we believe that to warrant dispositive findings of no competition the Commission was required to find that the various products were neither actually nor potentially competitive for transportation purposes. The Commission was therefore required to consider the potential under the rate structures for competitive relationships between recyclable and virgin products, and for competitive injury to shippers. This standard, we might add, not only comports with the Commission’s mandate, but is fully consistent with competition standards traditionally applied by the Commission in other discrimination cases.84
When measured against this standard, the Commission’s findings of no competition cannot be sustained. The Commission uniformly required a showing of competition “in fact” to establish discrimination, and concluded in each instance that the recyclable and virgin material counterparts were noncompetitive because they were not actually substitutable in manufacturing processes.85 It made no findings, and was offered no evidence by the railroads, to the effect that the recyclable materials were not potentially competitive in manufacturing processes, in terms of either their substitutability or their functional equivalency. As we have indicated, it was patently insufficient for the Commission to approve rate structures on recyclables without consideration of such evidence, for to do so was to contravene its mandate in this proceeding.
It follows from our discussion that the Commission’s alternative findings of no competitive injury also may not be sustained. Based on the same evidence relied upon in determining the reasonableness of the rate structures,86 the Commission invariably concluded that shippers of recyclables had not suffered actual injury as a result of disparate rate treatment. That evidence, as we have seen, does not support a finding that the rate structures do not present a potential for competitive harm to shippers of recyclables. Instead, it only reflects the responsiveness of the relatively small amount of recyclables shipped to the recent rate increases approved by the Commission. It does not measure the effects of the rate structures on recyclable traffic. Nor does it account for increases in recyclable traffic that may have occurred absent the effects of the rate structures.
Unable to discern from this record any support for the Commission’s findings on the discrimination issues, we set them aside, leaving for the Commission’s determination such questions as may be involved in the assessment of the potential competition and competitive injury presented by these rate structures.87 Recognizing the breadth of the competition standard the Commission [137]*137will be required to apply, however, we note that only extraordinary circumstances, not disclosed by this record, will warrant another effort by the Commission which omits consideration, under a Section 3(1) analysis, of the issue whether disparities in the rate structures are justified by differences in the transportation characteristics of these products.
IV
Before concluding, we stress that we are unimpressed with the Commission’s attempt to excuse its failure to comply with its mandate by repeated reference to the expedited nature of this investigation. The Commission has for a long time promised, and was finally compelled by Section 204, to resolve the longstanding controversy related to these rate structures. In light of the Commission’s general familiarity with the issues involved, and the fact that a significant portion of the extensive record compiled consists of incorporated matter predating its investigation, the proffered excuse is untenable. This is not a case where an agency’s determinations are or should be accorded an unusual degree of deference by a reviewing court because of the novelty of the issues and the time constraints within which the agency must operate.88
On the other hand, although we disagree with the Commission’s actions on this record, we also emphasize that our discussion of the standards employed by the Commission to determine the lawfulness of these rate structures, and of the evidence submitted by the railroads, is not intended to set forth our view of the lawfulness of any of the rate structures involved. They may be lawful, or they may not. In either event, it was for the Commission to decide initially based on an adequately supported consideration of the transportation characteristics of the products consistent with its mandate. We have concluded only that the Commission has not done so in this case.
Nor, by our disposition, do we mean to intimate any view on the several contentions advanced relating to the measures the Commission should adopt in proscribing either maximum rates on recyclables or maximum rate disparities between recyclable and virgin products. All of these questions we leave to the informed judgment of the Commission, after full consideration of the railroads’ justifications for disparities in the rate structures and the effect of the rate structures in terms of their actual and potential impact on the use of recycled products.
With these closing admonitions, we conclude that the Commission has not reasonably adhered to its mandate in this proceeding. Accordingly, we vacate the order under review in Nos. 77-1187 and 77-1292 in its entirety, and remand the case for further proceedings consistent with this opinion. We also dismiss the petition for review in No. 77-1193.89
So ordered.
APPENDIX A
Section 204 of the Railroad Revitalization and Regulatory Reform Act of 1976, P.L. 94-210, 45 U.S.C. § 793 note, provides:
INVESTIGATION OF DISCRIMINATORY FREIGHT RATES FOR THE TRANSPORTATION OF RECYCLABLE OR RECYCLED MATERIALS
Sec. 204. (a) Investigation. — The Commission, within 12 months after the date of enactment of this Act, and thereafter as appropriate, shall—
(1) conduct an investigation of (A) the rate structure for the transportation, by common carriers by railroad subject to part I of the Interstate Commerce Act, of recyclable or recycled materials and competing virgin natural resource materials, and (B) the manner [138]*138in which such rate structure has been affected by successive general rate increases approved by the Commission for such common carriers by railroad;
(2) determine, after a public hearing during which the burden of proof shall be upon such common carriers by railroad to show that such rate structure, as effected by rate increases applicable to the transportation of such competing materials, is just, reasonable, and nondiscriminatory, whether such rate structure is, in whole or in part, unjustly discriminatory or unreasonable;
(3) issue, in all cases in which such transportation rate structure is determined to be, in whole or in part, unjustly discriminatory or unreasonable, orders requiring the removal from such rate structure of such unreasonableness or unjust discrimination; and
(4) report to the President and the Congress, in the annual report of the Commission for each of the 3 years following the date of enactment of this Act, and in such other reports as may be appropriate, all actions commenced or completed under this section to eliminate unreasonable and unjustly discriminatory rates for the transportation of recyclable or recycled materials.
(b) Participation. — The Administrator of the Environmental Protection Agency shall take such steps as are necessary to assure that the Commission carries out the requirements set forth in subsection (a) of this section as expeditiously as possible. Such Administrator is authorized to participate as a party in the investigation to be commenced by the Commission under such subsection (a).
(c) Research, Development, and Demonstration. — The Secretary, in cooperation with the Commission, shall establish a research, development, and demonstration program to develop and improve transport terminal operations, transport service characteristics, transport equipment, and collection and processing methods for the purpose of facilitating the competitive and efficient transportation of recyclable or recycled materials by common carriers by railroad subject to part I of the Interstate Commerce Act.
(d) Review. — Orders issued by the Commission pursuant to this section shall be subject to judicial review or enforcement in the same manner as other orders issued by the Commission under the Interstate Commerce Act. In all proceedings under this section, the Commission shall comply fully with the requirements of the National Environmental Policy Act of 1969 (42 U.S.C. § 4321 et seq.).
(e) Definitions. — As used in this section, the term—
(1) “recyclable material” means any material which has been collected or recovered from waste for a commercial or industrial use, whether or not such collection or recovery follows end usage as a product; and
(2) “virgin natural resource material” and “virgin material” mean any raw material, including previously unused metal or metal ore, woodpulp or pulpwood, textile fiber or material, or other resource which is, or which will become (through the application of technology), a source of raw material for commercial or industrial use.
Before WRIGHT, Chief Judge, and SWYGERT* and LEVENTHAL, Circuit Judges.