FERGUSON, Circuit Judge:
The plaintiffs, California rail lines and railroad car companies (“railroads”), appeal from the district court’s dismissal of their challenge to the valuation of their rail transportation property by the defendant, the California Board of Equalization. The valuation challenge constitutes one phase of a multiphase trial in which the railroads claim discriminatory state taxation in violation of the Railroad Revitalization and Regulatory Reform Act of 1976,1 49 U.S.C. § 11503 (“4-R Act”).
The district court dismissed the valuation challenge for lack of jurisdiction, finding that the railroads were not entitled to relief under the 4-R Act. Trailer Train Co. v. State Board of Equalization, No. CV-81-4365-SW (N.D.Cal. June 22, 1984). We find that a valuation challenge states a claim under the 4-R Act, and we reverse with instructions to abstain from consideration of the railroads’ valuation challenge pending finality of prior state court actions involving the merits of the valuation issue under California law.
I.
In 1976, Congress passed the 4-R Act to provide railroads with some protection from the common state practice of discrimi-natorily taxing rail transportation property. The 4-R Act, 49 U.S.C. § 11503, prohibits a state from applying a higher ratio of assessed value to true market value for railroads than the ratio of assessed value to true market value for other commercial and industrial property in the same assessment jurisdiction.2 Id. § 11503(b)(1). Sec-
[1444]*1444tion 11503(c) confers jurisdiction on the United States district courts to grant in-junctive relief if the ratio of assessed to true market value for railroads exceeds the ratio of assessed to true market value for other commercial and industrial property by at least five percent. Id. § 11503(b)(1).
The California Board of Equalization issues an annual property tax on all commercial and industrial property, real and personal, in the state. The Board uses a complex scheme to calculate the tax for all commercial and industrial property. First, the Board determines the true market value of each company’s property. See Cal. Rev. & Tax. Code §§ 110, 401.3 The Board then “assesses” the taxable property at its full market value,4 Cal.Rev. '& Tax.Code § 401, and applies the tax rate to the assessed amount to determine the tax due. Taxpayers are entitled to administrative and judicial review of the Board’s valuation of assessed properties. See id. §§ 741-758, 4808, 5096, 5140-5152; Cal. Admin.Code 18 §§ 904-916.5
This action arose from the Board’s valuation and assessment of railway property for the tax years 1975 through 1983. The railroads complied with the administrative review procedures and then, between 1978 and 1984, filed several refund actions in state courts.6 Each action alleged that the Board overvalued the rail transportation property. At the time this action was filed, three of the state court actions had been tried (Southern Pacific (No. 3 Civ. 23555), Trailer Train, and Atchison). Two, decided in favor of the Board, were before the California Court of Appeal (Southern Pacific (No. 3 Civ. 23555) and Trailer Train). The remaining cases were pending before the trial court.
The plaintiffs filed actions in federal district court between 1981 and 1983, alleging discriminatory taxation in violation of the 4-R Act. The suits challenged the Board’s valuations and methodology for the same [1445]*1445years that are at issue in the state courts. The district court consolidated the actions7 and, in June 1983, divided the trial into three phases. Phase I, tried in 1984, attacked the Board’s valuation methodology and alleged that it produced a ratio of assessed value to true market value for rail transportation property higher than the ratio of assessed value to true market value for other commercial and industrial property in California.8 In Phase II, the subject of this appeal, the railroads attack the Board’s valuation itself and therefore seek a redetermination of the true market value for their properties. Phase III, which is to cover any remaining issues, is still in the district court.
At the conclusion of Phase I, the Board moved to dismiss Phase II, arguing that the 4-R Act does not allow relief for the valuation challenge. The railroads claimed that the true market value calculated by the Board was higher than the real true market value and therefore they paid higher taxes proportionately than other commercial and industrial property owners. The railroads argued that section 11503 provided a remedy for discrimination that results from overvaluation of rail transportation property, caused by generally not applying the methodology correctly or by negligently or intentionally inflating figures.
After a hearing on the motion, the district court dismissed plaintiffs’ valuation claims. The court concluded that section 11503 allowed it only to evaluate the methodology and to equalize the ratio of assessed value to true market value of railroad properties with the ratio of assessed value to true market value of other commercial and industrial property. This inquiry had been the subject of Phase I. The district court certified its order of dismissal under 28 U.S.C. § 1292(b) as an appealable interlocutory order. This court granted the railroads’ petitions for permission to appeal.
II.
We conclude that the district court erred in holding that the railroads’ valuation challenge was outside the scope of the 4-R Act. The 4-R Act gives federal district courts the power to enjoin certain discriminatory state taxation practices, 49 U.S.C. § 11503(c). Section 11503 specifically refers to the “true market value” of rail property and identifies that factor as an integral element of the statutory test for discriminatory taxation. The normal presumption is that true market value — like all factual issues bearing on a claimed statutory violation — would be open to dispute and proof before a federal court hearing a 4-R Act claim. Therefore, the' statute confers federal jurisdiction to hear challenges to the state’s calculation of the railroad property’s true market value.
This conclusion is supported by two specific references to “true market value” in this section. First, section 11503(c) expressly provides that the “burden of proof with respect to the determination of assessed value and true market value shall be that declared by applicable State law.” This reference clearly indicates Congress’s intention that the question of true market value would be subject to litigation in cases under the Act. Second, the statute sets forth a specific method of proof for establishing the market value of commercial and industrial property. See 49 U.S.C. § 11503(c).
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FERGUSON, Circuit Judge:
The plaintiffs, California rail lines and railroad car companies (“railroads”), appeal from the district court’s dismissal of their challenge to the valuation of their rail transportation property by the defendant, the California Board of Equalization. The valuation challenge constitutes one phase of a multiphase trial in which the railroads claim discriminatory state taxation in violation of the Railroad Revitalization and Regulatory Reform Act of 1976,1 49 U.S.C. § 11503 (“4-R Act”).
The district court dismissed the valuation challenge for lack of jurisdiction, finding that the railroads were not entitled to relief under the 4-R Act. Trailer Train Co. v. State Board of Equalization, No. CV-81-4365-SW (N.D.Cal. June 22, 1984). We find that a valuation challenge states a claim under the 4-R Act, and we reverse with instructions to abstain from consideration of the railroads’ valuation challenge pending finality of prior state court actions involving the merits of the valuation issue under California law.
I.
In 1976, Congress passed the 4-R Act to provide railroads with some protection from the common state practice of discrimi-natorily taxing rail transportation property. The 4-R Act, 49 U.S.C. § 11503, prohibits a state from applying a higher ratio of assessed value to true market value for railroads than the ratio of assessed value to true market value for other commercial and industrial property in the same assessment jurisdiction.2 Id. § 11503(b)(1). Sec-
[1444]*1444tion 11503(c) confers jurisdiction on the United States district courts to grant in-junctive relief if the ratio of assessed to true market value for railroads exceeds the ratio of assessed to true market value for other commercial and industrial property by at least five percent. Id. § 11503(b)(1).
The California Board of Equalization issues an annual property tax on all commercial and industrial property, real and personal, in the state. The Board uses a complex scheme to calculate the tax for all commercial and industrial property. First, the Board determines the true market value of each company’s property. See Cal. Rev. & Tax. Code §§ 110, 401.3 The Board then “assesses” the taxable property at its full market value,4 Cal.Rev. '& Tax.Code § 401, and applies the tax rate to the assessed amount to determine the tax due. Taxpayers are entitled to administrative and judicial review of the Board’s valuation of assessed properties. See id. §§ 741-758, 4808, 5096, 5140-5152; Cal. Admin.Code 18 §§ 904-916.5
This action arose from the Board’s valuation and assessment of railway property for the tax years 1975 through 1983. The railroads complied with the administrative review procedures and then, between 1978 and 1984, filed several refund actions in state courts.6 Each action alleged that the Board overvalued the rail transportation property. At the time this action was filed, three of the state court actions had been tried (Southern Pacific (No. 3 Civ. 23555), Trailer Train, and Atchison). Two, decided in favor of the Board, were before the California Court of Appeal (Southern Pacific (No. 3 Civ. 23555) and Trailer Train). The remaining cases were pending before the trial court.
The plaintiffs filed actions in federal district court between 1981 and 1983, alleging discriminatory taxation in violation of the 4-R Act. The suits challenged the Board’s valuations and methodology for the same [1445]*1445years that are at issue in the state courts. The district court consolidated the actions7 and, in June 1983, divided the trial into three phases. Phase I, tried in 1984, attacked the Board’s valuation methodology and alleged that it produced a ratio of assessed value to true market value for rail transportation property higher than the ratio of assessed value to true market value for other commercial and industrial property in California.8 In Phase II, the subject of this appeal, the railroads attack the Board’s valuation itself and therefore seek a redetermination of the true market value for their properties. Phase III, which is to cover any remaining issues, is still in the district court.
At the conclusion of Phase I, the Board moved to dismiss Phase II, arguing that the 4-R Act does not allow relief for the valuation challenge. The railroads claimed that the true market value calculated by the Board was higher than the real true market value and therefore they paid higher taxes proportionately than other commercial and industrial property owners. The railroads argued that section 11503 provided a remedy for discrimination that results from overvaluation of rail transportation property, caused by generally not applying the methodology correctly or by negligently or intentionally inflating figures.
After a hearing on the motion, the district court dismissed plaintiffs’ valuation claims. The court concluded that section 11503 allowed it only to evaluate the methodology and to equalize the ratio of assessed value to true market value of railroad properties with the ratio of assessed value to true market value of other commercial and industrial property. This inquiry had been the subject of Phase I. The district court certified its order of dismissal under 28 U.S.C. § 1292(b) as an appealable interlocutory order. This court granted the railroads’ petitions for permission to appeal.
II.
We conclude that the district court erred in holding that the railroads’ valuation challenge was outside the scope of the 4-R Act. The 4-R Act gives federal district courts the power to enjoin certain discriminatory state taxation practices, 49 U.S.C. § 11503(c). Section 11503 specifically refers to the “true market value” of rail property and identifies that factor as an integral element of the statutory test for discriminatory taxation. The normal presumption is that true market value — like all factual issues bearing on a claimed statutory violation — would be open to dispute and proof before a federal court hearing a 4-R Act claim. Therefore, the' statute confers federal jurisdiction to hear challenges to the state’s calculation of the railroad property’s true market value.
This conclusion is supported by two specific references to “true market value” in this section. First, section 11503(c) expressly provides that the “burden of proof with respect to the determination of assessed value and true market value shall be that declared by applicable State law.” This reference clearly indicates Congress’s intention that the question of true market value would be subject to litigation in cases under the Act. Second, the statute sets forth a specific method of proof for establishing the market value of commercial and industrial property. See 49 U.S.C. § 11503(c).
We do not believe that Congress’ failure to address specifically the method of proof in rail transportation property valuations precludes a federal court from determining the market value of rail transportation property in an appropriate case. Instead, Congress more probably recognized the dif[1446]*1446ference between calculating a “true market value” for a specific taxpayer and for an entire industry. The former determination involves only one property; the latter involves “all other commercial and industrial property.” In order to indicate that an averaging method of some sort was acceptable for determining “true market value,” Congress specifically approved one method of such proof. There was no need to specify an acceptable method of proof for the true market value for the individual litigant’s rail transportation properties.
The purposes of the 4-R Act also support the power of the district court to hear the valuation claim involved here. Congress enacted the statute to end. what it perceived to be the pervasive and longstanding practice of discriminatory taxation of railroads. Given the important remedial objective of the legislation, it is implausible to assert that the Act was not intended to provide relief from every form of de facto discrimination. Such a holding would frustrate the purposes of the statute and lead to irrational consequences.
Indeed, the only circuit to consider a claim of overvaluation recognized that such claims were cognizable under the Act, albeit only if a certain threshold showing was made. See Burlington Northern R. Co. v. Lennen, 715 F.2d 494, 498 (10th Cir.1983) (holding that railroad could prevail on an overvaluation claim in federal courts provided it “can make a strong showing of a purposeful overvaluation of a particular railroad’s property with discriminatory intent”), cert. denied, 467 U.S. 1230, 104 S.Ct. 2690, 81 L.Ed.2d 884 (1984). We decline to adopt the Tenth Circuit’s threshold requirement; however, we agree that federal courts have jurisdiction over claims of rail property overvaluation.
We therefore hold that the 4-R Act authorizes federal district courts to hear claims of . specific instances of overvaluation in state tax assessment of the true market value of rail transportation property.
III.
Although the district court has the power to hear the railroad’s Phase II claim, we conclude that the district court should abstain from considering whether the state’s true market value figure is correct until the state itself has made such a determination. In doing so, we examine the larger relationship between the federal courts and state taxation.
The 4-R Act represents an exception to the federal government’s reluctance to interfere with states’ administration of their tax laws. The general policy, codified in the Tax Injunction Act, 28 U.S.C. § 1341, prohibits federal courts from enjoining the assessment, levy, or collection of any state or local tax when an adequate remedy is available in state courts. The Tax Injunction Act “reflect[s] the fundamental principle of comity between federal courts and state governments that is essential to ‘Our Federalism,’ ” Fair Assessment in Real Estate Association v. McNary, 454 U.S. 100, 103, 102 S.Ct. 177, 179, 70 L.Ed.2d 271 (1981), and recognizes “the imperative need of a State to administer its own fiscal operations.” Tully v. Griffin, Inc., 429 U.S. 68, 73, 97 S.Ct. 219, 222, 50 L.Ed.2d 227 (1976).
Congress intended the 4-R Act to be a narrow and unintrusive exception for railroads to the Tax Injunction Act. See S.Rep.No. 1483, 90th Cong., 2d Sess. 10-12 (1968). An overly broad construction of section 11503(c) “would impose significant burdens on district courts,” forcing them to sit as state tax assessment boards for rail transportation property “and would substantially thwart the tax collection process of states and their subdivisions.” Burlington Northern Railroad Co. v. Lennen, 715 F.2d 494, 498 (10th Cir.1983).
Moreover, although section 11503 is an exception to the Tax Injunction Act, it is not an exception to general principles of abstention. See McNary, 454 U.S. at 105, 109, 102 S.Ct. at 180, 182-83 (holding that 42 U.S.C. § 1983 was an exception to the Tax Injunction Act, but abstention princi-[1447]*1447pies still applied so long as the federal claims involved were adequately protected). The railroads attacked the same valuations in state courts as they do here. California, with all of its timeliness requirements and levels of administrative and judicial review, provides adequate protection for any claims the railroads have of discrimination because of overvaluation. Their remedies in state court are plain, adequate, and complete. Id.
With these concerns in mind, we address whether the district court properly dismissed the valuation claims. We conclude that the district court should have found jurisdiction but abstained from resolving the merits of the state valuation question, and therefore should have stayed consideration of the railroads’ valuation challenge under the 4-R Act9 until the state courts resolve the valuation-issue.
Abstention from deciding the valuation claim is appropriate under Colorado River Water Conservation District v. United States, 424 U.S. 800, 96 S.Ct. 1236, 47 L.Ed.2d 483 (1976). When related proceedings are pending in state court at the time a case is filed in federal court, the federal court considers several factors to determine if abstention is appropriate: the amount of activity in the district court involving the issue in the state court actions; the nature of the issue and the effect on the case if the state court reaches a judgment; the convenience of the parties; the federal interests weighed against the state interests; and the desirability of avoiding piecemeal litigation. Moses H. Cone Memorial Hospital v. Mercury Construction Corp., 460 U.S. 1, 16, 103 S.Ct. 927, 937, 74 L.Ed.2d 765 (1983); Colorado River, 424 U.S. at 818, 96 S.Ct. at 1246-47. The federal court also considers whether state or federal law provides the rule of decision on the merits, Moses H. Cone, 460 U.S. at 23-26, 103 S.Ct. at 941-42, and the probable adequacy of the state court proceedings in protecting the parties’ rights, id. at 26-27, 103 S.Ct. at 942-43.
. Colorado River abstention is appropriate in this case. First, there was no activity in the district court involving the merits of the valuation challenge, which is the issue in the state court actions.10 By contrast, the state proceedings were advanced at that time: out of the several cases , filed, three had come to judgment, two were on appeal, and the rest were in various stages of discovery. Second, the nature of the issue is state taxation, and the effect on this case of a state court decision would be substantial. Property taxation is of special interest to states, as discussed supra. If the state courts decide in favor of the railroads and grant them refunds, this suit will become moot. If the state courts decide the valuation issue, Phase II becomes unnecessary because railroads will be collaterally estopped from asserting the valuation issue. Third, the convenience of the parties does not weigh in favor of or against abstention. Colorado River was concerned mainly with geographic convenience, and here neither forum is more convenient than the other. Fourth, the state interests outweigh the federal interests in this case. The state has a strong interest in ensuring that its officials fairly and accurately assess and valúate property, in enforcing compliance by state officials with the state’s laws, and in ensuring that railroads pay their fair share of taxes. The federal interest is the same as the first state interest noted above: ensuring that state officials fairly and accurately assess [1448]*1448and valúate property. Although this interest is strong, the state’s corresponding interest is equally strong, and the state has the additional interests mentioned above. Thus, we conclude that the state interests outweigh the federal interests in this case.
In addition, state law provides the law of decision in the present case. Although the case involves interpretation of a federal statute, the merits of the Phase II portion of the trial deal only with the factual question of true market value, which the Act itself clearly implies is to be determined according to state law. See 49 U.S.C. § 11503(c) (“The burden of proof in determining assessed value and true market value is governed by State law.”). Phase I of the trial determined that the state’s valuation methodology was not discriminatory and did not violate the Act, and that determination is not involved in this appeal.
Finally, state courts are capable of protecting the railroad’s rights under the Act. Unlike the situation in Moses H. Cone, in which there was serious doubt whether the state court even had the power to compel the arbitration sought by the plaintiff, 460 U.S. at 26-27, there is no doubt here that the state court has the power to grant the relief the railroad seeks, a determination of the true market value of its property.
The Ninth Circuit recently applied Colorado River abstention principles to another area of state concern, oil interests. Mobil Oil Corp. v. City of Long Beach, 772 F.2d 534, 541-42 (9th Cir.1985). Mobil Oil Corp. reaffirmed that Colorado River abstention is appropriate if there is ongoing state litigation filed substantially before the case in federal court, id., if failing to abstain would result in piecemeal litigation, id., if no “substantial progress” were made in the federal court, id., and if the state is a party acting as sovereign rather than in its proprietary capacity, id. at 542. The factors in that case weighed against abstention, and the panel reversed the district court’s decision to abstain.
Mobil Oil also distinguished Shell Oil Co. v. Frusetta, 290 F.2d 689 (9th Cir.1961), in which we upheld dismissal of a declaratory judgment action regarding plaintiffs’ ownership interests in lands leased to Shell Oil. Shell Oil did not use the term “abstention,” but addressed the same concerns. The court dismissed because the plaintiffs had filed actions in state court three years earlier requesting adjudication of the same issues. Mobil Oil states that Colorado River restricted Shell Oil, but did not overrule it. Shell Oil still applies to cases in which, as here, the parties initiated the state litigation years before any federal suit, and in which dual litigation on the issue would “fragment the case.” Mobil Oil, 772 F.2d at 541-42.
We recognize that Congress intended the 4-R Act to provide a federal remedy for discriminatory state taxation of railroad property. In the present case, the railroads chose their own forum; they elected to file an action in state court first, rather than challenging the administrative assessment action in federal court in the first instance. Our analysis might be different under a different state assessment structure, or if the railroads did not have the initial choice of forum. Here, however, the railroads cannot be heard to complain if a federal court defers to a state court in which the railroads themselves first sought relief.
Although the district court should abstain from deciding the merits of the valuation issue, it should retain jurisdiction but stay consideration of the federal question pending the outcome of the state actions. See Kollsman v. City of Los Angeles, 737 F.2d 830, 837 (9th Cir.1984) (finding it appropriate for the district court to retain jurisdiction while abstaining pending outcome of state court proceedings). Under Colorado River, Mobil Oil, and Shell Oil, discretionary abstention is appropriate until the state court determines the valuation issue. Once the state proceedings are concluded, the plaintiffs are free to resolve the remaining issues in federal court. The district court’s order to dismiss is REVERSED with instructions to abstain from the merits of the valuation issue, and to stay consideration of whether a valuation [1449]*1449challenge states a claim under 49 U.S.C. § 11503.