This case concerns an interlocutory appeal from a district court order granting Burlington Northern Railroad Company (BNRR) a preliminary injunction against Gerald D. Bair, Director of the Department of Revenue of Iowa. The injunction prohibits Bair and others from assessing, levying, or collecting certain Iowa property taxes. BNRR claims these actions violate section 306 of the Railroad Revitalization and Regulatory Reform (4-R) Act of 1976, Pub.L. No. 94-210, 90 Stat. 31, 54-55 (codified with some differences in language at 49 U.S.C. § 11503 (1988)). 1 Bair appeals, arguing, among other things, that the district court erred in deciding whether to grant the preliminary injunction by (1) applying a “reasonable cause" standard and (2) considering only BNRR’s evidence. We affirm in part, reverse in part, and remand for further proceedings.
I. BACKGROUND
On July 27, 1990, BNRR filed a complaint against Bair in federal court, seeking a permanent injunction pursuant to section 306 of the 4-R Act, 2 prohibiting Bair and others from collecting the second half of BNRR’s 1989 ad valorem taxes for Iowa. BNRR alleged that the taxes, which Bair levied on behalf of Iowa, violated section 306’s prohibition against discriminatory taxation of railroads. See 4-R Act § 306. The complaint only concerned the second half of BNRR’s 1989 taxes because Iowa permits taxpayers to pay ad valorem taxes in two installments and the parties already had entered into a consent injunction re *601 garding the first installment of BNRR’s 1989 taxes.
The second installment of BNRR’s 1989 ad valorem taxes was due on or before March 31, 1991. On February 13, 1991, BNRR moved for a preliminary injunction prohibiting collection of the taxes. The district court held a hearing to decide whether to grant BNRR’s motion. At the hearing, both BNRR and Bair supported their respective positions with briefs and affidavits. Because we decline to address any factual issues in this opinion, we need not review the specific contents of the various documents.
In deciding whether to grant the preliminary injunction, the district court made two important rulings. First, the court ruled that a “reasonable cause” standard, as opposed to traditional equitable principles,
3
governed the issuance of injunctions under section 306. The district court followed the Tenth Circuit’s opinion in
Atchison, T. & S.F. Ry. v. Lennen,
After reviewing BNRR’s evidence, the district court held that BNRR had presented sufficient facts which could reasonably support its position that the 1989 ad valo-rem taxes for Iowa violated section 306. The district court, therefore, granted BNRR’s motion for a preliminary injunction. For the reasons discussed below, we affirm the district court’s first ruling, but reverse its second one, and remand for a new hearing with directions to consider all the evidence presented by both parties.
II. DISCUSSION
We begin by noting that the district court’s decisions to apply a reasonable cause standard and to examine only BNRR’s evidence in determining whether to grant BNRR a preliminary injunction under section 306, concern the interpretation and application of a federal statute. As such, our review of the district court’s rulings is plenary. Stevenson v. Stevenson Assocs. (In re Stevenson Assocs., Inc.,), 777 F.2d 415, 418 (8th Cir.1985).
A. Reasonable Cause Standard
Bair’s initial claim on appeal is that the district court erred in applying a reasonable cause standard as opposed to traditional equitable principles in determining whether to grant BNRR an injunction under section 306. We disagree. Instead, we, like the Ninth Circuit before us, find the Tenth Circuit’s analysis in
Lennen
persuasive.
See Trailer Train Co. v. State Bd. of Equalization,
It is a well-established rule that where Congress expressly provides for injunctive relief to prevent violations of a statute, a plaintiff does not need to demonstrate irreparable harm to secure an injunction.
See United States v. City of San Francisco,
Along with the Tenth and Ninth Circuits, we believe section 306 falls within the category of statutes that limit the traditional equitable discretion of the courts. The purpose of the 4-R Act was “to promote the revitalization of [the United States] railway system.” 4-R Act § 101(a),
Bair urges us to reject the Tenth Circuit’s analysis in
Lennen,
arguing that the decision conflicts with the United States Supreme Court’s opinion in
Weinberger v. Romero-Barcelo,
Romero-Barcelo
held that a statute that expressly provides for equitable relief does not automatically restrict a district court’s traditional equitable discretion. The Supreme Court recognized, nonetheless, that the Congress may impose such restrictions, either explicitly in the statute’s text or implicitly in its scheme.
Id.
at 313. As an example, the Court discussed its opinion in
Tennessee Valley Auth. v. Hill,
*603 We believe that Bair’s comparison between the 4-R Act and the FWPCA is inapposite. If any comparison is proper, it is between the 4-R Act and the ESA. Section 306 contains a flat ban on discriminate-ry taxation of railroads and the only form of relief available to prevent a violation of this ban is equitable. Moreover, a state that levies a discriminatory tax is not merely violating a technical provision of section 306; it is violating the very purpose of the section. As such, we do not agree with Bair’s assertion that Romero-Barcelo undermines the analysis contained in Lennen and similar cases. On the contrary, we believe that the analysis of Romero-Barce-io supp0rts Lennen’s holding,
Consequently, we conclude that a district court should grant a preliminary injunction under section 306 where a plaintiff has shown reasonable cause for the court to believe that a violation of the section has or is about to occur. 4
*604 B. Relevant Evidence
Bair’s next contention is that the district court erred in failing to consider his evidence when determining whether reasonable cause existed to believe that Iowa’s 1989 ad valorem taxes levied against BNRR violated the 4-R Act. We agree. The district court’s reliance on the conclu-sory language of
Sharp ex rel. NLRB v. Omaha Bldg. & Constr. Trades Council,
The
Sharp
court relied primarily on two earlier Eighth Circuit decisions,
Hendrix ex rel. NLRB v. International Union of Operating Eng’rs, Local 571,
In reaching its conclusion, the
Solien
court quoted from our decision in
Hendrix ex rel. NLRB v. Amalgamated Meat Cutters & Butcher Workmen, Dist. Local 340,
The
Wilson
court relied on an earlier decision as well,
Local Joint Bd., Hotel & Restaurant Employees & Bartenders Int’l Union v. Sperry,
Sharp's holding, consequently, ultimately rests on the principle that the district court must defer to the NLRB on disputed matters under section 10(Z) because the NLRB, not the district court, is the final *605 adjudicator of disputed fact issues under the NLRA. This deference to an administrative agency’s authority, not any inherent aspect of the reasonable cause standard, explains why the district court examines only the petitioner’s evidence when applying the reasonable cause standard under section 10(Z). As discussed above, the reasonable cause standard flows from Congress’s decision to expressly authorize in-junctive relief in an act. Deference to the petitioner under an act such as the NLRA, in contrast, stems from Congress’s decision to grant primary fact-finding authority to the petitioner and not the court. The district court’s reliance on Sharp, thus, is misplaced because unlike under the NLRA, the district court is the primary fact-finder under the 4-R Act. See 4-R Act § 306. As fact-finder, the district court does not owe special deference to the petitioner and, therefore, should consider all the evidence in applying the reasonable cause standard under section 306.
A simple analogy between proceedings under the NLRA and those under the 4-R Act, further clarifies that the district court, as fact-finder under the 4-R Act, should consider evidence from both parties before deciding whether to grant a preliminary injunction.
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The NLRB, as fact-finder under the NLRA, presumably considers all the evidence available to it before deciding whether to seek a preliminary injunction. The NLRB then petitions the district court when it decides, after a preliminary investigation, that reasonable cause exists to believe that a violation of the NLRA has occurred.
See
NLRA § 10(Z). The NLRB goes to the district court because it has no authority to issue an injunction on its own. The district court’s role under section 10(Z), therefore, is largely limited to granting injunctions where the NLRB’s decision has a rational basis.
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Thus, the court only examines the NLRB’s evidence in determining whether reasonable cause exists.
See Sharp,
III. CONCLUSION
Bair also raises various factual issues on appeal, but because we reverse the district court’s ruling that it should only consider BNRR’s evidence in deciding whether to grant a preliminary injunction, our examination of Bair’s factual claims would be premature. We instead remand the case to the district court for further proceedings consistent with this opinion.
Notes
. Section 306 reads in pertinent part:
[T]he district courts of the United States shall have jurisdiction, without regard to amount in controversy or citizenship of the parties, to grant such mandatory or prohibitive injunc-tive relief, interim equitable relief, and declaratory judgments as may be necessary to prevent, restrain, or terminate any acts in violation of this section, except that ... no relief may be granted under this section unless the ratio of assessed value to true market value, with respect to transportation property, exceeds by at least 5 per centum the ratio of assessed value to true market value, with respect to all other commercial and industrial property in the same assessment jurisdiction.
4-R Act § 306.
. This court outlined the proper equitable considerations for determining whether an injunction should issue in
Dataphase Sys., Inc. v. C L Sys., Inc.,
. The
Lennen
court adopted the phrase "reasonable cause” by analogizing section 306 to sections 10(j) and 10(Z) of the National Labor Relations Act (NLRA), 29 U.S.C. § 160(j), (Z) (1988) (as amended by Labor Management Relations Act, 1947, ch. 120, § 101, 61 Stat. 136, 149-50), which authorize district courts to enjoin, at the request of the National Labor Relations Board, alleged violations of the NLRA.
See Lennen,
The Eighth Circuit, in particular, has held that an injunction should issue under sections 10(j) and 10(Z) where (1) reasonable cause exists to the believe that a violation of the NLRA has occurred and (2) injunctive relief is just and proper.
See Minnesota Mining & Mfg. Co. v. Meter ex rel. NLRB,
Bair contends that a comparison between the NLRA and the 4-R Act is inappropriate because the Eighth Circuit standards for granting injunctions under sections 10(j) and 10(Z) actually differ. According to Bair, Sperry adopted the reasonable cause standard under section 10(Z), but Minnesota Mining rejected this standard in favor of traditional equitable principles under section 10(j). He explains the distinction by noting that section 10(j) does not contain the words “reasonable cause,” while section 10(Z) does. Compare NLRA § 10(j) with id. § 10(Z). Finally, Bair infers that because section 306 also does not contain the words "reasonable cause," if any section of the NLRA should serve as a guide, it should be section 10(j), not section 10(Z).
Bair’s analysis is flawed.
Minnesota Mining
does not reject reasonable cause as part of the standard for issuing injunctions under section 10(j).
Minnesota Mining
simply holds that reasonable cause alone is insufficient; injunctive relief also must be just and proper considering all the facts and circumstances of the case.
Minnesota Mining,
We, however, need not resolve the potential inconsistency in the application of sections 10(j) and 10(Z). Unlike these sections, section 306 contains no language granting the district court discretion to determine whether injunctive relief is "just and proper." Instead, section 306 directs the court to issue whatever injunctive relief "as may be necessary" to prevent a violation of the section. Compare NLRA § 10(j), (Z) with 4-R Act § 306. The just and proper prong of the standard under sections 10(j) and 10(Z), therefore, does not serve as a guide in interpreting section 306.
Moreover, we note that the comparison between section 306 and sections 10(j) and 10(Z) is nothing more than a helpful analogy. As the result of litigation concerning sections 10(j) and 10(Z) (section Í0(Z) in particular), the reasonable cause prong of the standard for issuing injunctions under these sections has become a well-developed alternative to traditional equitable principles. We adopt the reasonable cause prong as the alternative standard in the section 306 context because it is appropriate, not because our interpretation of sections 10(j) and 10 (Z) compels us to do so.
. The standard for issuing injunctions under section 10(1) is actually two-fold: (1) reasonable cause must exist to believe that a violation of the NLRA exists and (2) injunctive relief must be just and proper.
Sharp,
. BNRR contends that its position under section 306 is analogous to the NLRB’s position under section 10(7). As this paragraph demonstrates, BNRR’s analogy is seriously flawed. Its position is more comparable to that of a party who initially files a complaint with the NLRB, alleging that an unfair labor practice has occurred.
. Although the district court also has discretion to determine whether injunctive relief is just and proper, this discretion is limited in practice. See supra note4.
