KEITH, J., delivered the opinion of the court, in which COOK, J., joined. CLAY, J. (pp. 370-72), delivered a separate dissenting opinion.
OPINION
KEITH, Circuit Judge.
This case centers around a labor dispute between Plaintiffs CSX Transportation, Inc., and Consolidated Rail Corporation (“CSX and Conrail”) and Defendants United Transportation Union, et al. (“UTU”). At issue is whether the district court erred in determining that the dispute, which is over the substantive scope of a national moratorium on contractual negotiations between the parties, is a “major” dispute under the terms of the Railroad Labor Act (“RLA”). 45 U.S.C. § 151. Upon our review of the law and the record, we believe [367]*367this matter is a “minor” dispute and must be resolved via the arbitration procedures set forth for resolving such disputes in the RLA. Id. § 153. We therefore REVERSE the district court’s determination.
I. Background
A. The Railway Labor Act
The RLA provides mandatory procedures for resolving disagreements between railroad companies and the unions representing their employees. 45 U.S.C. § 151(a). Under the RLA, a dispute must first be classified as either “major” or “minor” and will then be resolved in accordance with procedures set for that classification. A dispute is considered “major” if the parties are changing terms of an existing collective bargaining agreement and is considered “minor” if it is merely a dispute over the application or interpretation of provisions in existing agreements.1 Consol. Rail Corp. v. Ry. Labor Executives’ Ass’n, 491 U.S. 299, 302, 109 S.Ct. 2477, 105 L.Ed.2d 250 (1989) (“Conrail ”) (citing Elgin, J. & E.R. Co. v. Burley, 325 U.S. 711, 723, 65 S.Ct. 1282, 89 L.Ed. 1886 (1945)). In a major dispute, the party who wishes to amend a bargaining agreement must serve the other party notice of an intended change. This is known as a “Section 6 notice.” 45 U.S.C. § 156. If the parties are unable to reach an agreement after negotiation, either may seek mediation with the National Mediation Board (“NMB”). Id. § 155. Should that mediation fail, a Presidential Emergency Board may be appointed. Id. § 160. Throughout the entire process, the existing agreement remains intact. Detroit & Toledo Shore Line R.R. v. United Transp. Union, 396 U.S. 142, 150, 90 S.Ct. 294, 24 L.Ed.2d 325 (1969).
Unlike major disputes, the RLA mandates that minor disputes be handled in the company’s or union’s typical manner for handling claims and grievances that occur on railroad property. 45 U.S.C. § 153 First (I). If the grievance cannot be settled through those means, either party can remove the case to binding arbitration before the National Railroad Adjustment Board (“NRAB”) or another agreed-upon arbitration board. Conrail, 491 U.S. at 303-04, 109 S.Ct. 2477.
B. Facts
Plaintiffs CSX and Conrail are two large unionized railroad companies. The train operators and support staff that they locally employ are represented by Defendants UTU. The dispute between the parties began when CSX and Conrail issued a notice of their intent to begin using “push cars” on their Northern District railway lines on March 21, 2002.2 In response, UTU served Section 6 notices requesting, among other things, to bargain about the use of push cars to CSX and Conrail in March 2002. The Section 6 notices requested that the parties establish a rule concerning the construction, use, equipment and safety rules for “push cars,” and amend the current crew policy to include more employee-friendly and safety benefits. On April 2, 2002, CSX and Conrail responded by suggesting that the issues be handled in the forthcoming national bargaining discussions, which were scheduled to be held [368]*368in August of 2002. UTU declined the offer. On May 6 and July 20, 2002, the parties met to discuss the issues but did not reach an agreement. At the July meeting they collectively scheduled their next discussion for September 24, 2002, just over one month after a planned bargaining meeting between the national representatives of the union and various railroads.
At that meeting, held in August 2002, the numerous railroads represented by the National Carriers’ Conference Committee, including CSX and Conrail, and the national leadership of UTU entered into a national bargaining agreement on employee compensation and benefits. The agreement contained a moratorium provision that precluded either party from seeking to change any part of the agreement, and explicitly prohibited the filing of any Section 6 notices prior to November 1, 2004. It also dismissed or settled all existing Section 6 notices “dated on or subsequent to November 1,1999.”
Because the push car issue was born of a Section 6 notice, CSX and Conrail subsequently notified UTU in writing that the moratorium barred any further discussion, despite the fact that the issue had not been discussed at the national meeting. The letter stated that if UTU disagreed with this position, the matter could then be set for handling in arbitration pursuant to Section 3 of the RLA, i.e., as a “minor” dispute. UTU disagreed with CSX and Conrail’s interpretation of the moratorium and maintained that, because the push ear issue and other issues that were related to their March Section 6 notice were not discussed during the August 2002 proceedings, the moratorium did not apply.
CSX and Conrail filed a complaint in the United States District Court for the Northern District of Ohio, seeking a declaratory judgment that the parties’ dispute over the interpretation of the moratorium provision was a “minor” issue under the RLA and could thus be worked out in arbitration proceedings before the National Railroad Adjustment Board (“NRAB”). In granting summary judgment for UTU, the district court held that dispute over whether the moratorium provision did not bar the progression of the mediation over the Section 6 notices was a major dispute. As such, the court concluded that a dispute should be resolved via the negotiation and mediation procedures required for major disputes under the RLA. The district court denied CSX and Cqnrail’s motion for reconsideration and CSX and Conrail filed this timely appeal.
II. Analysis
This court reviews the district court’s grant of summary judgment de novo. Airline Prof'ls. Ass’n of the Int’l Bhd. of Teamsters, Local Union No. 1224 v. ABX Air, Inc., 274 F.3d 1023, 1029-1030 (6th Cir.2001) (citations omitted).
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KEITH, J., delivered the opinion of the court, in which COOK, J., joined. CLAY, J. (pp. 370-72), delivered a separate dissenting opinion.
OPINION
KEITH, Circuit Judge.
This case centers around a labor dispute between Plaintiffs CSX Transportation, Inc., and Consolidated Rail Corporation (“CSX and Conrail”) and Defendants United Transportation Union, et al. (“UTU”). At issue is whether the district court erred in determining that the dispute, which is over the substantive scope of a national moratorium on contractual negotiations between the parties, is a “major” dispute under the terms of the Railroad Labor Act (“RLA”). 45 U.S.C. § 151. Upon our review of the law and the record, we believe [367]*367this matter is a “minor” dispute and must be resolved via the arbitration procedures set forth for resolving such disputes in the RLA. Id. § 153. We therefore REVERSE the district court’s determination.
I. Background
A. The Railway Labor Act
The RLA provides mandatory procedures for resolving disagreements between railroad companies and the unions representing their employees. 45 U.S.C. § 151(a). Under the RLA, a dispute must first be classified as either “major” or “minor” and will then be resolved in accordance with procedures set for that classification. A dispute is considered “major” if the parties are changing terms of an existing collective bargaining agreement and is considered “minor” if it is merely a dispute over the application or interpretation of provisions in existing agreements.1 Consol. Rail Corp. v. Ry. Labor Executives’ Ass’n, 491 U.S. 299, 302, 109 S.Ct. 2477, 105 L.Ed.2d 250 (1989) (“Conrail ”) (citing Elgin, J. & E.R. Co. v. Burley, 325 U.S. 711, 723, 65 S.Ct. 1282, 89 L.Ed. 1886 (1945)). In a major dispute, the party who wishes to amend a bargaining agreement must serve the other party notice of an intended change. This is known as a “Section 6 notice.” 45 U.S.C. § 156. If the parties are unable to reach an agreement after negotiation, either may seek mediation with the National Mediation Board (“NMB”). Id. § 155. Should that mediation fail, a Presidential Emergency Board may be appointed. Id. § 160. Throughout the entire process, the existing agreement remains intact. Detroit & Toledo Shore Line R.R. v. United Transp. Union, 396 U.S. 142, 150, 90 S.Ct. 294, 24 L.Ed.2d 325 (1969).
Unlike major disputes, the RLA mandates that minor disputes be handled in the company’s or union’s typical manner for handling claims and grievances that occur on railroad property. 45 U.S.C. § 153 First (I). If the grievance cannot be settled through those means, either party can remove the case to binding arbitration before the National Railroad Adjustment Board (“NRAB”) or another agreed-upon arbitration board. Conrail, 491 U.S. at 303-04, 109 S.Ct. 2477.
B. Facts
Plaintiffs CSX and Conrail are two large unionized railroad companies. The train operators and support staff that they locally employ are represented by Defendants UTU. The dispute between the parties began when CSX and Conrail issued a notice of their intent to begin using “push cars” on their Northern District railway lines on March 21, 2002.2 In response, UTU served Section 6 notices requesting, among other things, to bargain about the use of push cars to CSX and Conrail in March 2002. The Section 6 notices requested that the parties establish a rule concerning the construction, use, equipment and safety rules for “push cars,” and amend the current crew policy to include more employee-friendly and safety benefits. On April 2, 2002, CSX and Conrail responded by suggesting that the issues be handled in the forthcoming national bargaining discussions, which were scheduled to be held [368]*368in August of 2002. UTU declined the offer. On May 6 and July 20, 2002, the parties met to discuss the issues but did not reach an agreement. At the July meeting they collectively scheduled their next discussion for September 24, 2002, just over one month after a planned bargaining meeting between the national representatives of the union and various railroads.
At that meeting, held in August 2002, the numerous railroads represented by the National Carriers’ Conference Committee, including CSX and Conrail, and the national leadership of UTU entered into a national bargaining agreement on employee compensation and benefits. The agreement contained a moratorium provision that precluded either party from seeking to change any part of the agreement, and explicitly prohibited the filing of any Section 6 notices prior to November 1, 2004. It also dismissed or settled all existing Section 6 notices “dated on or subsequent to November 1,1999.”
Because the push car issue was born of a Section 6 notice, CSX and Conrail subsequently notified UTU in writing that the moratorium barred any further discussion, despite the fact that the issue had not been discussed at the national meeting. The letter stated that if UTU disagreed with this position, the matter could then be set for handling in arbitration pursuant to Section 3 of the RLA, i.e., as a “minor” dispute. UTU disagreed with CSX and Conrail’s interpretation of the moratorium and maintained that, because the push ear issue and other issues that were related to their March Section 6 notice were not discussed during the August 2002 proceedings, the moratorium did not apply.
CSX and Conrail filed a complaint in the United States District Court for the Northern District of Ohio, seeking a declaratory judgment that the parties’ dispute over the interpretation of the moratorium provision was a “minor” issue under the RLA and could thus be worked out in arbitration proceedings before the National Railroad Adjustment Board (“NRAB”). In granting summary judgment for UTU, the district court held that dispute over whether the moratorium provision did not bar the progression of the mediation over the Section 6 notices was a major dispute. As such, the court concluded that a dispute should be resolved via the negotiation and mediation procedures required for major disputes under the RLA. The district court denied CSX and Cqnrail’s motion for reconsideration and CSX and Conrail filed this timely appeal.
II. Analysis
This court reviews the district court’s grant of summary judgment de novo. Airline Prof'ls. Ass’n of the Int’l Bhd. of Teamsters, Local Union No. 1224 v. ABX Air, Inc., 274 F.3d 1023, 1029-1030 (6th Cir.2001) (citations omitted). We also review de novo the district court’s legal determination of whether a dispute is classified as minor or major under the RLA. Gen. Comm. of Adjustment, United Transp. Union, W. Md. Ry. Co. v. CSX R.R. Corp., 893 F.2d 584, 589 (3d Cir.1990).
Our case law dictates that if CSX and Conrail’s interpretation that the moratorium provision should apply to the Section 6 notices at issue is arguably justified, then the issue should be resolved under the RLA’s procedures for minor disputes. We have previously held that a dispute over whether a moratorium provision can be interpreted to bar the serving of Section 6 notices is a minor dispute within the exclusive jurisdiction of an arbitrator. Int’l Longshoremen’s Ass’n, Local 158 v. Toledo Lakefront Dock & Pellet Co., 776 F.2d 1341, 1344 (6th Cir.1985) (finding that [369]*369a docking company’s interpretation of a moratorium to be arguably justified and therefore a minor issue).
Applying the classification test here, established by the United States Supreme Court in Conrail, leads us to the same conclusion. Under the Conrail test, a labor dispute is classified as minor when a party’s assertion that its proposed action is permitted by the collective bargaining agreement is “arguably justified” by the terms of the agreement. Conrail, 491 U.S. at 307, 109 S.Ct. 2477; see also United Transp. Union v. Cuyahoga Valley Ry. Co., 979 F.2d 431, 434 (6th Cir.1992) (finding that “[w]hen it is unclear whether a dispute is [minor or major], the dispute should be characterized as minor if the [party’s] actions are ‘arguably justified by the terms of the parties’ collective-bargaining agreement”). But if, in an effort to justify its action, the party presents an “obviously insubstantial,” or “frivolous,” interpretation of the agreement, then the agreement will need to be amended in order for the party’s proposed action to proceed. In such an instance, the dispute will be classified as major and the parties will enter into mediated discussions on amending the agreement as provided for under the RLA. Conrail, 491 U.S. at 303-04, 109 S.Ct. 2477. The moving party carries a “relatively light burden” in establishing that its interpretation is arguably justified by the terms of the agreement. Id. at 307, 109 S.Ct. 2477.
The facts of this case indicate that CSX and Conrail’s argument that the moratorium should prohibit further negotiations on UTU’s March 2002 Section 6 notices may not be strong, but it is arguably justified by the terms of the August 2002 national agreement. Significantly, the plain language of the August 2002 National Bargaining Agreement supports CSX and Conrail’s claim. Section 2(a) of Article X expressly indicates that a purpose of the 2002 National Agreement is to settle any Section 6 notices dated on or subsequent to November 1,1999:
(a) The purpose of [the 2002] Agreement is to fix the general level of compensation during the period of the Agreement and is in settlement of the dispute growing out of the notices dated November 1, 1999[,] served by and on behalf of the carriers ... upon the organization signatory hereto, and the notices dated on or subsequent to November 1, 1999[,] served by the [unions] upon such carriers.
UTU’s March 2002 Section 6 notices were dated “subsequent to November 1, 1999,” and they were undisputedly served by the union (UTU) on the carriers (CSX and Conrail). Accordingly, Section 2(a) arguably settles the March 2002 Section 6 notices.
Further, Section 2(c) of Article X can arguably be interpreted to halt any mediation between UTU and CSX and Conrail over any outstanding Section 6 notices. It specifically can be read to indicate that discussions surrounding the March 2002 Section 6 notices should not progress and are to be considered “withdrawn” upon the enactment of the new collective bargaining agreement:
(c) The parties to this Agreement shall not serve nor progress prior to November 1, 2004 .... any notice or proposal for changing any matter ...
(3) ... any pending notices which propose such matters are hereby withdrawn, except as otherwise provided in Article IV of this Agreement.
Lastly, UTU points to no language in the August 2002 national agreement, or discussions preceding the agreement, that reflect any intent to exclude their March 2002 Section 6 notices. UTU did not identify any language in the August 2002 [370]*370agreement that indicated that the moratorium covered only Section 6 notices pursuant to national issues and procedures. There also is no language in the August 2002 agreement that limits the scope of the moratorium to national Section 6 notices or issues. None of UTU’s arguments rested on the contract language written by the parties.
This reasoning, however, does not mean that UTU’s arguments are without merit. We emphasize that we do not, as the dissent claims, “accepts Plaintiffs’ claim that the ‘push car’ announcement and Defendant’s resulting section 6 notices fall under the national moratorium provision.” Dissent at 6. In fact, we believe that their argument that the moratorium should not be read to halt their ongoing discussion of the push car issue is supported by the record. The RLA, however, requires us to defer all disputes over interpretations of a collective bargaining agreement that are not “frivolous” or “obviously insubstantial” to arbitration. Conrail, 491 U.S. at 303, 109 S.Ct. 2477. We find that CSX and Conrail’s claim that the moratorium applies to bar discussion of the March 2002 Section 6 notices is arguably justified under the terms of the August 2002 collective bargaining agreement. As such, the district court exceeded its jurisdiction in evaluating their interpretation.of the moratorium provision. The dispute over the scope of the moratorium should therefore be resolved under the arbitration procedures established by the RLA.
CONCLUSION
Based on the foregoing reasoning, .we REVERSE the district court’s decision and REMAND this case for the district court to issue a declaratory judgment that the moratorium dispute is a minor dispute subject to binding arbitration.