IP Law Daily, PATENT—Fed. Cir.: National Steel Car’s infringement claims against Greenbrier properly dismissed, (Nov 19, 2025)

By Saurabh Kashyap, B.A., M.A., LL.B., LL.M.

District court correctly found that Greenbrier’s railcars lacked the required physical contact between the side wall web and the floor panel.

In a non-precedential disposition, the U.S. Court of Appeals for the Federal Circuit affirmed an Oregon district court’s ruling that granted summary judgment of non-infringement to Greenbrier-Concarril LLC and its affiliates in a patent dispute with Canadian railcar manufacturer National Steel Car Ltd. (NSC). The Federal Circuit upheld the Oregon district court’s conclusion that Greenbrier’s railcars did not meet the claim limitation requiring that a “side wall web” be “directly mated” to the floor panel, a critical requirement in each asserted claim of NSC’s patents (National Steel Car Ltd. v. Greenbrier-Concarril LLC, No. 24-1453 (Fed. Cir. Nov. 19, 2025)).

Background. The plaintiff/appellant, National Steel Car Ltd., is a major Canadian railcar manufacturer known for its design and production of freight railcars, including gondola cars. The defendants/appellees include Greenbrier-Concarril LLC, a U.S.-Mexico joint venture engaged in the manufacture of railcars, and related entities.

In the lawsuit, NSC asserted its U.S. Patent Nos. 7,434,519 (the ’519 patent) and 7,878,125 (the ’125 patent) covering structural designs for open-topped gondola freight railcars. These patents describe a unibody configuration in which the gondola car’s floor and wall components are integrated to form a reinforced load-bearing structure. Representative Claim 22 of the ’519 patent describes a gondola car with a “floor panel” that is “directly mated” to a side wall web structure—a design feature aimed at improving mechanical strength and reducing material use.

NSC filed this suit in the District of Oregon, alleging that four Greenbrier-designed gondola car models infringed 19 claims from the two patents. NSC alleged infringement of claims 2–4, 8, 9, 11, 13–15, 18, 19, and 22–24 of the '519 patent and claims 1, 15, 16, 18, and 19 of the '125 patent. The key issue was whether the accused railcars satisfied the claim limitation requiring the side wall web to be in physical contact with the floor panel.

Following a Markman hearing, the district court construed the term “floor panel” to mean “one sheet, or a plurality of sheets joined together, and may also include one or more extensions, which may be integral, or which can be separate.” The court clarified that “separate” meant non-integral but still required physical contact with the floor panel. After extensive briefing, reconsideration of the claim construction, and two rounds of oral argument, the district court granted summary judgment of non-infringement to Greenbrier. NSC appealed.

Claim construction. The Federal Circuit reviewed the district court's construction de novo. The appellate panel found the district court's interpretation of "floor panel" consistent with the patent specifications, which describe extensions as integral or separate but not disjointed from the floor panel. It agreed with the lower court that "separate" referred to a non-integral configuration, i.e., extensions were not made from the same material or monolithic sheet but were still in physical contact with the floor panel.

The court also rejected NSC's argument that the district court improperly narrowed the term "extension" to "floor panel extension." It held that the lower court's construction did not introduce a new limitation but correctly interpreted "extension" as pertaining to the floor panel.

Citing Teva Pharmaceuticals USA, Inc. v. Sandoz, Inc., 574 U.S. 318 (2015), and SpeedTrack, Inc. v. Amazon.com, Inc., 998 F.3d 1373 (Fed. Cir. 2021), the court reiterated that extrinsic evidence may support but not override intrinsic evidence. While the district court considered an expert's testimony and dictionary definitions, it did not base its construction on them.

Non-infringement. Under the proper claim construction, the Federal Circuit held that there was no genuine dispute of material fact. Greenbrier's accused railcars used side-post gussets (horizontal plates supporting vertical side posts) located outboard of the lading container. These gussets did not directly contact the floor panel due to the intervening side sill. Therefore, the side wall web in Greenbrier's cars was not "directly mated" to the floor panel, as required by the asserted claims.

Because the physical contact limitation was common to all claims at issue, this fact alone was dispositive. The Federal Circuit thus affirmed summary judgment of non-infringement, noting that NSC’s alternate infringement theories would still fail under the correct construction.

Abuse of discretion. NSC also challenged the denial of its motion for reconsideration and/or clarification, arguing that the district court had shifted its interpretation of “floor panel extension” in its summary judgment ruling. The Federal Circuit disagreed, finding no procedural irregularity. It held that the district court provided ample notice and opportunity for NSC to argue its position, including supplemental briefing specifically on the floor panel and gusset issues.

Citing Kona Enterprises, Inc. v. Estate of Bishop, 229 F.3d 877, 890 (9th Cir. 2000), the court emphasized that reconsideration is not a vehicle to reargue matters already decided or to raise new arguments that could have been presented earlier. It noted that the summary judgment ruling followed full claim construction proceedings, supplemental briefings, and two hearings, and that the district court had clearly explained its construction at each stage.

Remand. NSC further argued that, even if the Federal Circuit affirmed the claim construction, the case should be remanded to allow it to present alternative theories of infringement under the court’s “clarified” construction. The appellate court rejected this request, finding that NSC had been provided with sufficient process to develop its infringement case and that no new construction had been introduced that would warrant additional proceedings.

Thus, the Federal Circuit affirmed the district court’s grant of summary judgment, holding that Greenbrier’s gondola railcars do not infringe NSC’s asserted patents under the proper construction of “floor panel.”

The Case is No. 24-1453.

Judge: Andrews, R.

Attorneys: Craig D. Leavell (Barnes & Thornburg LLP) for National Steel Car Ltd. Jonathan Pieter Van ES (Banner & Witcoff, Ltd.) for Greenbrier-Concarril LLC, Greenbrier Leasing Co., LLC and Greenbrier-Gimsa, LLC.

Companies: National Steel Car Ltd.; Greenbrier-Concarril LLC; Greenbrier Leasing Co., LLC; Greenbrier-Gimsa, LLC

Cases: Patent FedCirNews OregonNews