Rolling Stock & Bogies Patents: Who Leads, Where the Gaps Are 2026
- Filing has fallen sharply since the peak. from 47 filings in 2021 to 9 in 2024, an 81% drop over that span, though 2025-26 counts are still filling in as publications lag filing by roughly 18 months.
- Running gear and bogies dominate the claim space. B61F accounts for 982 of the 1,639 records in scope (59.9%), dwarfing every other subclass including traffic control and vehicle bodies.
- The leader board has a long tail. the top 5 assignees hold 23.5% of all 1,639 records and the top 10 hold 33.3%, leaving two-thirds of filings spread across a wide field of smaller players.
Filing growth compares 2021 (47 records) with 2024 (9) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 1,639 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset covers 1,639 published records filed against rolling stock and bogie technology between 2015 and the August 2026 data cut-off, searched across rail rolling stock, railway bogies, vehicle suspension, bogie frames, fare validation, passenger information and wheel-rail interaction terms. The corpus spans running gear, vehicle bodies, brakes, traffic control, auxiliary equipment and cableway systems, giving a cross-section of where mechanical and control-system innovation in rail vehicles is actually being claimed.
Records were pulled from major receiving offices including Japan, the United Kingdom, the United States, the EPO, Australia and WIPO's PCT route, so the picture reflects both domestic rail-manufacturing markets and internationally filed families.
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Filing trend and technology composition
Two views of the same 1,639 records: how filing volume has moved year over year, and how those records split across the IPC subclasses that define the rolling-stock and bogie space.
Filing trend, 2017-2026
Annual filings ran from 36 in 2017 to a peak of 57 in 2018, then declined through the following years to 4 in 2026 (a partial year). The clearest complete-year comparison is 2021 to 2024, where filings fell 81% from 47 to 9 — a real contraction, not a publication-lag artefact, though the last one to two years will still revise upward as pending applications publish.
IPC subclass composition
B61F (railway running gear and bogies) covers 59.9% of the 1,639 records, far ahead of B61L traffic control (8.0%), B61D vehicle bodies (7.3%), B61C locomotives and railcars (7.0%), B61K auxiliary equipment (5.6%), B61H brakes (5.4%), B61B systems and cableways (4.3%) and F16F springs and dampers (3.7%). Records can carry multiple classes, so these shares sum to more than 100%.
Shares are the percentage of the 1,639 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Rolling Stock & Bogies Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about rolling stock & bogies patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited records
WO2024142005A1 — Welding fixture for a railway bogie frame
The welding fixture for the railway bogie frame includes a left support and a right support with mirror construction, which are slidably connected with a central base through transverse brackets, whereby the central base includes two connecting members and a swing-beam holder mutually connected with the longitudinal beam. The connecting members and the transverse brackets are mutually slidably placed for an alteration of the mutual distance of the left and right support, with setting mechanisms mounted inside the transverse brackets and vertical clamps applying pressure.Filed by Slovenská Technická Univerzita v Bratislave, published 2024-07-04.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20070217670A1 | On-train rail track monitoring system | 163 |
| 2 | US6216985B1 | Railway hazard acoustic sensing, locating, and alarm system | 139 |
| 3 | US20150217790A1 | Data communication system and method | 112 |
| 4 | US4067261A | Damping railway vehicle suspension | 111 |
| 5 | US20160359741A1 | Data communication system and method | 105 |
| 6 | US4077590A | Integrated treadway cargo handling system | 101 |
| 7 | US20080304065A1 | Rail Sensing Apparatus Method | 92 |
| 8 | US20140358394A1 | Jolt and Jar Recorder System and Methods of Use Thereof | 91 |
| 9 | US3233559A | Transportation means | 83 |
| 10 | US5801473A | Open stator axial flux electric motor | 76 |
Citation counts favour older filings that have had more time to accumulate citations inside this corpus; treat them as a signal of influence within the searched set, not as a ranking of current technical importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the ranking, trend and citation data that matter for anyone deciding where to file or who to watch.
The top of the field is modest, not dominant
The leading assignee holds 125 records against a total of 1,639, and the top 5 combined account for 23.5% of all records in scope. That leaves more than three-quarters of the field to the remaining ranked companies and unranked filers, a pattern more consistent with a fragmented supplier base than a market controlled by one or two designs.
Filing volume has contracted sharply through 2024
Filings dropped from 47 in 2021 to 9 in 2024, an 81% fall over three complete years. The leading assignees named in the momentum data show zero filings in the latest year, consistent with a broader pullback rather than one company stepping back while others fill in.
Running gear and bogies absorb most of the claim space
B61F alone touches 982 of the 1,639 records, nearly six in ten. Every other subclass, from traffic control to brakes to springs and dampers, sits in single digits by comparison, marking B61F as the densest prior-art zone and the other classes as comparatively open by volume.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to rolling stock & bogies patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| BNSF Railway Company | AIRFLOW SCIENCES CORP | 27 |
| AB SKF | ContiTech Luftfedersysteme GmbH | 21 |
| Railway Technical Research Institute | Subaru Corporation | 18 |
| Bombardier Transportation GmbH | Carl Freudenberg KG | 15 |
| Kawasaki Heavy Industries, Ltd. | Kawaju Rolling Stock Engineering | 14 |
| Hitachi, Ltd. | Railway Technical Research Institute | 13 |
| Hitachi, Ltd. | Japanese National Railways | 11 |
| Railway Technical Research Institute | Japanese National Railways | 10 |
Ten co-assignee pairs appear in the data, with the strongest pairings linking a railway operator to a specialist supplier (such as a rail vehicle systems firm) or two suppliers with adjacent expertise (such as a bearing specialist and an air-spring systems maker) — a pattern of operator-supplier and supplier-supplier collaboration rather than pure in-house development.
Who is filing, and where the gaps sit
The ranked leaders span heavy rail manufacturers, component specialists and research institutes; the gate below flags sub-areas that show comparatively little claim density relative to the core running-gear space.
A single leader well ahead of fifth place
The top-ranked assignee holds 125 records against 53 for fifth place and 27 for tenth, a steep drop-off that marks a genuine leader rather than a cluster of near-equals at the top.
Even leaders show no recent-year filings
Several of the most heavily ranked assignees, including large rail manufacturers and a national research institute, show zero filings in the latest year with -100% YoY where prior-year activity existed. This is consistent with the broader contraction seen in the overall filing trend, not isolated to one company.
Filing activity spans manufacturing and PCT routes
Japan leads at 299 records, ahead of the United Kingdom (227), the United States (217), the EPO (201), Australia (158) and the WIPO PCT route (74), indicating both strong domestic rail-manufacturing filing and a meaningful share of internationally routed families.
| Assignee | Recent year | YoY |
|---|---|---|
| Hitachi, Ltd. | 0 | -100% |
| Kawasaki Heavy Industries, Ltd. | 0 | — |
| GENERAL STEEL IND INC | 0 | — |
| Bombardier Transportation GmbH | 0 | — |
| Railway Technical Research Institute | 0 | — |
| AB SKF | 0 | — |
| Subaru Corporation | 0 | — |
| Sumitomo Metal Industries, Ltd. | 0 | — |
Where to take this analysis
The dataset behind this page can be filtered further to test a specific filing strategy or freedom-to-operate question.
Check freedom-to-operate against the densest class
With B61F covering 59.9% of records, a new bogie-frame or suspension filing is likely to sit close to existing claims. Eureka can pull the specific claim sets in that subclass for a design-around review.
Run a freedom-to-operate searchTrack the leaders showing zero recent filings
Several top-ranked assignees show no filings in the latest year. Whether that reflects a genuine pullback or a publication-lag gap matters for competitive planning, and can be checked against pending applications.
Monitor assignee filing activityExplore the under-claimed branches
Fare validation, passenger information systems and cableway-specific running gear show comparatively light claim density next to the core bogie classes. That is where a first-mover filing has more room to stake a broad claim.
Explore white space in EurekaCommon questions about this landscape
The leading assignee in this dataset holds 125 of the 1,639 records in scope, well ahead of fifth place at 53 and tenth place at 27. That said, the top 10 assignees combined account for only 33.3% of all records, so no single company controls the field outright. The remaining two-thirds of filings are spread across a long tail of smaller manufacturers, component suppliers and research institutes, which matters if you are scoping a freedom-to-operate search: you cannot rely on checking just the largest filer's portfolio.
Filing has contracted over the last complete filing years tracked: 2021 saw 47 filings and 2024 saw 9, an 81% drop. The peak year in the dataset was 2018 at 57 filings, so the field has come down substantially from its high point. The most recent one to two years should be read cautiously, since publication typically lags filing by around 18 months and those counts will still revise upward as pending applications publish.
Railway running gear and bogies (IPC class B61F) dominate by a wide margin, covering 59.9% of the 1,639 records in this dataset. The next largest areas are railway traffic control at 8.0% and railway vehicle bodies at 7.3%, with brakes, auxiliary equipment, locomotives, cableway systems and springs/dampers each in the single digits. Because a single record can carry more than one IPC class, these percentages add up to more than 100%, but the gap between B61F and everything else is the clearest structural feature of the data.
Relative to the dense B61F running-gear core, sub-areas such as fare validation hardware, passenger information display systems, cableway-specific running gear and auxiliary equipment for railway systems show comparatively light claim density in this corpus. That does not mean these areas are unclaimed, but the volume of prior art is lower than in bogie frames and suspension, which typically gives a new filer more room to stake a broadly worded first claim rather than working around dense existing coverage.
It is moderately concentrated at the very top and long-tailed beneath it. The top 5 assignees hold 23.5% of the 1,639 records in scope and the top 10 hold 33.3%, meaning the majority of filings sit outside the most active ten companies. Combined with a filing trend that has fallen sharply since 2021 and several top-ranked assignees showing zero filings in the latest year, the picture is one of a maturing, fragmented field rather than a market being actively consolidated by one or two dominant players.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.