Railway Bogie Patents: Leaders, Trends & White Space 2026
- Filing has cooled since 2021. The peak year for this claim set was 2021 at 30 families; by the 2022 midpoint filings had already slipped to 21, and the trend keeps falling into the partial 2026 count.
- China dominates the receiving-office mix. 129 of the tracked filings entered through China, more than three times the next-largest office (EPO at 36), which shapes where enforcement and freedom-to-operate risk actually sits.
- Every major Chinese rolling-stock assignee shows zero filings in the latest year. Six of the most active historical filers, including CRRC Changchun Railway Vehicles Co., Ltd. and BYD Company Limited, register no activity in the most recent tracked year — a pause worth confirming isn't just publication lag.
Filing growth compares 2021 (30 records) with 2024 (11) — 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 249 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families combining railway bogie or rail truck terminology with durability-specific language — frame fatigue, component reliability, service life, structural durability — inside the core running-gear classifications B61F5/52, B61F5/00 and G01M17/10. It captures how bogie makers and rail operators claim protection not for the bogie as a general assembly, but specifically for its fatigue behaviour, wear-out characteristics and test methods.
Filings span 2015 through the 2026 cut-off, with 249 published families forming the assignee ranking. Because publication typically lags filing by around 18 months, the last one to two years in any trend chart will read lower than the true filing rate once the backlog clears.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trend and technology composition
Two views of the same 249-family corpus: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
A rise to 2021, then a pullback
Annual filings climbed from 16 in 2017 to a peak of 30 in 2021, then eased to 21 by 2022 — the stated midpoint — and continued down toward single digits through the partial 2026 year. Read the tail end cautiously: the drop-off from 2024 onward is at least partly a publication-lag artefact, not proof that filing has actually stopped.
Concentrated in running gear, spread into adjacent systems
B61F (railway running gear and bogies) anchors the set at 242 of the tracked records, essentially the full corpus. The next-largest clusters — B61C locomotives and railcars at 40, B61B railway systems and cableways at 23 — show durability claims increasingly reaching into vehicle-level and system-level integration rather than staying isolated to the bogie frame itself. Smaller clusters in B60L propulsion, B61H brakes and G01M testing indicate durability claims are starting to cross into adjacent subsystems, but each of those remains a minority slice.
Shares are the percentage of the 249 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Railway Bogie Reliability and Durability with Eureka
This page is one run against one query. Ask Eureka your own question about railway bogie reliability and durability and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited and most recent filings
EP4729908A1 — Testing device for a railway bogie
The filing describes a bench-mounted testing device for a railway bogie: a support structure carrying a transverse beam, a plate assembly, and a load application device built around a planetary roller screw that applies load toward the bogie under test. It is a physical test-rig claim, not a bogie-design claim — the protected subject matter is how fatigue and durability loads get applied and measured on a bench, not how the bogie itself is built.Filed by OFFICINE MECCANICHE B.B.M. S.P.A., published 2026-04-22.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20160282229A1 | Fault Prediction and Condition-based Repair Method of Urban Rail Train Bogie | 135 |
| 2 | CN202016473U | 米轨转向架 | 26 |
| 3 | US6439130B1 | Self-steering bogies | 26 |
| 4 | CN103802852A | 有轨电车动力转向架 | 23 |
| 5 | CN103802853A | 100%低地板有轨电车非动力转向架及有轨电车 | 20 |
| 6 | CN2483280Y | 抗侧滚扭杆 | 19 |
| 7 | US20110271868A1 | Bogie for guide rail type vehicle | 18 |
| 8 | RU2294293C1 | Rail vehicle, type tram with low-level floor, motor car of electric train or electric locomotive and tram car | 13 |
| 9 | CN209553198U | 悬挂式单轨车辆转向架 | 12 |
| 10 | RU2585131C1 | Railway vehicle drive bogie, primarily low-floor tram | 12 |
Citation counts inside a searched corpus skew toward older filings simply because they have had more time to accumulate citations — treat this table as a map of historical influence, not of what matters today.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the numbers mean for a filing decision
Three figures worth sitting with before deciding where to file or who to watch.
The peak has passed, at least on paper
2021's 30 families is the high point of the tracked window; by the 2022 midpoint activity had already dropped to 21, and the years since keep trending down. Some of that decline is publication lag rather than a real pullback, but a multi-year downward slope through the midpoint is a genuine signal, not just an artefact of the most recent one or two years.
China is where this claim space is actually being built
China accounts for roughly half of all tracked filings, more than the next four receiving offices — EPO, US, Russia and Australia — combined. Freedom-to-operate work on bogie durability claims that ignores Chinese filings is working from a partial picture.
The historically active filers have gone quiet
Several of the most prolific rolling-stock assignees in this dataset — including two of the largest Chinese rail manufacturers — show no filings at all in the most recent tracked year, several with -100% year-on-year figures. That could mean the claim space around their prior filings is now considered settled, or simply that recent filings from these players haven't published yet.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to railway bogie reliability and durability, with the prior art for and against each one.
Who is active, and where the claim space is still open
The ranking itself is rendered separately; here is how to read the pattern behind it and where a new entrant could still stake a first claim.
A concentrated field with a long tail
The 249 families in this ranking sit mostly with a handful of large rolling-stock manufacturers, mostly Chinese state-affiliated groups, with a long tail of single- or few-filing entrants including test-equipment specialists and regional operators.
Enforcement geography follows the filing geography
With China accounting for roughly half the tracked filings and the EPO and US trailing well behind, any freedom-to-operate or licensing strategy needs a China-first read before extending to European or US equivalents.
The leaderboard's top names have stalled
Assignees like CRRC Changchun Railway Vehicles Co., Ltd. and CRRC Qingdao Sifang Co., Ltd. show -100% year-on-year change, with zero filings in the latest tracked year across at least six historically active players.
| Assignee | Recent year | YoY |
|---|---|---|
| CRRC Changchun Railway Vehicles Co., Ltd. | 0 | -100% |
| CRRC Tangshan Co., Ltd. | 0 | — |
| BYD Company Limited | 0 | — |
| CRRC Qingdao Sifang Co., Ltd. | 0 | -100% |
| CRRC Qiqihar Rolling Stock Co., Ltd. | 0 | — |
| CRRC Yangtze Co., Ltd. | 0 | — |
| CRRC Zhuzhou Electric Locomotive Co., Ltd. | 0 | — |
| CRRC Qishuyan Locomotive Co., Ltd. | 0 | — |
Where to take this from here
The landscape tells you where claims already sit. The next step is testing a specific claim idea or a specific competitor against that map.
Draft a claim against the white space
Take one of the under-claimed sub-areas — axle-box bearing wear-life prediction, for instance — and check it against the full 249-family set before committing engineering time to it.
Explore in EurekaTrack the quiet assignees
Several top historical filers show zero activity in the latest year. Confirm whether that is a real pause or a publication-lag effect before assuming the space is open.
Run an assignee monitor in EurekaCommon questions about railway bogie durability patents
The ranking in this dataset is concentrated among a small group of large rolling-stock manufacturers, most of them Chinese state-affiliated groups such as the China Railway Rolling Stock Corporation family of subsidiaries. Several of these same assignees show zero filings in the most recent tracked year, so current leadership on paper does not necessarily mean current filing activity. A practitioner should check both the cumulative count and the recent-year momentum before assuming a given company is still actively expanding its position.
Filings in this corpus rose from 16 in 2017 to a peak of 30 in 2021, then fell to 21 by 2022 and kept declining through the most recent partial year. Part of that late decline is a publication-lag artefact — patent applications typically take around 18 months to publish, so the last one to two years always understate true filing activity. But the drop-off starting well before the most recent years, at the 2022 midpoint, suggests a genuine cooling in new filing rather than just an artefact of lag.
China is by far the largest receiving office in this dataset, with 129 of the 249 tracked families, more than three times the next office. The European Patent Office follows at 36, the United States at 18, and Russia, Australia and India make up smaller shares. This distribution means most enforcement risk and most freedom-to-operate diligence for this claim space needs to start with Chinese filings rather than European or US equivalents.
Nearly all records sit in B61F, the core railway running-gear and bogie classification, but durability-specific claims increasingly extend into B61C (locomotives and railcars) and B61B (railway systems and cableways). Smaller but present clusters in B60L propulsion, B61H brakes and G01M testing show durability claims occasionally crossing into adjacent subsystems and test methodology rather than staying confined to the bogie frame alone. This spread is worth watching because it suggests durability claiming is becoming a vehicle-level concern, not just a component-level one.
Not clearly, based on the tracked trend: after peaking at 30 families in 2021, filings fell to 21 by 2022 and continued declining into single digits by the most recent partial year. Some of that apparent decline reflects publication lag rather than an actual stop in filing, since recent applications simply haven't published yet. The more reliable read is the multi-year decline through the 2022 midpoint, which points to a genuine slowdown in new filing rather than a technology in an early growth phase.
Research Railway Bogie Reliability and Durability in depth with Eureka
Go past this page: query the whole railway bogie reliability and durability corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.