Railway Bogie Safety Patents: Who Leads, Where the Gaps Are 2026
- Filing peaked in 2017 at 4 families and has stayed flat or declined since, with the 2022 midpoint back down to 1 — this is a mature, narrow filing niche, not a growth curve.
- China dominates the receiving offices with 26 of the tracked filings against 7 in the United States and single digits elsewhere, meaning most qualification and derailment-safety claims are anchored in Chinese patent practice.
- No assignee is filing in the latest year every tracked entity, including CRRC Qingdao Sifang and BYD, shows zero filings in the most recent year — a signal that active claim-staking has paused even as the underlying technology keeps shipping.
What this patent set actually covers
This landscape tracks 39 patent families filed between 2015 and 2026 that sit at the intersection of bogie hardware and explicit safety or compliance language — derailment safety, structural safety qualification, running safety, or EN 13749-style qualification testing. The search combines bogie-specific IPC codes (B61F5/00, B61F5/52, B61K9) with safety-qualification terms in the title and claims, so it captures documents that make a safety or compliance argument rather than every bogie patent in existence.
The result is a compact, safety-framed slice of a much larger railway running-gear patent universe. Because publication typically lags filing by around 18 months, the 2025-2026 counts in any trend chart understate true recent filing activity and should be read as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 39-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the safety and compliance claims.
A flat-to-declining filing curve since the 2017 peak
Filings hit 4 in 2017, the high point in the dataset, then fell back toward a midpoint of 1 in 2022. That pattern is consistent with a technology area where the core structural and safety claim space was staked out early, and later filers are adding narrow refinements rather than opening new ground.
B61F carries most of the safety argument, B61K adds the auxiliary layer
B61F (railway running gear and bogies) accounts for 29 of the tracked records, confirming that most safety and compliance claims are made directly against bogie structure. B61K (railway auxiliary equipment) follows at 15, with smaller clusters in vehicle bodies, locomotives, force/pressure measurement, propulsion, brakes and track — evidence that safety qualification claims increasingly reach into adjacent subsystems rather than staying confined to the bogie frame itself.
Shares are the percentage of the 39 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Railway Bogie Safety and Compliance with Eureka
This page is one run against one query. Ask Eureka your own question about railway bogie safety and compliance and every answer comes back with the patent numbers behind it.
Try EurekaThe documents anchoring this landscape
Bogie for high-speed railway vehicle (US10011287B2)
A bogie for a high-speed railway vehicle includes a wheel set, an axle box, a primary spring suspension device, a frame, a secondary spring suspension device and a foundation braking device. A wheel of the wheel set has an LMA wheel tread. The foundation braking device is mounted by a three-point hitch structure. The axle box is a structure which is separatable in a vertical direction, and an off-line safety protecting device is mounted at a lower portion of the axle box. A traction rod of the secondary spring suspension device is a single traction rod, and a center pin is provided with an integral hoisting device.Filed by CRRC Qingdao Sifang, granted 2018-07-03, and among the most-cited records in this dataset.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20160362120A1 | Bogie for high-speed railway vehicle | 23 |
| 2 | CN201882114U | 用于检测城市轻轨钢轨的探伤车 | 17 |
| 3 | CN104442913A | 轨道车辆监测装置 | 14 |
| 4 | CN103359134A | 一种运行列车车辆转向架和底架成像及测温装置 | 14 |
| 5 | CN109484424A | 一种直线电机驱动的独立轮转向架 | 13 |
| 6 | US5351624A | Bogie for high-speed rail vehicles | 12 |
| 7 | EP3299247A1 | Bogie for railway vehicle | 11 |
| 8 | US6098551A | Twin-axle rail vehicle bogie | 7 |
| 9 | US20070079725A1 | Bogie for a rail vehicle | 6 |
| 10 | CN201395140Y | 米轨线路用铁路货车转向架 | 4 |
Citation counts reward older filings simply because they have had longer to accumulate citations inside this corpus; read them as a signal of influence on later filers, not as a measure of current commercial relevance.
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.
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Three patterns stand out once the raw counts are read against each other: where the claim density sits, how citation is distributed, and what the receiving-office split implies for where to search first.
Bogie structure carries the safety claim load
Nearly three-quarters of the dataset sits in B61F, the core running-gear subclass. Auxiliary equipment (B61K) is the next largest cluster at 15, meaning safety and compliance claims are written primarily against frame, suspension and wheelset structure, with auxiliary and monitoring equipment as a secondary but active claim surface.
China is the default forum for this niche
Two-thirds of tracked filings entered through the China receiving office, versus 7 in the United States and low single digits across the UK, Singapore, Canada and the EPO. A freedom-to-operate search that skips Chinese-language prior art will miss the bulk of the record here.
Active filing has paused, not accelerated
Every assignee tracked for recent-year momentum, from CRRC Qingdao Sifang to BYD to Kawasaki Heavy Industries, shows zero filings in the most recent year. Combined with the flat-to-declining trend since 2017, this points to a settled claim landscape rather than an emerging one — though the 18-month publication lag means the very latest activity is not yet visible.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to railway bogie safety and compliance, with the prior art for and against each one.
Who holds the ground, and where it thins out
The assignee base spans major rolling-stock manufacturers, research institutes and a long tail of single-filing entrants. Co-filing is rare in this dataset, which suggests most safety-qualification claims are being developed in-house rather than through joint research vehicles.
Established manufacturers anchor the core claims
CRRC Qingdao Sifang's high-speed bogie filing is among the most-cited records in the set, covering wheelset, axle-box and suspension safety features together in a single structural claim. BYD and Kawasaki Heavy Industries also appear in the assignee base, though none show filings in the latest tracked year.
Academic-industry pairing is present but thin
The single strongest co-assignee link pairs Central South University with the National Engineering Research Center for High-Speed Railway Construction Technology — a signal that some structural safety qualification work is being done jointly, but joint filings are the exception rather than the pattern across this dataset.
Most assignees appear once
Beyond the handful of manufacturers and institutes with multiple filings, most assignees in this dataset show a single tracked family. That long tail includes smaller engineering firms such as Chengdu Elite Automation Control Engineering, suggesting narrow, opportunistic filing rather than sustained portfolio building.
| Assignee | Recent year | YoY |
|---|---|---|
| CRRC Qingdao Sifang Co., Ltd. | 0 | -100% |
| BYD Company Limited | 0 | — |
| Kawasaki Heavy Industries, Ltd. | 0 | — |
| CRRC Luoyang Locomotive Co., Ltd. | 0 | — |
| Chengdu Elite Automation Control Engineering Co., Ltd. | 0 | — |
| CRRC Zhuzhou Electric Locomotive Co., Ltd. | 0 | — |
| Central South University | 0 | — |
| National Engineering Research Center for High-Speed Railway Construction Technology | 0 | — |
Turning this landscape into a filing or freedom-to-operate decision
The dataset shows where claim density already sits and where filings have gone quiet. The next step is testing a specific concept against that picture rather than reading the trend lines alone.
Map a specific bogie safety concept against the crowded B61F cluster
Run a targeted claim comparison against the densest structural safety filings before drafting, since nearly three-quarters of this dataset sits in a single IPC subclass.
Explore with Patsnap EurekaCheck Chinese-language prior art before filing in the US or Europe
With two-thirds of filings entered through the China receiving office, a search limited to English-language documents will systematically undercount prior art in this niche.
Search prior art in Patsnap EurekaRevisit the white-space branches for a first-mover filing
Sensor fusion, brake-to-bogie coupling and independent-wheel interlocks show low dedicated claim density relative to their IPC presence — worth a closer novelty check.
Run a white space analysis in Patsnap EurekaCommon questions about railway bogie safety patents
This dataset tracks 39 patent families filed between 2015 and 2026 that combine bogie-specific IPC codes with explicit safety or compliance language, such as derailment safety, running safety, or structural safety qualification. That is a narrow, safety-framed slice of the much larger bogie and running-gear patent universe, not a count of every bogie patent filed. Because the search requires safety or compliance terminology in the title or claims, purely mechanical bogie design patents without that language fall outside this count.
The trend is flat to declining. Filings peaked at 4 in 2017 and had fallen back to a midpoint of 1 by 2022, and every assignee tracked for recent-year momentum shows zero filings in the most recent year. That said, publication typically lags filing by about 18 months, so the last one to two years in any chart will always look thinner than the true filing activity turns out to be. The overall shape still points to a settled rather than expanding claim landscape.
China is the dominant receiving office in this dataset, accounting for 26 of the 39 tracked filings, well ahead of the United States at 7 and single-digit counts across the United Kingdom, Singapore, Canada and the European Patent Office. Anyone running a freedom-to-operate check in this space needs to search Chinese-language prior art directly rather than relying on English-language databases alone. The concentration also suggests that Chinese rolling-stock manufacturers and research institutes are the primary drivers of new filings in this niche.
The assignee base includes established rolling-stock manufacturers such as CRRC Qingdao Sifang and CRRC Zhuzhou Electric Locomotive, alongside BYD and Kawasaki Heavy Industries, plus research institutes like Central South University. Most assignees, however, appear with only a single tracked filing, forming a long tail of narrow or opportunistic entrants. Co-filing between organisations is rare, with only one notable co-assignee pairing in the entire dataset, pointing to mostly in-house rather than collaborative claim development.
US10011287B2, assigned to CRRC Qingdao Sifang, is one of the most-cited records in this dataset and claims a bogie structure combining a specific wheel tread type, a separable axle box with an off-line safety protecting device, a single traction rod suspension arrangement, and an integral hoisting device on the center pin. A new design that combines all of those specific structural elements in that configuration risks overlapping with this claim. Workable alternatives typically involve substituting individual elements, such as a different axle-box separation geometry or a different traction-rod arrangement, rather than replicating the full combination.
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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.