Signaling & Train Control Patents: Top Companies & Trends 2026
- 27.1% concentration at the top. The five leading assignees hold 919 of 3,397 records in scope, but the other 73% is spread across a long tail of filers.
- B61L dominates claim space. 77.0% of all records carry a Railway traffic control (B61L) classification, making it the densest single class to search before filing.
- Filing has cooled from its 2018 peak. Annual filings peaked at 228 in 2018 and fell 23% from 2021 (160) to 2024 (123), the last year with complete publication data.
Filing growth compares 2021 (160 records) with 2024 (123) — 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 3,397 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 3,397 published patent records filed against a search built around rail signaling, train control and related operational subsystems: train position sensing, wheel-contact detection, traction supply, track condition monitoring and railway operations. The scope spans 2015 through the 2026 data cut-off, though the most recent one to two years are understated because publication typically lags filing by around 18 months.
Records are drawn from filings at receiving offices spanning the United States, Europe, Japan, the WIPO PCT route, India and Australia, giving a view of where applicants are choosing to seek protection rather than only where they are headquartered.
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Filing trend and technology composition
Two views of the same 3,397 records: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
Filing trend, 2017-2026
Filings rose to a peak of 228 in 2018, then eased through the following years; the 2021-to-2024 span shows a 23% decline (160 to 123), the last year with complete publication coverage. 2025 and 2026 figures will continue to fill in as publication catches up.
IPC subclass composition
B61L (railway traffic control) appears on 77.0% of all records, by far the densest classification in scope. B60L (electric vehicle propulsion) and G06F (digital data processing) follow at 11.2% and 6.3% respectively, with wireless communication (H04W), braking (B60T), positioning (G01S), non-electric control (G05D) and commerce/admin data processing (G06Q) each present in single-digit shares. Because records often carry multiple classes, these figures sum to well over 100% of the record total.
Shares are the percentage of the 3,397 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Signaling & Train Control Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about signaling & train control patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaKey patents shaping this field
Methods and systems for decentralized rail signaling and positive train control
Systems and methods for decentralized rail signaling and positive train control using a network of wayside units placed on or near tracks and train-mounted units that communicate over ultra-wideband signals as trains come within range, generating control information for use in controlling train movement without reliance on a centralized control system.US20220140931A1, assigned to Metrom Rail, LLC, published 2022-05-05.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5129605A | Rail vehicle positioning system | 382 |
| 2 | US5623413A | Scheduling system and method | 374 |
| 3 | US5828979A | Automatic train control system and method | 343 |
| 4 | US5420883A | Train location and control using spread spectrum radio communications | 327 |
| 5 | US6135396A | System and method for automatic train operation | 285 |
| 6 | US5794172A | Scheduling system and method | 258 |
| 7 | US5398894A | Virtual block control system for railway vehicle | 234 |
| 8 | US20160221592A1 | Real Time Machine Vision and Point-Cloud Analysis For Remote Sensing and Vehicle Control | 230 |
| 9 | US20060005738A1 | Railroad vehicle with energy regeneration | 226 |
| 10 | EP1600351A1 | Method and system for detecting defects and hazardous conditions in passing rail vehicles | 215 |
Citation counts favour older filings simply because they have had more time to accumulate citations within the searched corpus; treat them as a signal of influence on the field, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three read-outs from the concentration, classification and citation data that matter for where to search and where to file next.
Leadership is real but not a lock
The five leading assignees account for 919 of the 3,397 records in scope, a meaningful concentration, but nearly three-quarters of filings sit outside that group. That long tail includes railway operators, signaling specialists and single-filing entrants working narrower problems than the incumbents.
B61L is occupied ground, not a blank search
More than three in four records classify under B61L, railway traffic control. Filing here means navigating dense prior art; the differentiation is more likely to come from combining B61L with a secondary class like G01S positioning or H04W wireless than from B61L claims alone.
Volume has eased from its 2018 peak
Filings peaked at 228 in 2018 and have declined since; the 2021-to-2024 window, the most recent stretch with complete publication data, shows a 23% drop from 160 to 123 filings. Read the 2025-2026 figures as provisional rather than as confirmation the field is shrinking further.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to signaling & train control patent landscape, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked leaders in this dataset span diversified electronics and rail-equipment majors, dedicated signaling specialists and, further down the list, railway operators themselves.
A diversified electronics incumbent leads
The top assignee holds 285 records, well ahead of fifth place at 126 and tenth place at 80 — a steep drop-off that suggests the leadership tier is thin even where concentration exists.
Corporate-group filings show up as co-assignee pairs
The strongest co-assignee pairs link a parent to its infrastructure-systems or R&D subsidiary, and a major electrical manufacturer to a named inventor, patterns consistent with internal group filing structures rather than external joint ventures.
Several established filers have gone quiet in the latest year
A number of the historically active assignees show zero or sharply reduced filings in the latest tracked year, a pattern consistent with the broader 18-month publication lag rather than necessarily a pullback in R&D activity.
| Assignee | Recent year | YoY |
|---|---|---|
| BNSF Railway Company | 1 | — |
| CASCO Signal Ltd | 1 | -80% |
| Mitsubishi Electric Corp | 0 | -100% |
| Hitachi, Ltd. | 0 | -100% |
| General Electric Company | 0 | — |
| Nippon Signal Co., Ltd. | 0 | — |
| QUANTUM ENGINEERING INC | 0 | — |
| Toshiba Corporation | 0 | — |
Where to take this from here
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, competitive tracking or identifying open claim space.
Search before filing in B61L
With 77.0% of records carrying a B61L classification, a freedom-to-operate search needs to go deep on this subclass specifically, not just the field generally.
Run a claim-level search in EurekaTrack the leadership tier's latest activity
Several top assignees show sharp year-over-year drops in the most recent tracked year; watching whether that continues past the publication lag matters more than a single year's count.
Set up assignee monitoring in EurekaTest claims in the under-claimed branches
UWB-based decentralized control and wheel-rail contact sensing show thinner coverage than the core traffic-control classes, worth a focused novelty search before drafting.
Explore white space in EurekaCommon questions about this landscape
The leading assignee in this dataset holds 285 of the 3,397 records in scope, with a steep drop to 126 at fifth place and 80 at tenth. Concentration exists at the top, but the top five combined account for only 27.1% of all records, meaning the majority of filings sit with a long tail of other companies, operators and specialists. Anyone assessing competitive position should look at both the leader's volume and the breadth of the tail rather than assuming one or two firms control the field.
Filings peaked at 228 in 2018 and have generally eased since. Looking at the most recent complete-year window, filings fell 23% from 160 in 2021 to 123 in 2024. Figures for 2025 and 2026 in the dataset are still understated because patent publication typically lags filing by about 18 months, so it is too early to read those years as a continued decline.
B61L, the IPC subclass for railway traffic control, appears on 77.0% of all 3,397 records, making it by far the densest classification in this field. B60L (electric vehicle propulsion) and G06F (digital data processing) are the next most common at 11.2% and 6.3% respectively. Because a single record can carry multiple classifications, these shares add up to well over 100% of the record total, which is expected rather than an error.
US20220140931A1, assigned to Metrom Rail, LLC and published in 2022, describes a decentralized rail signaling and positive train control system built on wayside units placed near tracks and train-mounted units that exchange ultra-wideband signals as trains come into range. Control information is generated locally from those UWB exchanges rather than relying on a centralized control system. Anyone working on decentralized or UWB-based positive train control should review this record's specific claim scope before designing a similar architecture.
Relative to the heavily claimed B61L core, sub-areas like UWB-based decentralized positive train control, wheel-rail contact condition sensing, and track-condition-linked traction supply management show comparatively thinner coverage in this dataset. That does not mean these areas are unclaimed, but that filing density is lower than in the core traffic-control classes, which is where a fresh claim has more room to stand out. A targeted novelty search in these specific branches is a more efficient starting point than searching the field broadly.
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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.