B61L 27/00
Central railway traffic control systems
Official title: Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
B61L27/00 (Central railway traffic control systems) appears on 1,813 US grants and 2,336 published applications in this corpus.
Search patents in B61L- Granted patents
- 1,813
- Published applications
- 2,336
- Assignees
- 585
- Inventors
- 4,032
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 7 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 8 | 0 |
| 1996 | 3 | 0 |
| 1997 | 6 | 0 |
| 1998 | 7 | 0 |
| 1999 | 8 | 0 |
| 2000 | 9 | 0 |
| 2001 | 11 | 5 |
| 2002 | 16 | 22 |
| 2003 | 17 | 11 |
| 2004 | 13 | 27 |
| 2005 | 14 | 25 |
| 2006 | 19 | 30 |
| 2007 | 16 | 30 |
| 2008 | 12 | 20 |
| 2009 | 11 | 28 |
| 2010 | 23 | 33 |
| 2011 | 13 | 31 |
| 2012 | 33 | 43 |
| 2013 | 42 | 53 |
| 2014 | 52 | 99 |
| 2015 | 74 | 86 |
| 2016 | 83 | 176 |
| 2017 | 116 | 142 |
| 2018 | 96 | 128 |
| 2019 | 128 | 164 |
| 2020 | 122 | 159 |
| 2021 | 107 | 185 |
| 2022 | 110 | 160 |
| 2023 | 123 | 211 |
| 2024 | 175 | 178 |
| 2025 | 181 | 173 |
| 2026 | 119 | 117 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- B61L 27/50Trackside diagnosis or maintenance607
- B61L 27/10Operations480
- B61L 27/20Trackside control of safe travel of vehicle or train436
- B61L 27/40Handling position reports or trackside vehicle data410
- B61L 27/70Details of trackside communication367
- B61L 27/04Automatic systems283
- B61L 27/60Testing or simulation120
- B61L 27/30Trackside multiple control systems99
All 9 subgroupsShow fewer
Recent patents
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- Apparatuses, systems, and methods for monitoring moving vehicles8 Oct 2026US 2026/0307693 A1Georgia Tech Research Corporation
- Monitoring system and method8 Oct 2026US 2026/0307694 A1Transportation IP Holdings, LLC
- Personal transportation system8 Oct 2026US 2026/0307695 A1TPT Technologies, Inc.
- System and method for optimizing utilization of hostler resources of a hub based on a dual-stream resource optimization8 Oct 2026US 2026/0307696 A1BNSF Railway Company
- Vehicle system and method1 Oct 2026US 2026/0296509 A1Transportation IP Holdings, LLC
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By later US patents
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