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IPC Main Group
B61L 27/00

Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor

Introduced: September 1968

Last revised: January 2022

Classification Context

Section:
PERFORMING OPERATIONS; TRANSPORTING
Class:
RAILWAYS
Subclass:
GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC

9 direct subcodes

Child Classifications

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  • B61L 27/02 Manual systems
  • B61L 27/04 Automatic systems, e.g. controlled by train; Change-over to manual control
  • B61L 27/2 Trackside control of safe travel of vehicle or train, e.g. braking curve calculation
  • B61L 27/4 Handling position reports or trackside vehicle data
  • B61L 27/6 Testing or simulation
  • B61L 27/7 Details of trackside communication

Top Applicants

Top 10 applicants by patent filingsfor class B61, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SIEMENS MOBILITY DE 2,749
  2. CRRC QINGDAO SIFANG COMPANY 2,215
  3. SIEMENS DE 1,941
  4. ALSTOM TRANSPORT TECHNOLOGIES FR 1,514
  5. BYD COMPANY 1,371
  6. CRRC CHANGCHUN RAILWAY VEHICLES COMPANY 1,205
  7. CRRC ZHUZHOU LOCOMOTIVE COMPANY 1,165
  8. CRRC TANGSHAN COMPANY 1,119
  9. BOMBARDIER TRANSPORTATION DE 1,001
  10. SOUTHWEST JIAOTONG UNIVERSITY 958