SIGNALLING...WITHOUT POLE LINES?
As microwave eliminates pole lines, railroad signal departments are confronted with alternatives to their control circuits formerly carried on poles along with communications circuits. Alternatives include buried cable, coded track circuits and audio frequency track circuits. Outside factors may dictate that all, or combinations of any two of these, may have to be utilized for specific applications. The problem as applied to a specific track segment was the subject of a panel discussion at the AAR Communication and Signal Section meeting in 1977.
- Find a library where document is available. Order URL: http://worldcat.org/oclc/4175009
Murphy-Richter Publishing Company20 North Wacker Driver
Chicago, IL USA 60606
- Publication Date: 1978-1
- Pagination: p. 54-56
- TRT Terms: Block signal systems; Cables; Electric circuits; Microwaves; Signal devices; Track circuits; Underground structures; Underground utility lines; Utility poles
- Old TRIS Terms: Audio frequency track circuits; Block systems; Circuit design; Coded track circuits; Pole lines; Signal circuits
- Subject Areas: Operations and Traffic Management; Railroads;
- Accession Number: 00172016
- Record Type: Publication
- Source Agency: Progressive Railroading
- Files: TRIS
- Created Date: Mar 29 1978 12:00AM