Railway switches and signals – Block-signal systems – Automatic
Patent
1975-01-24
1976-02-10
Blix, Trygve M.
Railway switches and signals
Block-signal systems
Automatic
246 34R, B61L 2106
Patent
active
039374270
ABSTRACT:
In a railroad interlocking, a cab signal transmitter is coupled to the rails at each exit location and at such other locations as are necessary to supply continuous cab signal energy to trains traversing any possible route through the interlocking. Where train shunts prevent the reception of cab signal energy, wire loops laid adjacent the rails carry the cab signal energy for train pickup. Each rail coupled transmitter is finally activated to supply energy when a train occupies an associated track section. However, the control circuit network for each transmitter also checks, as pertinent for the established route, that a route has been established and the approaching train authorized to traverse that route, that any succeeding track sections along the route are unoccupied, that the transmitter for a preceding section has been activated, and that transmitters for opposing or conflicting routes are not active. A loop transmitter is activated if the corresponding track stretch is included in the established route, the preceding transmitter is active, and the succeeding section is unoccupied. Thus, a train which overruns an entry signal receives no cab signal energy since neither a route nor train authority has been established. For similar reasons, a train which inadvertently enters a conflicting route receives no cab signal energy intended for the authorized train. Finally, if an insulated joint at the interlocking limits fails, a train waiting outside these limits cannot receive cab signal energy intended for a train traversing an established route.
REFERENCES:
patent: 2454249 (1948-11-01), Broadbent
patent: 2478601 (1949-08-01), Spray
patent: 2736795 (1956-02-01), Witmer
patent: 3524054 (1970-08-01), Smith
patent: 3526378 (1970-09-01), Thorne-Booth
Blix Trygve M.
Eisenzopf Reinhard J.
McIntire, Jr. R. W.
Westinghouse Air Brake Company
Williamson, Jr. A. G.
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