Railway switches and signals – Block-signal systems – Automatic
Patent
1976-01-16
1977-05-10
Kunin, Stephen G.
Railway switches and signals
Block-signal systems
Automatic
246134, B61L 1916
Patent
active
040224074
ABSTRACT:
Separate traffic and block clear indication line circuits control either direction train movements through a stretch of track under cab signal indications without intermediate wayside signals. Reversible phase sensitive track circuits provide train detection and cab signal energy. A block clear, opposing locking repeater relay and a traffic route request relay at the selected entrance end of the stretch control the traffic line circuit to initiate traffic reversal operations. The magnetic stick traffic relays are shunted by a back contact of a neutral line relay to protect against lock out of the traffic line circuit by external voltage surges. The direction of the block clear line circuit is established by the traffic relay position. This second line circuit also checks the track sections unoccupied, the opposing signal, and traffic locking conditions before energizing a block or super-clear relay at the entrance end of the traffic stretch. The super-clear relay provides a special proceed signal indication, when the regular entry signal is cleared, to authorize movement by a train with inoperative cab signals. Time delays are incorporated into the relay operations as required to assure the reversal of all traffic relays during a traffic reversal procedure in order to avoid lock out of the traffic line circuit.
REFERENCES:
patent: 2954463 (1960-09-01), Ihrie
patent: 3260842 (1966-07-01), Davison et al.
patent: 3286091 (1966-11-01), Ferm et al.
patent: 3907237 (1975-09-01), Staples
patent: 3937427 (1976-02-01), Buzzard
patent: 3937428 (1976-02-01), Elder
Kunin Stephen G.
McIntire, Jr. R. W.
Westinghouse Air Brake Company
Williamson, Jr. A. G.
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