Railway switches and signals – Block-signal systems – Automatic
Patent
1982-02-01
1983-11-15
Groody, James J.
Railway switches and signals
Block-signal systems
Automatic
246 34B, 246 34R, B61L 2100
Patent
active
044151349
ABSTRACT:
A railroad signal circuit includes a transmitter and a receiver which have a common connection to the track rails at one end of a signal block. There will be a similar transmitter and receiver at the opposite end of the signal block. A transmit/receive switch is connected in circuit with the transmitter and there is a code following element connecting the receiver to the transmit/receive switch and transmitter. The code following element comprises a Hall effect cell whose output is connected to the receiver.
REFERENCES:
patent: 3328581 (1967-06-01), Staples
patent: 3526378 (1970-09-01), Thorne-Booth
patent: 3582932 (1971-06-01), Chapman
Groody James J.
Safetran Systems Corporation
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