Railway track circuits

Details Railway track circuits Railway track circuits

1992-10-16

1994-07-19

Bucci, David A.

Railway switches and signals

Block-signal systems

Automatic

246 34B, 246122R, B61L 2500

Patent

active

053301358

ABSTRACT:
A railway track circuit system is described, in which there is a transmitter 15,16 and receiver 19,20 at each end of a track circuit section 4. Each receiver receives signals from the transmitter at the opposite end of the section and the received signals are analyzed to determine whether a vehicle is present in the track circuit section. Where adjacent track circuit sections are also provided with a transmitter and a receiver at each of their ends, the transmitters 14,17 and receivers 18,21 at adjacent ends of adjacent track sections 3,5 can be connected to a track circuit unit 8,9 to allow that unit to check, when a vehicle appears to have left one track circuit section, that it has entered an adjacent section.

REFERENCES:
patent: 3575595 (1971-04-01), Pace
patent: 3666217 (1972-05-01), Sibley
patent: 3821544 (1974-06-01), Matty
patent: 3829682 (1974-08-01), Geiger
patent: 3868075 (1975-02-01), Blazek et al.
patent: 4074879 (1978-02-01), Clark et al.
patent: 4369942 (1983-01-01), Wilson
patent: 4415134 (1983-11-01), Wilson
patent: 4498650 (1985-02-01), Smith et al.
patent: 4619425 (1986-10-01), Nagel
patent: 5145131 (1992-09-01), Franke

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