Railway train speed restriction apparatus

Railway switches and signals – Cab signal or train control – Speed-control systems

Patent

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Details

246187R, 273435, B61L 308

Patent

active

051816792

ABSTRACT:
Apparatus for use in a train speed control system which meets speed control signals, known as code rate signals, into a track section and restricts the injection of other signals which would allow faster train speeds. The apparatus enables speeds to be restricted in sections of the track where maintenance crews are working or otherwise where necessary or desirable. The apparatus is adaptable for use with many different configurations of speed control signals as may be used by different rapid transit authorities. The apparatus has a speed restriction carrier printed circuit board which presents a first set of contacts along an edge thereof which may be at the end of a slot into which a speed restriction selection printed circuit board is insertable in a plurality of different positions (eight positions for a square board). The speed restriction selection board has a plurality of second sets of contacts, two sets sharing the same edge of the board. These second sets of contacts provide different combinations of connections between the first set of contacts thereby imposing selected speed restrictions on speed control signals which are carried by the speed restriction carrier board.

REFERENCES:
patent: 3072785 (1963-01-01), Hailes
patent: 3500388 (1970-03-01), Marsh et al.
patent: 3525044 (1970-08-01), Richmond
patent: 3927851 (1975-12-01), Wilcox
patent: 4217643 (1980-08-01), Anderson et al.
patent: 4234922 (1980-11-01), Wilde et al.
patent: 4279395 (1981-07-01), Boggio et al.
patent: 4307463 (1981-12-01), Sibley
patent: 4732355 (1988-03-01), Parker
patent: 5006989 (1991-04-01), Parker

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