System for selectively determining the location of a railway car

Details System for selectively determining the location of a railway car System for selectively determining the location of a railway car

1977-09-12

1979-05-01

Kunin, Stephen G.

Railway switches and signals

Train-position indication

Miniature model

246128, 246182A, B61L 2502, B61L 2932

Patent

active

041519698

ABSTRACT:
The velocity of a railway car travelling along a particular track can be determined by measuring the distance travelled by the car during a predetermined time interval. This distance travelled is measured by determining the location of the car with respect to a fixed point on the track at two different points of time. The determination of the location, in turn, is found by measuring the time period that it takes an electric signal applied at a fixed signal generating point to travel along the railway track and, once reaching the car, to be reflected back along the track to the signal generating point. By measuring the time delay between the applied signal and the reflected signal, the distance between the application point and the closest railway car on the track can be measured.

REFERENCES:
patent: 3305682 (1967-02-01), Bolster et al.
patent: 3342989 (1967-09-01), Dwyer et al.
patent: 3564488 (1971-02-01), Higashi et al.
patent: 3619604 (1971-11-01), Auer, Jr. et al.
patent: 3781543 (1973-12-01), Staples et al.

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