Method of controlling a railroad car in automatic drive

Details Method of controlling a railroad car in automatic drive Method of controlling a railroad car in automatic drive

1982-01-26

1984-12-11

Caldwell, Sr., John W.

Railway switches and signals

Train-position indication

Miniature model

246 34R, 246 63R, 246167R, 340941, 340991, 340994, B61L 2500

Patent

active

044873859

ABSTRACT:
A voltage variation detector is connected to a receiver which is associated with a transmitter inducing an alternating signal permanently in the rails of a railroad track and, accordingly, in a conductive loop positioned between the rails. The respective variations of the voltage induced in the loop and of a feeding voltage to the loop furnish redundant information of the presence of a car in the transmission zone.

REFERENCES:
patent: 918537 (1909-04-01), Halvorsen
patent: 3333096 (1967-07-01), Ohman
patent: 3774025 (1973-11-01), Auer, Jr.
patent: 3821544 (1974-06-01), Matty
patent: 3879004 (1975-04-01), Andreasen
patent: 3891167 (1975-06-01), Perry
patent: 3907237 (1975-09-01), Staples
patent: 3979092 (1976-09-01), Perry
patent: 4325524 (1982-04-01), Krug
patent: 4351504 (1982-09-01), Frielinghaus
patent: 4373691 (1983-02-01), Fricke

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