Track monitoring device

Details Track monitoring device Track monitoring device

1980-01-24

1982-04-20

Groody, James J.

Railway switches and signals

Block-signal systems

Automatic

246 77, 246122R, B61L 2500, B61L 2700

Patent

active

043255248

ABSTRACT:
A railroad track monitoring device has a response device disposed at the front and end of every train, the response devices being capable of transmitting one of a number of different signals to a sampling device. The number of signals is at least twice as large as the number of trains on the system. The track is subdivided into a number of successive path segments and an interrogation device is disposed at the boundary of every two adjacent path segments. Each interrogation device has a memory allocated thereto for storing the last-received signal from a train passing the interrogation device, and a series of comparators for comparing the signals received from interrogation devices associated with adjacent track segments releases an occupied signal or a open track signal upon coincidence or difference of the most recently received information from the two track sections behind the front of the train.

REFERENCES:
patent: 3476932 (1969-11-01), Gittinger
patent: 3888437 (1975-06-01), Birkin
patent: 3907238 (1975-09-01), Sibley et al.
patent: 4128218 (1978-12-01), Pohlig

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