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4932614 Train communication system  
A communication system for a railway train has a proving circuit for proving conditions of the railway track ahead of the train. The proving circuit comprises a transponder associated with at least...
4723739 Synchronous rectification track circuit  
An improved audio frequency track circuit system utilizes a synchronous train detection arrangement and reduces the number of fixed code rate modulated carrier signals. As few as two carrier...
4723738 Railway track circuit for electrified territory including impedance bonds and insulated joints  
A center-fed track circuit arrangement for an electrified section of railroad track. A first and a second remotely located insulated joint defining the limits of the track circuit. A first...
4314306 Signal-powered receiver  
A self-powered receiver including a series resonant circuit tuned to the carrier frequency of a modulated carrier signal. A demodulator for detecting the envelope which switches a switching...
2854567 Railway traffic controlling apparatus  
Matches 1 - 5 out of 5