Railway switches and signals – Cab signal or train control – Speed-control systems
Patent
1989-11-17
1991-12-24
Werner, Frank E.
Railway switches and signals
Cab signal or train control
Speed-control systems
246167R, 246187B, B61L 312
Patent
active
050744992
ABSTRACT:
A system for transmitting initialization information between fixed installations and trains. The system comprises: an initialization loop (bi) physically constituted in the same way as a speed monitoring loop; a speed monitoring coil (cd) which is also used for receiving initialization messages; a source of initialization messages (si) connected to the initialization loop and providing a message in the form of an initialization carrier wave having an initialization frequency modulated by frequency shift keying, with the level of the wave being considerably higher than the level of the carrier wave for speed monitoring; and circuits (di) for detecting initialization information, the circuits being connected to the speed monitoring coil and detecting the frequency shift keying in order to provide a received initialization message under the control of a switching device (ad, dp, sd, ri) which responds to reception of the initialization frequency solely when the frequency is at a level which exceeds a predetermined threshold.
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GEC Alsthom SA
Lowe Scott L.
Werner Frank E.
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