Railway switches and signals – Block-signal systems – Automatic
Patent
1994-06-16
1995-11-14
Huppert, Michael S.
Railway switches and signals
Block-signal systems
Automatic
246122R, 34082554, B61L 2108, B61L 2322
Patent
active
054659264
ABSTRACT:
A coded railway track circuit apparatus is disclosed having the capability of operating during periods of low vehicle activity in a reduced power standby mode. This is accomplished by switching circuitry which interrupts power to most of the components within the track circuit apparatus in response to the recognition by standby initiation circuitry of a preselected standby initiation signal. Power to fail-over indicators which would normally be activated due to a power failure is also interrupted by fail-over interrupt circuitry. During the standby mode, monitor circuitry remains active to recognize occurrence of a preselected wake-up signal. When the wake-up signal is received, full power is restored, thus resuming normal operation. Operation of the fail-over systems is also then re-established.
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Dever Michael L.
Huppert Michael S.
Lowe Scott L.
Union Switch & Signal Inc.
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