Railway switches and signals – Cab signal or train control – Track trips
Patent
1997-06-25
1999-02-09
Morano, S. Joseph
Railway switches and signals
Cab signal or train control
Track trips
246249, 246293, 340341, 32420713, B61L 300
Patent
active
058683607
ABSTRACT:
A passive magnetic detector is provided at ground level or buried below ground level in between rails of a railroad trace at a distance from the level crossing for detecting magnetic field disturbances caused by ferromagnetic objects passing overhead on the track. Magnetic field reversals are detected in the passive detector signal. The reversal signal is analyzed and a train presence output signal is generated for controlling a level crossing gate system or other such crossing warning system. For parallel tracks, pairs of passive magnetic field detectors detect objects over each track and the reversals are analyzed to check that an inbound train does not sneak by undetected as an outbound train is leaving and passing over the same detector pair. At the level crossing, static magnetic field detectors are used to ensure that no equipment remains on the island after detecting that the moving train has left the crossing, so that the crossing gates can be safely lifted as soon as possible.
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Bader Clifford
De Renzi Charles
Morano S. Joseph
PrimeTech Electronics Inc.
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