Railway dark territory switch automation
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United States of America Patent
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Oct 14, 2014
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N/A
app pub date -
Nov 10, 2008
filing date -
Jan 2, 2004
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Abstract
The invention provides a method for a railroad switch for use in un-signalized (dark) territory utilizing multiple audio messages for control and communication purposes to operate the railroad switch and relay its position to incoming trains. The messages are triggered by a programmable logic controller in conjunction with a dual tone multiple frequency signals.
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