B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
B61L23/08—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only
B61L23/14—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only automatically operated
B61L23/16—Track circuits specially adapted for section blocking
B61L23/161—Track circuits specially adapted for section blocking using current of indifferent sorte or a combination of different current types
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Engineering & Computer Science
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Mechanical Engineering
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Train Traffic Observation, Control, And Security
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The Invention of the Track Circuit: The History of Dr. William Robinson's Invention of the Track Circuit, the Fundamental Unit which Made Possible Our Present Automatic Block Signaling and Interlocking Systems
The Invention of the track circuit: the history of Dr. William Robinson's invention of the track circuit, the fundamental unit which made possible our present automatic block signaling and interlocking systems