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 [electronic resource] / American Railway Association
Material type:
TextSeries: Project Gutenberg ; 45179Publication details: Project Gutenberg, 2014Online resources:
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Project Gutenberg | Available |
Public domain in the USA.
Electronic text
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