[posted] Posted (#45179, American) !

[Al Haines]

The Invention of the Track Circuit, by American Railway Association      45179
  [Subtitle: 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]
  [Link: http://www.gutenberg.org/4/5/1/7/45179 ]
  [Files: 45179.txt; 45179-h.htm]

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Regards,
Al