File:Track circuit Robinson 1874.jpg

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current04:20, 6 September 2011Thumbnail for version as of 04:20, 6 September 20111,296 × 746 (686 KB)commons>Caseyjonz{{Information |Description={{en|1=Illustration of railroad track circuit invented by Dr. William Robinson in 1872, from his circular of January 1874. Legend:<br /> C-Primary signal. E-Magnet. H-Line wire circuit. I-Track battery. K-Pri

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