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The patented invention of the electric closed track circuit by Dr. William Robinson in 1872 gave the railroad industry its first means of automatic vital signaling. The track circuit is used to detect the presence of a train or a broken rail within a block of track. When an electric current traveling through the rails in a block of track is shorted by the presence of a train or interrupted by a break in the rail, a red signal indicates danger to approaching trains. When the track is clear, the closed circuit activates a green signal to indicate that approaching trains can enter the block. In 1878, Dr. William Robinson founded the Union Electric Signal Co. to hold his patents, to produce track circuits, and to install them. This technology continues to be a foundation of rail signaling and communications today.
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