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The railroad trackwork switch assembly of the present invention is essentially comprised of a relatively fixed conventional stock rail, a conventional switch point relatively movable into and out of abutting engagement with the stock rail, a target magnetic field source array, a controller housing element affixed to the switch stock rail and containing a Hall-effect sensor array, and electrical/electronic circuitry interconnecting the invention Hall-effect sensor array element to a power source and to an external switch closure condition signal visual display.