(EN) The railroad trackwork switch assembly (10) of the present invention is essentially comprised of a relatively fixed conventional stock rail (12), a conventional switch point (14) relatively movable into and out of abutting engagement with the stock rail (12), a target magnetic field source array (44, 46), a controller housing element affixed to the switch stock rail (12) and containing a Hall-effect sensor array (70, 72), and electrical/electronic circuitry interconnecting the invention Hall-effect sensor array (70, 72) element to a power source and to an external switch closure condition signal visual display.