WHEEL CHECKERS

RECORDING RELAY SYSTEMS AND APPARATUS FOR DETECTING DRAGGING EQUIPMENT, BROKEN FLANGES, AND DEFECTIVE WHEELS-NAMELY, BROKEN FLANGE DETECTORS, LOOSE WHEEL DETECTORS, DRAGGING EQUIPMENT DETECTORS, CLEARANCE DETECTORS, TRACK-SIDE RELAYS, RECORDERS, WHEEL MARKERS, AND AXLE COUNT READ-OUTS FOR ELECTROMECHANICAL DETECTION AND IDENTIFICATION OF DEFECTIVE EQUIPMENT ON RAILWAY ROLLING STOCK