As metal fatigues resistance increases. If the bar were to fatigue to breakage, electrical flow will cease. Hence a break in the circuit. II amnot sure if the Epcot loop is an entire single circuit, multiple single circuits, or multiple parallel circuits. In every configuration, resistance monitoring would indicate impending failure. Even nightly thermographic inspection would reveal impending failure. How difficult would it be to get a thermographic drone and program it to fly each monorail loop as a nightly pm program?