Get some resettable circuit breakers for 6, 8 or 10 amp like the one shown below. Littlefuse makes them. Use one for each transformer output.
I installed them on my control panel and wire a 12 to 18 volt bulb (behind a red lens) across the circuit breaker contacts so the bulb comes on when tripped.
The circuit breaker reset button and red indicator light are shown in the upper left hand corner of the control board below.
Works for me. It is the same circuit that is used on a Marx circuit breaker device that is wired in between the transformer and the wire to the center rail of the track.
Charlie
