The Lionel postwar 91 circuit breaker is excellent. Maximum current 6 amps. It is easy to install, just wire it between the A or D post on the ZW and the track lock on. It is a very fast acting magnetic circuit breaker. If there is a derailment, you will hear the circuit breaker snap and the red light go on. Fix the problem, push the reset button, and you are back in operation. It opens so fast you will not even see sparks at the derailment site. Lionel must have made a lot of them as there are still lots of them around, some still new in the box.
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