Whether it is over current or voltage spikes that kill digital control boards in trains, one cure for over current from track shorts is a fast acting circuit breaker. The fastest one I could find was the AirPax T-21-61 series circuit breakers. They actually have a chart on the Sensata web page for all the circuit breakers and the one that appears to give us the most protection would be the "fast" curve. It can trip in 100 milliseconds or up to one second. But you need to review the curves to get a less general spec that this.
http://airpax.sensata.com/pdfs/snapak.pdf
The Circuit Breaker in my MTH 100 watt power brick was so slow that the TIU fuses would blow before the power brick CB would break. Those are 20 amp fuses by the way and a bugger to get out as you have to take the sheet metal box cover off to get to them. This CB is as fast or faster than the Lionel180 watt power brick CB.
LDBennett
