@SteveH, I am aware of the wave propagation theory discussions such as what Adrian describes and read many of the manufacturer papers on TVS products and placement guidelines. I came to the conclusion that the absolute best place for the TVS is at the source of the transient, but in our layouts that can be "unpredictable", so next best is at the entrance points to sensitive electronics (inside the locomotive), but ultimately clamping somewhere instead of nowhere may be a reasonable compromise.
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