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I do not know anything about the Silent Watchman.  But I have heard of something called a "wiggler valve" that was used on the N&W.  It monitored the locomotive oscillation in the vicinity of the pony truck, and set the air if the oscillation got severe enough to cause a derailment.  I am not sure if this was intended to only protect against the derailment of the pony truck or of the whole locomotive.  Was it common or very feasible for the pony truck of a steam locomotive to derail and then run on without derailing the whole locomotive?
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