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I conclude that the wiggler valve was not too common.  I have only heard of it being applied to N&W 4-8-0s.  It strikes me as a rather odd, but nevertheless practical solution to the problem of poor track and locomotive instability.  If the ride gets too rough, the wiggler valve dumps the air and stops the train in order to prevent the engine from derailing.  I wonder how much comfort engineers derived from this remedy for bad track.
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