The Duchy of Blenshaf is one of apparently several places that produces gyro wheels[1]. The circus wagon in which Agatha identified one by its sound remained upright even though it had at most one set of wheels in a single straight line; thus, the gyro wheel referenced may have been a large flywheel which supplied gyrostabilization. Another example of a vehicle which would appear to require some such mechanism to remain upright is the Prisoner Transport seen later .


  1. Identified by Agatha.

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