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Spoke Drivers

Cross section of an American drive wheel, from "The Engineer", July 1889.

Boxpok Drivers

A Boxpok driver is a steam locomotive driving wheel that gains its strength through being made of a number of box sections rather than having traditional solid spokes (the name is a variation on "box-spoke"). Being hollow, they allow better counterbalancing than conventional drivers, which is important for fast locomotives. The Boxpok wheel was patented by General Steel Castings Corporation of Granite City, Illinois.

UP 844 Boxpok Drivers