Boxpok
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A Boxpok is a steam locomotive 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.
Bulleid Firth Brown (BFB) wheels designed by Oliver Bulleid and Firth Brown were a later variation through a separate patent where a lighter wheel was obtained by using a strengthened rim.
One of its major advantages over a spoked wheel is the more uniform support provided to the tyre.
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