View source for Boxpok

{{Short description|Type of steam locomotive wheel}}
{{single source|date=December 2024}}
[[File:Roues Boxpok 141-R-1199.jpg|thumb|Boxpok driving wheels]]
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 [[spoke]]s (the name is a variation on "box-spoke").  Being hollow, they allow better [[counterbalancing]] and stability  than conventional drivers, which is important for fast locomotives.  The Boxpok wheel was patented by [[General Steel Castings]] Corporation of [[Granite City, Illinois|Granite City]], [[Illinois]].

==Other wheels==
The Boxpok was the most common of the four disk wheels in use by US steam locomotive designers, the others being the Baldwin and Scullin. A fourth design, the Universal, was used in locomotive rebuilds. All vary slightly in appearance but are essentially the same in structure.{{sfnp|Lamb|2003|page= 180 }}

The term "Boxpok" is also sometimes used to describe the [[Bulleid Firth Brown wheel|Bulleid Firth Brown]] (BFB) wheel in use on British railways at that time, but this is incorrect; while the BFB is similar to the Boxpok, one side of each box section is left open, so is not a true box structure unlike the Baldwin, Boxpok and Scullin drivers.

==See also==
*[[SCOA-P wheel]]

==References==
{{Reflist}}

* {{Cite book
  |first=J Parker  |last=Lamb
  |title=Perfecting the American Steam Locomotive
  |year=2003
  |publisher=Indiana University Press
  |isbn=0253342198
  }}

{{Commons category|Boxpok wheels}}

[[Category:Train wheels]]


{{Steam-loco-stub}}

[[de:Eisenbahnrad#Boxpok-Räder]]