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center pin

noun, Railroads.
a cylindrical device passing through the center plates of both the body bolster and the truck bolster, permitting the truck to swivel beneath the car body while the stress is taken by the center plate.
Origin of center pin
1795-1805 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Historical Examples
  • It is made fast to the main rail by a screw, and upon it the wippen is hinged by means of a "center-pin" at the lower end.

    Piano Tuning J. Cree Fischer

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