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center pin

noun Railroads.
  1. 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.
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Origin of center pin

First recorded in 1795–1805
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for center pin

Historical Examples of center pin

  • 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