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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.
Origin
1795-1805
1795-1805
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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