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rack rail

noun
1.
(in an inclined-plane or mountain-climbing railway) a rail between the running rails having cogs or teeth with which cogwheels on the locomotive engage.
Origin
1830-1840
1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for rack rail
  • The trains are fitted with one or more cog wheels that mesh with this rack rail.

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