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rack rail

(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 of rack rail
First recorded in 1830-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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  • From this point until the other side of the Andes is reached part of the way is covered by the use of a rack rail.

    The Amazing Argentine John Foster Fraser

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