(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.
Words nearby rack rail
Origin of rack rail
First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Examples from the Web for rack rail
The cog-wheel on this latter shaft worked in a rack-rail placed in the centre of the track.Illustrated Catalogue of Locomotives|M. Baird, et. al..
He obtained a patent, in 1811, for the application of a rack-rail.The Steam Engine Explained and Illustrated (Seventh Edition)|Dionysius Lardner