Guide rail

(Railroads)

an additional rail, between the others, gripped by horizontal driving wheels on the locomotive, as a means of propulsion on steep gradients.- Knight.

guide rail

[′gīd ‚rāl] (civil engineering) A track or rail that serves to guide movement, as of a sliding door, window, or similar element.

A track that acts as a guide for a sliding window or door.

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