(a) a guard rail on a bridge, esp. on a pedestrian or vehicular bridge, or on the bridge of a ship; (b) Railways a type of rail which, in cross…

a toothed rail which engages the teeth of a cogwheel, esp. on the locomotives of a rack railway.

(originally) train rails of lighter construction than is usual or standard; (hence) a railway system using such rails, and intended to carry limited…

a form of rail having flanges that rest on the ballast or straddle a longitudinal sleeper.

a railway metal or rail having a T section.

Mechanics. = rack rail n. at compounds.

A type of railway rail having wide, flat flanges at the base. Obsolete.

a tramway rail having teeth or cogs.

attributive, in the sense ‘shaped like the letter U’, as U-bend, U bolt, U cross profile, U-frame, U-magnet, U piece, U plate, U-rail, U-section…

a flat railroad rail laid upon a continuous longitudinal sleeper (Cent. Dict. 1891).

= guard-rail, n. 2.

a toothed rail used in railways with very steep gradients.