(idiomatic) In working order, functioning properly. / In a train or on trains. / (horse racing) Racing toward the inside, near the fence that bounds the track.

(video games) Rail-based. / (video games, of a character or object) Constrained to travel along a preset fixed path. / Used other than figuratively or idiomatically: see on, rails.

A moulding applied to or recessed into the surface of a wall, and used to suspend hooks and cables attached to paintings, framed art or mirrors. The moulding is usually continuous around the room.

plural of rail gun

Alternative spelling of guardrail

The parallel steel rails on which a train runs.

(rail transport) A rail, most commonly used in the United Kingdom, with a head and foot nearly equal in cross-section, that is supported in cast iron chairs and secured by wedges or keys.

plural of rail car

plural of rail track

A complex of branching railway lines and other infrastructure in which locomotives and rolling stock are stored and rearranged.