(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 type of curtain rail having a slit along the length at the bottom in which gliders attached to pliable curtains can slide.

(obsolete) A loose robe worn as a nightgown.

A training device used for practicing skateboarding tricks, such as a grind or a board slide.

The transport of passengers and goods by means of wheeled vehicles specially designed to run on railways or railroads.

(simile, colloquial) Especially of a person, very skinny.

(US, Canada, rail transport) A kind of passenger railway in urban and suburban settings typically characterized by a mixture of tram (or in North America streetcar) and metro features, crossing streets at grade crossings and normally powered by electricity.

A rail, or system of rails (sometimes heated) in a bathroom, on which towels are hung to dry.

The electrified rail that runs beside or between train tracks to power electric trains. / (by extension) Anything that is dangerous to come into contact with, or is best avoided.