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Wikipedia:
Rail or rails may refer to:
Railway transportationA generic term for railroads, railways, rail transport, and related mattersRail tracks, or railway lines, the running surface of a railwayRail profile, the cross sectional shape of a railway railThird rail, a method of providing electric power to a railway trainConductor rail, a structural steel surface fitted alongside a rail track to provide electrical power to the trainScience, technology, biology, and medicinePicatinny rail, a bracket used on some firearms in order to provide a standardized mounting platform for telescopic sights and other accessoriesRails or Rallidae, a family of birds which includes crakes, coots, and gallinulesRailing, a slang term for insufflation (medicine), whereby a substance, such as cocaine, is inhaled for recreational effectsStructural Guard rail, for protective separation of persons (including those in vehicles) from dangerous places or situationsHand rail, for physical support, such as on stairways and stepsTheatre rail, see batten (theater), from which lighting fixtures, theatrical scenery, tabs or curtains may be hungCurtain rail, see curtain, from which curtains are hungDoor rails, see frame and panel, a horizontal outside member on a door or in a frame and panel constructionElectrical engineering Power supply rail or voltage rail, a single voltage provided by a power supply unitOther usersCrayon Rails, the generic term for a board game which recreates the building of railroads via the use of crayonsRail (1967 short film), made by Geoffrey Jones for British Transport FilmsAn archaic term for sexual intercourseRuby on Rails, often shortened to "Rails" or "RoR", is an open source web application framework for the Ruby programming language