Rail - AbsoluteAstronomy.com

Rail or rails may refer to:
Railway transportation

A generic term for railroads, railways, rail transport
Rail transport
Rail transport is a means of conveyance of passengers and goods by way of wheeled vehicles running on rail tracks. In contrast to road transport, where vehicles merely run on a prepared surface, rail vehicles are also directionally guided by the tracks they run on...

, and related matters
Rail tracks, or railway lines, the running surface of a railway
Rail profile
Rail profile
The rail profile is the cross sectional shape of a railway rail, perpendicular to the length of the rail.In all but very early cast iron rails, a rail is hot rolled steel of a specific cross sectional profile designed for use as the fundamental component of railway track.Unlike some other uses of...

, the cross sectional shape of a railway rail
Third rail
Third rail
A third rail is a method of providing electric power to a railway train, through a semi-continuous rigid conductor placed alongside or between the rails of a railway track. It is used typically in a mass transit or rapid transit system, which has alignments in its own corridors, fully or almost...

, a method of providing electric power to a railway train
Conductor rail, a structural steel surface fitted alongside a rail track to provide electrical power to the train

Science, technology, biology, and medicine

Picatinny rail
Picatinny rail
The Picatinny rail or MIL-STD-1913 rail or STANAG 2324 rail or a "Tactical Rail" is a bracket used on some firearms in order to provide a standardized mounting platform. A similar system is the Weaver rail mount.-Description:...

, a bracket used on some firearms in order to provide a standardized mounting platform for telescopic sights and other accessories
Rails or Rallidae
Rallidae
The rails, or Rallidae, are a large cosmopolitan family of small to medium-sized birds. The family exhibits considerable diversity and the family also includes the crakes, coots, and gallinules...

, a family of birds which includes crakes, coots, and gallinules
Railing, a slang term for insufflation (medicine)
Insufflation (medicine)
Insufflation is the practice of inhaling a substance. Insufflation has limited medical use, but is a common route of administration with many respiratory drugs used to treat conditions in the lungs and paranasal sinus .The technique is common for many recreational drugs and is also used for some...

, whereby a substance, such as cocaine, is inhaled for recreational effects
Structural
- Guard rail
  Guard rail
  Guard rail or guardrail, sometimes referred to as guide rail or railing, is a system designed to keep people or vehicles from straying into dangerous or off-limits areas...
  
  , for protective separation of persons (including those in vehicles) from dangerous places or situations
- Hand rail
  Hand rail
  A hand rail may refer to:* A banister on a stairway* A handrail on a stairway* A guard rail for safety or security...
  
  , for physical support, such as on stairways and steps
- Theatre rail, see batten (theater)
  Batten (theater)
  In theater, batten refers to a long metal pole suspended above the stage or the audience from which lighting fixtures, theatrical scenery, tabs or other curtains may be hung...
  
  , from which lighting fixtures, theatrical scenery, tabs or curtains may be hung
- Curtain rail, see curtain
  Curtain
  A curtain is a piece of cloth intended to block or obscure light, or drafts, or water in the case of a shower curtain. Curtains hung over a doorway are known as portières...
  
  , from which curtains are hung
- Door rails, see frame and panel
  Frame and panel
  Frame and panel construction is a woodworking technique often used in the making of doors, wainscoting, and other decorative features for cabinets, furniture, and homes...
  
  , a horizontal outside member on a door or in a frame and panel construction
Electrical engineering
Electrical engineering
Electrical engineering is a field of engineering that generally deals with the study and application of electricity, electronics and electromagnetism. The field first became an identifiable occupation in the late nineteenth century after commercialization of the electric telegraph and electrical...
- Power supply rail or voltage rail, a single voltage provided by a power supply unit
Internal combustion engines
- Common rail
  Common rail
  Common rail direct fuel injection is a modern variant of direct fuel injection system for petrol and diesel engines.On diesel engines, it features a high-pressure fuel rail feeding individual solenoid valves, as opposed to low-pressure fuel pump feeding unit injectors...
  
  , a fuel injection supply system

Other users

Crayon Rails
Crayon rails
Crayon rails is the generic term for a board game which recreates the building of railroads via the use of crayons on a reusable wipe clean board...

, the generic term for a board game which recreates the building of railroads via the use of crayons
Rail (1967 short film)
Rail (1967 short film)
Rail is a short 13.5 minute documentary film made by Geoffrey Jones for British Transport Films between 1963 and 1967, prompted by the success of Snow...

, made by Geoffrey Jones for British Transport Films
An archaic term for sexual intercourse
Sexual intercourse
Sexual intercourse, also known as copulation or coitus, commonly refers to the act in which a male's penis enters a female's vagina for the purposes of sexual pleasure or reproduction. The entities may be of opposite sexes, or they may be hermaphroditic, as is the case with snails...
Ruby on Rails
Ruby on Rails
Ruby on Rails, often shortened to Rails or RoR, is an open source web application framework for the Ruby programming language.-History:...

, often shortened to "Rails" or "RoR", is an open source web application framework for the Ruby programming language
RAIL (magazine), a magazine on the subject of current rail transport in the United Kingdom
Rural Appalachian Improvement League
Rural Appalachian Improvement League
The Rural Appalachian Improvement League is a 501 non-profit corporation based in Mullens, West Virginia. Since 2001, when flooding devastated southern West Virginia, RAIL has worked to improve the quality of life for residents of the area...

(RAIL), a non-profit corporation based in Mullens, West Virginia, USA