Rail or rails may refer to:
- Guard rail, for safety or support
- Handrail, on a stairway
- Rallidae, the group of birds called rails
- Rail tracks
- The hot rolled steel profiles used on rail tracks or Tramway tracks
- A third rail is a method of providing electricity to power a railway by means of continuous rigid conductor mounted alongside the railway track
- A third rail can also refer to a rail configuration allowing dual gauge railway
- Rail transport
- RAIL (magazine), a railroad-related periodical
- Rural Appalachian Improvement League, a non-profit corporation based in Mullens, WV
- Rail (theater), rail in theatrical lighting
- Power supply rail, a voltage rail. A single voltage provided by a power supply unit
- Common rail, a fuel injection system
- Crayon Rails, the Mayfair Games board games
- Ruby on Rails, a web framework for the Ruby programming language
- A horizontal outside member on a door or in a frame and panel construction
- Picatinny rail, a bracket used on some firearms in order to provide a standardized mounting platform for telescopic sights and other accessories
- To insufflate a substance, such as cocaine, for recreational effects
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