Rail transport

A third rail is a method of providing electricity to power a railway by means of continuous rigid conductor mounted alongside the railway track.

Rail tracks

A third rail can also refer to a rail configuration allowing dual gauge railway.

Rallidae, the group of birds called rails

Ruby on Rails, a web framework for the Ruby programming language

Common rail, a fuel injection system

A guard rail for safety or support

Flanged T rail

Rail (theater), rail in theatrical lighting

Picatinny rail, a bracket used on some firearms in order to provide a standardized mounting platform for telescopic sights and other accessories

Vignoles rail

Handrail on a stairway

Crayon Rails, the Mayfair Games board games

The hot rolled steel profiles used on rail tracks or Tramway tracks

RAIL (magazine), a railroad-related periodical.

Power supply rail, a voltage rail. A single voltage provided by a power supply unit.

A horizontal outside member on a door or in a frame and panel construction.