The phrase "a rail is" is correct and usable in written English.
It can be used when defining or describing something related to a rail, such as a physical rail or a metaphorical concept.
Example: "A rail is a long, narrow structure that provides support for trains."
Alternatives: "a track is" or "a bar is".
In this paper, the sound radiation from a rail is calculated using a method based on a combination of waveguide finite elements and wavenumber boundary elements.
The risk for initiation of fatigue cracks in the rail head and web in the weld zone of a rail is studied.
In this paper the influence of a velocity-dependent friction law on the interactions inside the contact patch between a rolling wheel and a rail is presented, assuming that the quasi-static approach is still applicable.
To allow repeatable and controllable experimental conditions for the prescribed disturbances, steel balls or a steel rod are used as the sources of the disturbances applied on the cantilever beam, on which a rail is cut out to guide the motions of the steel ball.
A rail is regarded as a Euler beam, and sleepers and ballast are regarded as rigid mass blocks.
Inability to walk up and down stairs without a rail is likely to be a clear indicator to an older person of their reduced function that influences their decision making.
Finally, the test of natural oblique cracks on a rail was conducted to validate the proposed methods.
Her tiny outfits, hanging on a rail, are cinched in at the waist, hugging a frame no longer there.
A rail was built around the seat for safety.
27 Inability to walk up and down stairs without a rail was a borderline significant factor associated with intent to undertake the falls clinic intervention.
A light rail is an urban mode of public transportation that generally has a lower capacity and speed then heavy rail and metro systems.
