Guard rail (rail)

In rail transport, guard rails or check rails are rails used in the construction of the track. placed parallel to regular running rail, and keep the wheels of rolling stock in alignment in case of derailment. They are generally used along areas of restricted clearance, such as a bridge, trestle, tunnel, or level crossing. They also helps to minimize damage to the structure and allows easier post-accident cleanup.

This article is about railway infrastructure. For highway infrastructure, see Guard rail.
Guard rails at Diêu Trì railway station, Vietnam
Track with guard rails in Myanmar, near Pekon

History

Although guard rails in some form have been used as long as there have been trains, the precursor of the guard rails we have today was detailed in U.S. Patent 522,038, filed in 1893 by Gorham B. Ames, based in Laconia, New Hampshire, USA.[1]

Sharp curves

On sharp curves, guard rails may be placed inside the inner rail, where they engage the back of the flange of the wheel on that side.[2]

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gollark: The point is that for one hashed input you always have the same output, so you can compare values without storing what they originally were.
gollark: Encryption means you can encrypt something with a key then decrypt it with that key (symmetric encryption, anyway), hashing means that you irreversibly convert it to a different value.
gollark: It's not encrypted, it's hashed.
gollark: Well, you probably would have to connect up to an external database somehow, yes.

References
  1. US 522038, Ames, Gorham B., "Guard-rail", issued June 26, 1894
  2. "Mildura Train Derailment". The Argus. Melbourne. 27 August 1928. p. 16. Retrieved 5 August 2011 – via National Library of Australia.


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