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What is Guard Rail??  
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Aug 18 2011 (20:36)

Entry# 624     
Begins Falls Rises ™
What is Guard Rail??

Aug 18 2011 (20:34)
Blog Post# 222792-14     
SMJ   Added by: Begins Falls Rises ™  Aug 18 2011 (20:36)
@Akshay: Re# 222792-0
Guard rail (check rail)... -->
A guard rail (check rail) is a short piece of rail placed alongside the main (stock) rail opposite the frog. These exist to ensure that the wheels follow the appropriate flangeway through the frog and that the train does not derail. Generally, there are two of these for each frog, one by each outer rail. Guard rails are not required with a "self-guarding cast manganese" frog, as the raised parts of the casting serve the same purpose. These frogs are for low-speed use and are
common in rail yards.
Sections of rail provided parallel to the rails of the track (on the inside) at road crossings, bridges, viaducts, etc., to guide the flanges of the train wheels, and, in case an axle is derailed, to prevent the derailed wheels from moving away from the track in order to limit the damage to the bridge or other structure, or to prevent derailments in places where extrication might be unusually difficult. They bear on the back of the wheel flange in situations where the other wheel on the same axle might have a tendency to leave the track. Apart from bridges and the like, these are also found opposite the 'V' of points and on very tight curves. They are also known as check rails. In IR documents, often the term 'check rail' is used for those provided at sharp curves, points, and level crossings (where the gap provided is smaller), and the term 'guard rail' is more commonly used for those used on bridges and viaducts (where the gap is larger).
GR - Also called checkrail Railways a short metal rail fitted to the inside of the main rail to provide additional support in keeping a train's wheels on the track.
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