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https://www.tensarinternational.com/Applications/Rail-Track-Support/
There are two ways in which Tensar geogrids can be used to stabilise railway trackbeds and maintain track alignment: Reinforcing the ballast layer with the large-aperture TriAx TX190L geogrid reduces ballast deformation and the rate of track settlement to …
Trackelast have specialised since 1946 in the manufacture of rail pads and other track support material to reduce ground borne vibration from rail track.
https://www.american-rails.com/ballast.html
Ballast also acts as a support base for the railroad track structure giving it strength and rigidity but also allowing for flexibility when trains pass over. Limestone or quartz is often most used as ballasting because it is a hard stone that will lock together providing for extra strength.
https://www.tensar.co.uk/Applications/Rail-Track-Support
There are two ways in which Tensar geogrids can be used to stabilise railway trackbeds and maintain track alignment: Reinforcing the ballast layer with the large-aperture TriAx TX190L geogrid reduces ballast deformation and the rate of track settlement to …
http://www.railtechnologymagazine.com/Comment/ballast-or-slab
In traditional railway track, the rails are supported and held apart by sleepers or ties, which rest on and are embedded in a coarse granular aggregate known as ballast.
https://web.engr.uky.edu/~jrose/papers/Track%20Design%20Introduction%20(Uzarski).pdf
• Ballast quality and ability to resist crushing forces (ballast degradation is the number 1 cause of ballast fouling) – Some railroads use different track modulus (u) values in design. For example, Spring u may be used for rail bending and ballast
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