TERRAM PW9 – Geocomposite Trackbed Separator

Geocomposite Trackbed Separator - TERRAM PW9


 Geocomposite Trackbed Separator

TERRAM PW9 is a Robust Separator for trackbed, designed where the sub-grade soils are good but contain angular stone. This angular stone could damage a standard geotextile, so a robust geotextile that protects the separation function of the geotextile is essential.

TERRAM PW9 is a mechanically entangled robust separator/filter that provides protection from angular stone damage.

TERRAM geosynthetics provide solutions for permanent way applications where loss of rail track alignment caused by sub-grade erosion leads to costly maintenance and the complication caused by having to plan and temporarily close the track for its renewal.


A geosynthetic provides one or more of four functions when used in track-bed construction:

  • Separation to maintain the integrity of adjacent soil types i.e. prevent intermixing
  • Filtration to prevent leaching of soil particles
  • Drainage to allow the free passage of water
  • Reinforcement to provide additional strength

The use of geosynthetics to reduce or replace traditional layers is now an accepted part of track-bed construction and renewals around the world. When correctly specified and installed, geotextiles and geogrids are proven to:

  • Enhance track performance
  • Significantly extend design life
  • Reduce the time required to renew a specific length of track (or allow more to be renewed in a fixed time).
  • Reduce overall material costs


  • Engineered to provide additional strength to resist damage from large angular stone particles.
  • Manufactured from high tenacity UV stabilised virgin polypropylene fibres to provide long term durability in all soil types.
  • Manufactured using a randomly orientated web to provide completely isotropic properties.
  • Excellent uniformity with high permeability and low pore size for soil filtration.
Further Information

TERRAM PW9 Factsheet

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