Permanent Way Products


PW1 - trackbed separator, PW2 - trackbed robust separator,
PW4-LA - trackbed separator/reinforcement

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.

The traditional solution has been to use a sub-ballast and/or a graded-sand layer to prevent the upward movement of fine sub-grade particles. Some 25 years ago, the use of a simple geotextile was adopted to maintain separation between the adjacent sand/ballast layers – Terram PW1 geotextile.

Since then further geosynthetics have been developed for permanent way applications and employed to deal with related issues:

Terram PW2 geocomposite- a robust separator/filter incorporating a stiff net between two textile filter layersTerram PW4-LA is a composite formed from Terram 4000 and Tensar SS40LA geogrid. Tensar SS40 improves track life and performance by stiffening ballast laid over weak ground. The advantage of Terram PW4-LA is the speed at which a geotextile filter and grid reinforcement can be laid in a single pass with the beneficial effect on construction costs. The choice of Terram PW grade will depend on the sub-grade type & its strength.

TERRAM PW2 and Hydrotex geotextiles support rail tracks and ballast and have been installed for track renewals at Eccles Yard, Doncaster

TERRAM PW1 Geotextile separator was installed to prevent intermixing between the sand blanket and new ballast on track renewals at Standedge Rail Tunnel.

TERRAM PW1 geotextile installed at Scunthorpe Station to strengthen track bed quality and reduce further maintenance costs


TERRAM Railways
PW1 - Standedge Tunnel Track Support
PW1 Geotextitle for Scunthorpe Station
PW2 & Hydrotex - Network Rail Eccles Yard