PW2 and PW3.1 - geocomposite drainage trackbed separators

TERRAM PW2 and PW3.1 drainage geocomposites are trackbed separators designed for rail applications, used to separate ballast from subgrade while enhancing drainage.

PW2 is intended for use in wet conditions and on good sub-grade soils containing angular stone, while PW3.1 incorporates an impermeable side to act as a barrier between water and the formation where required.

Features and benefits

• Separates ballast from subgrade to prevent mixing and maintain track stability

• Enhances drainage in wet conditions or where a high water table exists (PW2)

• PW3.1 includes an impermeable membrane to create a water barrier where needed

• PW3.1 intercepts water and drains it laterally into side drains, maintaining dry sub-base conditions

• Reduces subgrade erosion and helps maintain rail track alignment

• Network Rail approved with PADS numbers

Applications

• Permanent way rail trackbed construction and maintenance

• Situations where subgrade erosion or water ingress may compromise track alignment

• Wet ground conditions or areas with poor drainage (PW2)

• Locations requiring a barrier between water and formation (PW3.1)

Materials

• PW2: HDPE geonet sandwiched between two layers of TERRAM PW1 geotextile

• PW3.1: black LDPE impermeable membrane, drainage net, and TERRAM PW1.0 geotextile

Accreditations

• Network Rail Acceptance certificates

• PADS numbers allocated

• Registered with RISQS (Railway Industry Supplier Qualification Scheme)

Specifications