Drainage Trackbed Separators
PW2 and PW3.1 drainage geocomposites are used to separate the ballast from the subgrade with added drainage properties.
Frequently Asked Questions
Do you supply all rail drainage products?
Our distribution partners supply all rail drainage products including TERRAM geosynthetic materials. Please contact us for their contact details.
What are PADS numbers?
PADS (Parts and Drawing System) is Network Rail’s database of accepted products with numbers allocated to individual items or parts.
Are TERRAM products approved by Network Rail and TFL?
All TERRAM PW (Permanent Way), Standard Geotextiles hold Network Rail Acceptance certificates and have associated PADS numbers. TFL (Transport for London) and Network Rail require that all suppliers use of a qualification scheme called RISQS (Railway Industry Supplier Qualification Scheme). TERRAM (trading as Fiberweb Geosynthetics Ltd, part of the Berry Group) are registered with RISQS.
How do we cut the material of Rail Geosynthetics?
A4 Single layers of most TERRAM geosynthetic materials can be cut with sharp scissors or safety knives although regular changes of blades will be needed for long lengths. TERRAM Geocomposites such as PW4LA incorporate a reinforcing geogrid. The ribs of the geogrid mesh are square edged and up to 4mm thick, they can be cut with sharp shears or a disk cutter/angle grinder. Rolls can be trimmed with a petrol cut-off saw but suitable precautions should be taken to ensure the safety of the saw user and others in the vicinity. Wear appropriate personal protective equipment such as gloves and eye protection.
Do we overlap the material of Rail Geosynthetics?
The minimum overlap is 300mm but may be as much as 1.5m depending upon the ground conditions and product being installed. Please refer to the Network Rail Certificate of Acceptance and/or TERRAM specification, design and installation guidance for more details.