In January 2004 work started on the West Coast Mainline Route Modernisation project. Part of the project was the reinforcing of the embankment at the infamous Train Robbers Bridge, Ledburn.

Network Rail and main contractor Balfour Beatty were looking for an economic and effective solution to the problems of burrowing animals undermining the embankment and potential soil erosion on the steepened slopes. The solution had to be effective and easily installed next to a high speed electrified rail line, robust to prevent burrowing animals and fire retardant in the event of sparks or vandals attempting to set fire to the fibres.

The answer was Greenfix F3 Rockmat a composite of fire retardant sea grass fibres woven into a thick blanket stitched to an anti-vermin galvanised wire mesh. The unique sea grass fibres of European origin are naturally fire retardant and 100% biodegradable within 36-60 months. The blanket is of sufficient density to prevent erosion of the underlying soils and promote the establishment of grasses for long term protection. The upper steel mesh layer provides a highly effective anti-vermin protection layer where rabbits and foxes etc are likely to create slope instability due to burrowing activities.


The slopes were re-graded as a result of the installation of new signalling posts and gantries. 75mm of top soil was placed on the embankment by sub-contractor Joywheel. Greenfix sourced a native grass seed mix which was sewn under the F3 Rockmat as it was installed.

The F3 Rockmat is easily manageable at 25Kg per 30sqm roll. An anchor trench sufficient to prevent burrowing under the blankets was dug at the top and bottom of the slope and Greenfix 300mm timber stakes used to pin the matting to the subsoil. In less than five weeks of installation the embankment was fully vegetated. The grasses grow through the fibres, enveloping the mesh to produce a protected grass embankment reinforced by the mesh but which is visually attractive.

The new product range GREENFIX f3 combines all the benefits of Covamats, Eromats, Mulchmats, Rockmats and GREENFIX 75 and provides additional fire protection according to DIN 4102-1.

The quickest way to contact us and learn about what we can offer is by telephone:

Geoweb Range: 01642 888693 Greenfix Range: 01608 664753 or visit www.greenfix.co.uk