Click below to consult the terms in the lexicon.

Geosynthetic material formed into a very open, gridlike configuration and used to reinforce soils below roads or structures. The key feature of all geogrids is that the openings between the adjacent sets of longitudinal and transverse ribs, called “apertures,” are large enough to allow for soil strike-through from one side of the geogrid to the other.

Permeable fabrics consisting of synthetic fibers which, in association with soil, have the ability to separate, filter, reinforce, protect or drain. They support many civil engineering applications including roads and railways.

Green wall

Wall covered in vegetation. This wall often consists of a pile of prefabricated elements, which are then filled with earth so that the vegetation can grow in it.


Set of track equipment (such as switching) covered by signals.


GSM for Railways. Digital communication network reserved for railway companies.