Whether on rail routes, at airports, or in the fi eld of energy supply, the availability of mo-dern systems largely depends on reliable power supply and transmission of information. In this context it is important that a multitude of sen-sitive cables are effi ciently protected against outside infl uences. The elevated GRP cable duct system off ers reliable protection against foreign infl uences and was designed for dif-fi cult terrains. The elevated GRP cable duct system ARCOSYSTEM® Sizes 1 + 2 was desi-gned for topographically diffi cult terrains along the rails. Even in such conditions the laying of cables does not present a problem. ARCOSYSTEM® Size 1 has a usable inner cross sec-tion of 100 x 150 mm and ARCOSYSTEM® Size 2 250 x 150 mm. The elevated cable duct ARCOSYSTEM® Sizes 1 + 2 allows a maxi-mum distance of 6 metres between the sig-ma posts. Therefore a structural analysis was done and rechecked by an inspecting structur-al engineer. The GRP cable duct is extremely light, yet solid due to the double-walled con-struction of the base. The lid snaps in to the base and can only be opened with an accuratetool.