Whether on rail routes, at airports, or in the field of energy supply, the availability of modern systems largely depends on reliable power supply and transmission of information. In this context it is important that a multitude of sensitive cables are efficiently protected against outside influences. The elevated GRP cable duct system offers reliable protection against foreign influences and was designed for difficult terrains. The elevated GRP cable duct system ARCOSYSTEM® Sizes 1 + 2 was designed 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 section of 100 x 150 mm and ARCOSYSTEM® Size 2 250 x 150 mm. The elevated cable duct ARCOSYSTEM® Sizes 1 + 2 allows a maximum distance of 6 metres between the sigma posts. Therefore a structural analysis was done and rechecked by an inspecting structural engineer. The GRP cable duct is extremely light, yet solid due to the doublewalled construction of the base. The lid snaps in to the base and can only be opened with an accuratetool.