UNA- X3 , a self-propelled road-rail lorry, outstandingly designed for railroad electrification projects, ideal for construction of dropper adjustments and finishing in assistance to unrolling equipment or to other high capacity assembly equipment . Supports maintenance of interventions in central areas of the catenary system, along the cantilever up to the poles. The scissor-lift platform on X3 can support 2 independent baskets: a 1 m vertical extension allows the operator to work both on the contact wires and on cable support ,and the other equipped with an on slide with lateral offset of up to 2.90 m from the centre of the track to allow working on the pole. Retractable rail wheels for better maneuverability and flexibility of unloading near the track in all terrain-mode makes transportation between work shop and worksite with 18KM/hr speeds on tracks of lowered platforms easy.