- railway electrification; - protection of track and proximity installations; - railway electrifications in tunnels, on canopies, and large bridges; - rehabilitation of existing electrification installations; - lighting of point area in stations; - point heating; - tram electrification; - tram aerial contact line rehabilitation; - subway aerial contact line rehabilitation; - works for adaptation of electrification installations at interventions and repairs of lines and art works; - adaptation of electrification installations at construction of art works which overcross the railway.