A counterweight is provided for tensioning the wire of a catenary in a railway line, comprising a metal shell (1) made up of a frame (1a) and a surrounding body (1b) which is filled with a filler material (2), which integrates at least high-density concrete in combination with a metal material as an additional filler for increasing the density of the counterweight. The frame (1a) is embedded into the filler material (2) and in turn, is linked to the surrounding body (1b) by a welded joint.

An insulating support assembly for a catenary is adapted for powering an electrical vehicle. The assembly includes a base part adapted to connect the insulating support assembly to a section insulator of the catenary, a suspension insulator extending from the base part along a reference axis, and a suspension plate suitable to be hung to a supporting pole of the catenary. The suspension plate is connected to an upper part of and is movable relative to the suspension insulator.

An insulating support assembly for a catenary is adapted for powering an electrical vehicle. The assembly includes a base part adapted to connect the insulating support assembly to a section insulator of the catenary, a suspension insulator extending from the base part along a reference axis, and a suspension plate suitable to be hung to a supporting pole of the catenary. The suspension plate is connected to an upper part of and is movable relative to the suspension insulator.