A method for regenerating a frog of a worn railroad switch, characterised in that it comprises steps of: sectioning from a railway line or a tramline a portion of worn railroad switch which comprises: a first rail comprising a first wing rail and a first length of rail; a second rail comprising a second wing rail and a second length of rail which faces the first length of rail; a third rail comprising a third length of rail and a first end; a fourth rail comprising a fourth length of rail and a second end, the first end of the third rail and the second end of the fourth rail forming a point portion; the first wing rail, the second wing rail and the point portion forming the frog of the portion of worn railroad switch; removing the portion of worn railroad switch from the railway line or tramline; arranging the portion of worn railroad switch on a work plane in a position which is known with a degree of precision; identifying spatial coordinates of the actual tip of the point portion of the frog of the portion of worn railroad switch arranged on the work plane and spatial coordinates of other points of the portion of worn railroad switch arranged on the work plane so as to identify a profile and position of the point portion, the first wing rail and the second wing rail on the work plane; detecting at least a worn area at least in the point portion of the frog of the portion of worn railroad switch; removing material, automatically and by means of milling, from a work region which comprises the at least a worn area; adding welding material, automatically and by means of welding, in the work region from which material was removed by milling. sectioning from a railway line or a tramline a portion of worn railroad switch which comprises: a first rail comprising a first wing rail and a first length of rail; a second rail comprising a second wing rail and a second length of rail which faces the first length of rail; a third rail comprising a third length of rail and a first end; a fourth rail comprising a fourth length of rail and a second end, the first end of the third rail and the second end of the fourth rail forming a point portion; the first wing rail, the second wing rail and the point portion forming the frog of the portion of worn railroad switch; removing the portion of worn railroad switch from the railway line or tramline; arranging the portion of worn railroad switch on a work plane in a position which is known with a degree of precision; identifying spatial coordinates of the actual tip of the point portion of the frog of the portion of worn railroad switch arranged on the work plane and spatial coordinates of other points of the portion of worn railroad switch arranged on the work plane so as to identify a profile and position of the point portion, the first wing rail and the second wing rail on the work plane; detecting at least a worn area at least in the point portion of the frog of the portion of worn railroad switch; removing material, automatically and by means of milling, from a work region which comprises the at least a worn area; adding welding material, automatically and by means of welding, in the work region from which material was removed by milling.