Machine for cutting metal sections, in particular for cutting railway line tracks, comprising at least one box-shaped frame arranged for enclosing: - motorized cutting means for cutting at least one metal section, said motorized cutting means comprising: - at least one contrasting cylinder and at least one breaking cylinder, said contrasting and breaking cylinders being configured for translating along their symmetry axes to engage said metal section so as to generate a breaking bending moment on said metal section for the bending failure of said metal section, and - at least one engraver adapted to make an engraving on said metal section, said engraving being adapted to facilitate the bending failure of said metal section, characterised in that said box-shaped frame contains: - a support and guiding strip arranged so that a single metal section can be at least partly rested thereon and can be guided towards said motorized cutting means, and - motorized holding means configured for pulling said metal section along said support and guiding strip, so as to advance said metal section by a predefined stretch of variable length and for holding said metal section during the cutting, said machine for cutting metal sections further comprising at least one shielding barrier configured for preventing the violent spreading of metal splinters due to the bending failure of said metal section. - motorized cutting means for cutting at least one metal section, said motorized cutting means comprising: - at least one contrasting cylinder and at least one breaking cylinder, said contrasting and breaking cylinders being configured for translating along their symmetry axes to engage said metal section so as to generate a breaking bending moment on said metal section for the bending failure of said metal section, and - at least one engraver adapted to make an engraving on said metal section, said engraving being adapted to facilitate the bending failure of said metal section, characterised in that said box-shaped frame contains: - a support and guiding strip arranged so that a single metal section can be at least partly rested thereon and can be guided towards said motorized cutting means, and - motorized holding means configured for pulling said metal section along said support and guiding strip, so as to advance said metal section by a predefined stretch of variable length and for holding said metal section during the cutting, - at least one contrasting cylinder and at least one breaking cylinder, said contrasting and breaking cylinders being configured for translating along their symmetry axes to engage said metal section so as to generate a breaking bending moment on said metal section for the bending failure of said metal section, and - at least one engraver adapted to make an engraving on said metal section, said engraving being adapted to facilitate the bending failure of said metal section, characterised in that said box-shaped frame contains: - a support and guiding strip arranged so that a single metal section can be at least partly rested thereon and can be guided towards said motorized cutting means, and - motorized holding means configured for pulling said metal section along said support and guiding strip, so as to advance said metal section by a predefined stretch of variable length and for holding said metal section during the cutting, - a support and guiding strip arranged so that a single metal section can be at least partly rested thereon and can be guided towards said motorized cutting means, and - motorized holding means configured for pulling said metal section along said support and guiding strip, so as to advance said metal section by a predefined stretch of variable length and for holding said metal section during the cutting,