Abstract: The multi-color traffic signal for railways comprises for each one of the three colors a projector unit consisting of a lamp, an optical unit and a chromatic filter. The projector units are connected to an irradiating output optics by means of an optical channel system consisting of a main rectilinear channel presenting at one end the irradiating output optics and at the other end a first projector unit in axial alignment with the main channel. A second and third projector units are housed in transverse channels at 90.degree. with respect to the main channel and open thereinto. A first dichroic mirror is arranged in the main channel with an angle of 45.degree. in correspondence with the outlet of the transverse channel of the second projector unit and a second dichroic mirror is arranged in the main channel with an angle of 45.degree. in correspondence with the outlet of the transverse channel of the third projector unit.

Abstract: A multi-color traffic signal in particular for railway line signalling installations, presents for each color a light source comprising a lamp, a collecting optical unit and a fixed chromatic filter. The light sources are connected by means of an optical fiber guide with an irradiating window surface constituting the output optics of the signal. The collecting optical unit comprises, arranged along a same optical axis and at opposite sides of the respective lamp, a curved focalized mirror and a spherical-elliptical lens, arranged so as to focalize the light flux of said lamp on the corresponding input of said optical fiber guide.