The invention refers to a profile for supporting at least one contact wire in an overhead railway electrification system. The profile has a cross section with a general shape similar to a reverse "Y": from an upper base (2) of the assembled profile, a first central span (3) descends which divides into at least two separated second spans (5, 6) whose free ends (7, 8) constitute the support means of the contact wire (200). <IMAGE>
1. A profile for supporting at least one contact wire in an overhead railway electrification system, said profile (1) being constituted by an electric conductor element extending in a longitudinal direction, said profile comprising support means of at least one contact wire (200), said profile having a cross section extending in a first direction between a first end corresponding to an upper base of the assembled profile, and a second end corresponding to the support means, the distance (a) between the first end and second end corresponding to the height of the assembled profile; and having, at said first end, a base (2) extending in a direction substantially perpendicular to said first direction and corresponding to the upper base of the assembled profile; characterized in that said cross section furthermore has a first central span (3) extending from said base (2) in said first direction and towards the second end, to a bifurcation point (4) where said first central span (3) divides into at least two separated second spans (5, 6) which extend from said bifurcation point (4) to said second end where each one of the second spans (5, 6) has a free end (7, 8), said free ends (7, 8) constituting the support means of said at least one contact wire (200). 2. A profile according to claim 1, characterized in that in the profile cross section, the first central span (3) has a length (b) in said first direction which corresponds to between 15% and 90% of the distance (a) between the first end and second end. 3. A profile according to claim 2, characterized in that said length (b) corresponds to between 25% and 70% of the distance (a) between the first end and second end. 4. A profile according to claim 3, characterized in that said length (b) corresponds to between 30% and 60% of the distance (a) between the first end and second end. 5. A profile according to claim 4, characterized in that said length (b) corresponds to between 35% and 50% of the distance (a) between the first end and second end. 6. A profile according to claim 5, characterized in that said length (b) corresponds to between 38% and 45% of the distance (a) between the first end and second end. 7. A profile according to any of the previous claims, characterized in that in the profile cross section, starting from the bifurcation point (4), each second span (5, 6) has a first portion extending in a first acute angle ( alpha ) with regard to the first direction. 8. A profile according to claim 7, characterized in that said first angle is between 20 DEG and 80 DEG . 9. A profile according to any of claims 7 and 8, characterized in that each second span (5, 6) has a second end portion (9, 10) inclined towards the second end and towards a line of symmetry of the cross section. 10. A profile according to any of the previous claims, characterized in that each one of two second spans (5, 6) is provided with a side projecting portion (11, 12) extending in a direction substantially perpendicular to said first direction and constituting coupling means for a carriage for insertion of the contact wire (200) into the support means. 11. A profile according to claim 10, characterized in that each side projecting portion (11, 12) has a free end, the distance between the free ends of the side projecting portions corresponding to a maximum profile width (c). 12. A profile according to claim 11, characterized in that the maximum width (c) is between 9 and 11 cm. 13. A profile according to any of the previous claims, characterized in that in the profile cross section, the base (2) has an extension in the direction perpendicular to the first direction whose magnitude corresponds to between 40% and 70% of the magnitude of the distance (a) between the first end and second end. 14. A profile according to any of the previous claims, characterized in that the base (2) represents between 15 % and 50 % of the profile weight. 15. A profile according to any of the previous claims, characterized in that the first central span (3) represents between 5 % and 20 % of the profile weight. 16. A profile according to any of the previous claims, characterized in that the distance (a) between the first end and second end is between 10 and 25 cm. 17. A profile according to claim 16, characterized in that the distance (a) between the first end and second end is between 14 and 16 cm. 18. A profile according to any of the previous claims, characterized in that it has two second spans (5, 6) and in that it is configured so as to support one contact wire (200), the free ends (7, 8) of the second spans (5, 6) being configured so as to be introduced into respective notches of the contact wire and to retain said contact wire like clips. 19. A profile according to any of the previous claims, characterized in that the electric conductor element is of metal. 20. A profile according to claim 19, characterized in that the metal is aluminum. 21. A profile according to any of claims 1-18, characterized in that the conductor element is composed of a plurality of elements of different materials.