The invention relates to a bearing including a rail (10) preferably having an I-shaped section and provided in a slot (2) filled with concrete (4). The rail is partially coated, during the manufacturethereof and essentially along its entire length, with a filler material (8) defining at least one side extension (16) bearing on the concrete and in which is formed a side groove (9) for the displacement of the guiding or rolling roller. The rail is directly maintained by the concrete without requiring the use of an intermediate device for an additional fixation. The rail can be curved upon laying in order to conform to the curves of the layout without any independent or additional bending step.