A support including a rail (10) that preferably has an I-shaped section and is provided in a slot (2) filled with concrete (4). During the manufacture of the rail, the rail is partially coated, substantially along its entire length, with a filler material (8) which defines at least one side extension (16) and bears on the concrete. A side groove (9) is formed in the coating of filler material (8) for the passage of a guiding or rolling wheel. The rail is directly maintained by the concrete such that an intermediate device, for additional maintenance of the rail, is not required. The rail can be bent and curved at the time of installation to conform to the curves of the track without any independent or additional bending step.