Curved uv mapping

[micheus]

Stem, that is valid for a regular mesh when the "tiles" (faces) have the same size/length (as in your example), so you can use circularize to fix any distortion as result of Cylindrical map or any other method.

By considering the mesh shown by DIEGONV40 (he's using the minimum amount of polygons to build the track), it's not a good idea to use circularize - he will lose the proportions among the track faces ("tiles").
Without the circularize - to equalize - the lengths, the map will be stretched in the curved areas.