Model railroaders who want to customize their tracks with ballast will turn to the Roco-Line track without embankment. Roco has a simple labeling system for the tracks. All tracks marked with "G" are multiples or parts of a straight track of 320 length. Tracks labeled "R" represent different radii. There is a distance of 61.6 from the center of the rail to the center of the rail of the radius that is "1" larger between each radius.