The KATO (HO) Unitrack track system, which has gained popularity as the definitive version of the track system with trackbed, has three types of straight tracks (S60, S94, S227) for adjustment to enhance the layout plan, and the lineup has been enhanced. Did. This makes it possible to adjust the horizontal dimensions of the straight line S246 at 22.5 (67.5) ° when endlessly assembled with curves of different radii. (HO) Unitrack is easier to use and expands the range of layout planning.