Based on the 248 mm (S248) of the straight line, the 3/4 186 mm straight line (S186), the 1/2 124mm straight line (S124), and UNITRACK shortest basic line · 62mm (S62) We are. We also line up 5 types of 64 mm straight line (S 64) that adjusts the distance between double tracks and line length when branching at points. Various special tracks are also made based on this standard.