Kato 3-510 24 series 25 type (HO) 24 series 25 type 4-car setKato 3 510 24 series 25 type (HO) 24 series 25 type 4 car set Kato 3 510 24 series 25 type (HO) 24 series 25 type 4 car set In 1974, the New Blue Train 24 series 25 type, which adopted a two stage B sleeper, was born to improve comfort and save labor. It features a stainless steel decorative band on the body of Blue No. 20. In 1976, the A sleeper Orone 25 type, which is a private room for one person, and the 100 series, which has a fixed upper bed for