sentences:  These sets were classified 253-200 series, and included minor improvements over the original 253-0 and 253-100 series sets, such as LED destination indicators, conventional rotating seats in standard class, and 2+1 seating in Green Cars.63 coaches (21 trains in three-car formation) were manufactured in 1990 and entered service in 1991.The types of coaches were the KuRo 253 (Green Car driving trailer), MoHa 253 (trailer) and KuMoHa 252 (driving trailer) coaches.