 Train 1-80 has always been ten cars long, trains 1-81 and 1-83 were originally eight cars long, and trains 1-85 and 1-86 utilized older trains as only two driving cars for each train were manufactured.Many additional cars were built to lengthen second generation trains 1-50~1-53 and 1-57~1-63, along with rebuilt train 1-82; trains 1-50~1-53 and 1-59~1-61 were lengthened to ten cars, while trains 1-57, 1-58, 1-62, and 1-63 were lengthened from four to six cars.Eight of the additional cars were retired in 2017 when second generation train 1-64 was retired, and eight more were retired in May 2020 when third generation train 1-74 was retired.