These early suburban units, constructed between 1925 and 1937 were therefore designated 3-SUB, or later 4-SUB, depending on the number of coaches.
Ранние пригородные , построенные с 1925 по 1937 годы имели код 3-SUB, а затем 4-SUB (от английского "suburban"), в зависимости от количества вагонов.