the c151b trains is the fourth commuter type electric multiple unit (emu) made in japan to feature electric systems fully manufactured by fuji electric. propulsion is controlled by vvvf inverter with 2-level igbt semiconductor controller, rated at 415 kva. each inverter unit controls two motors on one bogie (1c2m), and one motor car features two of such units. motors are three-phase ac induction type, model mlr109, with a maximum output of 140 kw.