The Mitsubishi Electric propulsion system was retained, having performed better than expected. The wheelchair space was made available on the end of two mid-train cars, nearest to the elevators in elevated stations. LED lights that blink to warn passengers of closing doors were introduced in the upper middle section of the door. Additional loudspeakers and advertisement panels were also introduced. Hand grips were moved to the support bars of the seats on the ceiling and grabpoles were located near the doors and at both ends of each car. The air-conditioning system was modified to match the system used in the C751B cars, with air-conditioning vents and in-flow fans installed.