721-5000 series -0 subseries -2100 subseries -3000 subseries -3100 subseries -4000 subseries -5000 subseries Type index
	JR Hokkaido built the intermediate cars classified into 721-5000 series in order to make 6-car formations with the addition of two surplus end cars of 721-1000 series in 2003. These end cars were also reclassified as 721-5000. 721-5000 series vehicles differ from the former 721 vehicles in discontinuing the vestibules and having the air curtains on doorways for preventing from open-air coming in. The window arrangement was changed because of discontinuing the windows at the door case. Traction system was changed into N-CI721-2. Traction motors were changed into N-MT731 rated at 230kW. Brake resistors are removed because of the change of brake system. The air conditioner was changed into N-AU722. Bogies are changed into N-DT721B/N-TR721B with which the top level of the bolster is made low. Now 721-5000 series are used on the "Airport" rapid services linking Otaru/Sapporo and New Chitose Airport.
	Technical Data Items Data Supply Voltage 20000VAC, 50Hz Service speed, etc. Acceleration: 2.4km/h/s Deceleration: 4.1km/h/s Service speed: 130km/h Length 20800mm Width 2954mm Height 3670mm Bogie N-DT721B (motored) N-TR721A, N-TR721B(trailer) Collector N-PS721B Traction motor N-MT785 (215kW) Gear ratio 5.19 Transformer N-TM721B Rectifier N-CI721A Traction system AVAF inverter: N-CI721A Air conditioner N-AU721 (20000kcal/h×1), N-AU731 (30000kcal/h×1) Designed by JR Hokkaido