721 series

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721 series
Set F-4103, August 2024
In service	1988–Present
Manufacturer	Hitachi, JR Hokkaido, Kawasaki Heavy Industries, Tokyu Car
Constructed	1988–2003
Scrapped	2023–
Number built	135 vehicles (34 sets)
Number in service	126 vehicles (31 sets)
Formation	3/6 cars per trainset
Operators	JR Hokkaido
Depots	Sapporo
Lines served	Hakodate Main Line, Chitose Line
Specifications
Car body construction	Stainless steel
Car length	21,670 mm (71 ft 1 in) (end cars) 21,300 mm (69 ft 11 in) (intermediate cars)
Width	2,954 mm (9 ft 8.3 in)
Height	4,090 mm (13 ft 5 in)
Doors	3 per side
Maximum speed	130 km/h (81 mph)
Traction system	Thyristor drive (1st-5th batch) GTO–VVVF (6th-7th batch) IGBT–VVVF (8th batch)[1]
Electric system(s)	20 kV 50 Hz AC (overhead line)
Safety system(s)	ATS-DN
Multiple working	731 series, 733 series, 735 series
Track gauge	1,067 mm (3 ft 6 in)

The 721 series (721系) is an AC electric multiple unit (EMU) operated by Hokkaido Railway Company (JR Hokkaido) on Sapporo area suburban services in Hokkaido, Japan since 1988.^[2]

The trains were built jointly by Hitachi, JR Hokkaido (Naebo Factory), Kawasaki Heavy Industries, and Tokyu Car (Yokohama).^[3]

As of 1 April 2012, the fleet consists of 135 vehicles, formed as 23 3-car sets and 11 6-car sets.^[4]

• 721-0 series
• 721-1000 series
• 721-2000 series
• 721-3000 series
• 721-4000 series
• 721-5000 series

Withdrawals of the 721 series commenced in 2023 with 721-3000 series set F-3016 being scrapped as of August.^[5] This continued the following year with sets F-4 and F-3015 being sent to Naebo for scrapping in April 2024.^[6][7]

In April 2024, JR Hokkaido announced that it will replace the 721 series with additional 733 series trains on Chitose Line Airport services.^[8]

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