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As of 1 April 2012, the fleet consists of 135 vehicles, formed as 23 3-car sets and 11 6-car sets.[4]
Variants
721-0 series
721-1000 series
721-2000 series
721-3000 series
721-4000 series
721-5000 series
Withdrawal
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 LineAirport services.[8]
^"新車ガイド1：全室「uシート」化改造車とともに導入 721系8次車". 鉄道ファン. 43 (12). Koyusha: 64–69. 1 December 2003.
^JR全車輌ハンドブック2009 [JR Rolling Stock Handbook 2009]. Japan: Neko Publishing. 2009. pp. 312–318. ISBN978-4-7770-0836-0.
^Saka, Masahiro (March 2014). "JR第1世代の車両・現況と概要" [JR 1st-generation rolling stock: Current situation and overview]. Tetsudō Daiya Jōhō Magazine (in Japanese). 43 (359): 22.
^JR電車編成表 2012夏 [JR EMU Formations - Summer 2012]. Japan: JRR. May 2012. pp. 6–7. ISBN978-4-330-28612-9.
^"【もうそんな時代か…】721系の解体を開始【JR北海道】" [[Is it that time already?] Dismantling of 721 series begins [JR Hokkaido]]. RM News (in Japanese). Japan: Neko Publishing. 29 August 2023. Retrieved 24 April 2024.
^"【解体待ちか？】721系F-4編成苗穂工場入場" [[Awaiting demolition?] 721 series set F-4 entered Naebo factory]. RM News (in Japanese). Japan: Neko Publishing. 11 April 2024. Retrieved 10 May 2024.
^"【JR北海道】721系F-3015編成が苗穂工場へ廃車入場" [[JR Hokkaido] 721 series set F-3015 enters Naebo factory for scrapping]. RM News (in Japanese). Japan: Neko Publishing. 25 April 2024. Retrieved 10 May 2024.
^JR北海道、733系増備で721系置換え - 新幹線札幌開業後に速達化も [JR Hokkaido to replace 721 series with additional 733 series trains - Speeding up service after opening of Sapporo Shinkansen line]. Mynavi News (in Japanese). 4 April 2024. Retrieved 10 May 2024.
