# E721 series

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Japanese train type

E721 / SAT721 / AB900 series E721-0 series (right) and the SAT721 series variant (left), August 2007 Manufacturers Kawasaki Heavy Industries, Tokyu Car Corporation, J-TREC Replaced 417, 455, 717 and 719 series Constructed 2006– Entered service February 2007 Number under construction 36 vehicles (9 sets) Number built 146 vehicles (63 sets) Number in service 142 vehicles (61 sets) Number scrapped 4 vehicles (2 sets, tsunami damage) Formation 2 or 4 cars per set Fleet numbers P1–P44, P501–P504, P4-1–P4-19, SA101–SA103 Operators JR East Sendai Airport Transit (SAT721) Abukuma Express (AB900) Depot Sendai Lines served Tōhoku Main Line Jōban Line Senzan Line Sendai Airport Line Abukuma Express Line Specifications Car body construction Stainless steel Car length 20,000 mm (65 ft 7 in) Width 2,950 mm (9 ft 8 in) Floor height 950 mm (3 ft 1 in) Doors 3 pairs per side Maximum speed 120 km/h (75 mph) Power output 125 kW (168 hp) per motor Electric system Overhead line, 20 kV 50 Hz AC Current collection Pantograph Bogies DT72 (motored), TR256 (trailer) Safety system ATS-Ps Multiple working 701 series Track gauge 1,067 mm (3 ft 6 in)

The **E721 series** ([Japanese](/source/Japanese_language): E721系) is an AC [electric multiple unit](/source/Electric_multiple_unit) (EMU) train type operated by [East Japan Railway Company](/source/East_Japan_Railway_Company) (JR East) on services in the [Sendai](/source/Sendai) area of [Japan](/source/Japan) since February 2007.

## Variants

- E721-0 series 2-car sets, since February 2007

- E721-500 series 2-car sets, since March 2007

- E721-1000 series 4-car sets, since November 2016

- SAT721 series 2-car sets, since March 2007 (owned by [Sendai Airport Transit](/source/Sendai_Airport_Transit))

- AB900 series 2-car sets, since July 2019

		- E721-0 series set P-4 in March 2007

		- E721-500 series set P-502 in November 2007

		- E721-1000 series set P4-14 in January 2017

		- SAT721 series set SA101 in December 2025

		- AB900 series set AB-1 on delivery at Zushi Station in February 2019

## Operations

- ■ [Banetsu West Line](/source/Banetsu_West_Line) (since March 2017)[1]

- ■ [Joban Line](/source/Joban_Line)

- ■ [Senzan Line](/source/Senzan_Line)

- ■ [Sendai Airport Line](/source/Sendai_Airport_Line) (E721-500 series and SAT721 series only)

- ■ [Tohoku Main Line](/source/Tohoku_Main_Line)

- ■ [Abukuma Express Line](/source/Abukuma_Express_Line) (AB900 series)

## Formations

As of 1 October 2015[\[update\]](https://en.wikipedia.org/w/index.php?title=E721_series&action=edit), the fleet consists of 42 two-car E721-0 series sets (P-2 to P-44), four E721-500 series two-car sets (P-501 to P-504), and three SAT721 series two-car sets (SA101 to SA103), formed as follows with one motored (Mc) and one trailer (Tc') car.[2]

### E721-0 series

Designation Mc Tc' Numbering KuMoHa E721-xx KuHa E720-xx

The KuMoHa cars have one PS109 single-arm [pantograph](/source/Pantograph_(rail)). The KuHa cars have a toilet.[2]

### E721-500 series

Designation Mc Tc' Numbering KuMoHa E721-50x KuHa E720-50x

The KuMoHa cars have one PS109 single-arm pantograph. The KuHa cars have a toilet.[2]

### E721-1000 series

The 19 four-car E721-1000 series sets (P4-1 to P4-19) are formed as follows, with two motored ("M") cars and two non-powered trailer ("T") cars.[3] The KuHa E720 is located at the southern end.[3]

Designation Tc' M T Mc Numbering KuHa E720-10xx MoHa E721-10xx SaHa E721-10xx KuMoHa E7210-10xx Weight (t) 34.3 32.0 37.2 39.1 Capacity (seated/total) 50/132 62/152 62/152 56/138

The two motored cars (KuMoHa and MoHa) each have one PS109 single-arm pantograph.[3] The KuHa cars have a toilet.[3]

		- The interior of car KuMoHa E721-1005 of set P4-5 in January 2017

		- An LED passenger information panel above the doorway in car KuMoHa E721-1005 of set P4-5 in January 2017

### SAT721 series

The two-car SAT721 series sets are formed as follows.

Designation Mc Tc' Numbering SAT721-10x SAT720-10x

The KuMoHa cars have one PS109 single-arm pantograph. The KuHa cars have a toilet.[2]

		- The interior of car SAT721-101 in April 2017

		- Priority seating and luggage space in car SAT721-101 in April 2017

### AB900 series

The [Abukuma Express](/source/Abukuma_Express) AB900 series are derived from the E721-500 and SAT721 series used for [JR East](/source/JR_East).

Sets are formed as follows.

Set Numbering AB-1[4] AB901-1 AB900-1 AB-2[5] AB901-2 AB900-2 AB-3[6] AB901-3 AB900-3 AB-4[7] AB901-4 AB900-4 AB-5[7] AB901-5 AB900-5

## History

The first E721-0 series sets were delivered from December 2006, and entered service on 1 February 2007 on [Tohoku Main Line](/source/Tohoku_Main_Line) services.[2] The first E721-500 and SAT721 series sets were delivered from February 2006 and entered service on Sendai Airport services on 18 March 2007.[2]

Two sets, P-1 and P-19, were derailed and badly damaged by the [2011 Tōhoku earthquake and tsunami](/source/2011_T%C5%8Dhoku_earthquake_and_tsunami) on 11 March 2011 while at [Shinchi Station](/source/Shinchi_Station). Both sets were [written off](/source/Total_loss) and scrapped.[2]

		- The remains of sets P-1 and P-19 at [Shinchi Station](/source/Shinchi_Station) after the tsunami in 2011

Intermediate cars for the first two E721-1000 sets on delivery from J-TREC Niitsu in September 2016

The first of a fleet of 19 new four-car E721-1000 sets (76 vehicles in total) was introduced on 30 November 2016[8] on [Tohoku Main Line](/source/Tohoku_Main_Line), [Joban Line](/source/Joban_Line), and [Senzan Line](/source/Senzan_Line) services, replacing older [719 series](/source/719_series) units.[9] The new trains are built by [J-TREC](/source/J-TREC), with construction shared between the company's Yokohama and Niitsu factories.[9] These trains feature LED interior lighting.[9]

The first four E721-1000 series intermediate cars were delivered from J-TREC's Niitsu factory to its Yokohama factory in September 2016 to be combined with driving cars built there.[10]

In order to replace their 8100 series trains, [Abukuma Express](/source/Abukuma_Express) announced the order of new AB900 series trains in summer 2018.[4] They are based on the E721 series,[11] and are the first new trains for Abukuma Express since 1988.[12] The first AB900 series set was delivered in February 2019.[4] It entered service on 1 July 2019.[12]

## Fleet/build details

The manufacturers and delivery dates for the fleet are as shown below.[2]

### E721-0 series

Set No. Manufacturer Date delivered Date withdrawn P-1 Kawasaki Heavy Industries 28 November 2006[13] 12 March 2011[Note 1] P-2 17 January 2007 P-3 P-4 P-5 Tokyu Car 18 December 2006 P-6 P-7 Kawasaki Heavy Industries 15 January 2007 P-8 6 February 2007 P-9 P-10 23 February 2007 P-11 P-12 Tokyu Car 15 January 2007 P-13 P-14 Kawasaki Heavy Industries 28 February 2007 P-15 P-16 8 March 2007 P-17 P-18 23 March 2007 P-19 23 March 2007[13] 12 March 2011[Note 1] P-20 23 March 2007 P-21 P-22 17 April 2007 P-23 P-24 27 April 2007 P-25 P-26 P-27 P-28 31 May 2007 P-29 P-30 P-31 P-32 6 July 2007 P-33 P-34 Tokyu Car 30 August 2007 P-35 P-36 26 September 2007 P-37 P-38 Kawasaki Heavy Industries 2 November 2007 P-39 P-40 13 September 2010 P-41 P-42 P-43 P-44

1. ^ [***a***](#cite_ref-tsunami_14-0) [***b***](#cite_ref-tsunami_14-1) Destroyed by tsunami on 11 March 2011.

### E721-500 series

The delivery of E721-500 series cars are as follows:[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

Set No. Manufacturer Date delivered P-501 Kawasaki Heavy Industries 17 February 2006 P-502 30 September 2006 P-503 P-504 Tokyu Car 25 October 2006

### E721-1000 series

All manufactured by [J-TREC](/source/J-TREC).

Set No. Date delivered P4-1 21 October 2016[14] P4-2 26 October 2016[14] P4-3 11 November 2016[14] P4-4 16 November 2016[14] P4-5 28 November 2016[14] P4-6 1 December 2016[14] P4-7 6 December 2016[14] P4-8 14 December 2016[14] P4-9 27 December 2016[14] P4-10 26 December 2016[14] P4-11 P4-12 P4-13 P4-14 P4-15 P4-16 P4-17 P4-18 P4-19

### SAT721 series

The three SAT721 series units being delivered in November 2006

All sets are manufactured by Kawasaki and delivered as of 20 November 2006.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

Set No. SA101 SA102 SA103

### AB900 series

All sets are manufactured by J-TREC.

Set No. Date delivered AB-1 21 February 2019[4] AB-2 February 2020[5] AB-3 25 January 2022[15] AB-4 AB-5

## See also

- [Aoimori 703 series](/source/Aoimori_703_series), a derivative for use on the [Aoimori Railway](/source/Aoimori_Railway)

- [Railway electrification in Japan](/source/Railway_electrification_in_Japan)

## References

1. **[^](#cite_ref-railfan20170309_1-0)** [磐越西線でE721系の運転開始](http://railf.jp/news/2017/03/08/180000.html) [E721 series enter service on the Banetsu West Line]. *Japan Railfan Magazine Online* (in Japanese). Japan: Koyusha Co., Ltd. 9 March 2017. [Archived](https://web.archive.org/web/20170309073145/http://railf.jp/news/2017/03/08/180000.html) from the original on 9 March 2017. Retrieved 9 March 2017.

1. ^ [***a***](#cite_ref-jrr2016_winter_2-0) [***b***](#cite_ref-jrr2016_winter_2-1) [***c***](#cite_ref-jrr2016_winter_2-2) [***d***](#cite_ref-jrr2016_winter_2-3) [***e***](#cite_ref-jrr2016_winter_2-4) [***f***](#cite_ref-jrr2016_winter_2-5) [***g***](#cite_ref-jrr2016_winter_2-6) [***h***](#cite_ref-jrr2016_winter_2-7) JR電車編成表 2016冬 [*JR EMU Formations – Winter 2016*] (in Japanese). Japan: Kotsu Shimbunsha. 18 November 2015. pp. 28–29. [ISBN](/source/ISBN_(identifier)) [978-4-330-62315-3](https://en.wikipedia.org/wiki/Special:BookSources/978-4-330-62315-3).

1. ^ [***a***](#cite_ref-railfan670_3-0) [***b***](#cite_ref-railfan670_3-1) [***c***](#cite_ref-railfan670_3-2) [***d***](#cite_ref-railfan670_3-3) One, Akihiro (February 2017). E721系1000番台 [E721-1000 series]. *[Japan Railfan Magazine](/source/Japan_Railfan_Magazine)* (in Japanese). Vol. 57, no. 670. Japan: Koyusha Co., Ltd. pp. 50–53.

1. ^ [***a***](#cite_ref-railfan21022019_4-0) [***b***](#cite_ref-railfan21022019_4-1) [***c***](#cite_ref-railfan21022019_4-2) [***d***](#cite_ref-railfan21022019_4-3) ["阿武隈急行AB900系が登場"](https://railf.jp/news/2019/02/21/230000.html) [Abukuma Express AB900 series appeared]. *Japan Railfan Magazine Online* (in Japanese). Japan: Koyusha Co., Ltd. 21 February 2019. [Archived](https://web.archive.org/web/20190811093358/https://railf.jp/news/2019/02/21/230000.html) from the original on 11 August 2019. Retrieved 11 August 2019.

1. ^ [***a***](#cite_ref-neko20022020_5-0) [***b***](#cite_ref-neko20022020_5-1) ["【JR貨】【阿武隈急行】AB900系第2編成を甲種輸送"](http://rail.hobidas.com/rmn/archives/2020/02/jrab9002.html) [(JR freight) (Abukuma Express) Transport of the second AB900 series set]. *rail.hobidas.com* (in Japanese). Neko Publishing. 20 February 2020. Retrieved 21 February 2020.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: deprecated archival service ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_deprecated_archival_service))

1. **[^](#cite_ref-6)** ["阿武隈急行AB900系AB-3編成が甲種輸送される"](https://railf.jp/news/2022/01/26/201500.html). *railf.jp*. 25 January 2022. Retrieved 26 January 2022.

1. ^ [***a***](#cite_ref-:0_7-0) [***b***](#cite_ref-:0_7-1) ["阿武隈急行AB900系4・5号車、3/18運行開始 - フリー乗車券限定発売"](https://news.mynavi.jp/article/20230316-2627128/) [Abukuma Express AB900 Series 4 and 5 Cars Commence Operation on March 18 - Unlimited Ticket Release]. *MyNavi Corporation* (in Japanese). 16 March 2023. Retrieved 18 March 2023.

1. **[^](#cite_ref-railfan20161209_8-0)** [E721系1000番台が営業運転を開始](http://railf.jp/news/2016/12/09/100000.html) [E721-1000 series enters revenue service]. *Japan Railfan Magazine Online* (in Japanese). Japan: Koyusha Co., Ltd. 9 December 2016. [Archived](https://web.archive.org/web/20170104075306/http://railf.jp/news/2016/12/09/100000.html) from the original on 4 January 2017. Retrieved 4 January 2017.

1. ^ [***a***](#cite_ref-jreast20160526_9-0) [***b***](#cite_ref-jreast20160526_9-1) [***c***](#cite_ref-jreast20160526_9-2) [E721系1000 代新造車両の投入について](https://web.archive.org/web/20200718093146/https://jr-sendai.com/upload-images/2016/05/e721-1000.pdf) [Details of introduction of new E721-1000 series trains] (PDF). *News release* (in Japanese). Japan: East Japan Railway Company Sendai Division. 26 May 2016. Archived from [the original](http://jr-sendai.com/upload-images/2016/05/e721-1000.pdf) (PDF) on 18 July 2020. Retrieved 27 May 2016.

1. **[^](#cite_ref-railfan20160923_10-0)** [E721系1000番台中間車が甲種輸送される](http://railf.jp/news/2016/09/23/120000.html) [E721-1000 series intermediate cars transported]. *Japan Railfan Magazine Online* (in Japanese). Japan: Koyusha Co., Ltd. 23 September 2016. [Archived](https://web.archive.org/web/20160923130709/http://railf.jp/news/2016/09/23/120000.html) from the original on 23 September 2016. Retrieved 23 September 2016.

1. **[^](#cite_ref-excite21022019_11-0)** ["阿武隈急行の新型車両AB900系電車が完成 JR貨物の「金太郎」にけん引されて福島へ"](https://www.excite.co.jp/news/article/Trafficnews_83733/) [Abukuma Express' new vehicle, the AB900 series train, is completed. Towed by JR Freight “Kintaro” to Fukushima]. *excite.co.jp* (in Japanese). Excite Japan Co., Ltd. 21 February 2019. [Archived](https://web.archive.org/web/20190811105138/https://www.excite.co.jp/news/article/Trafficnews_83733/) from the original on 11 August 2019. Retrieved 11 August 2019.

1. ^ [***a***](#cite_ref-minyu02072019_12-0) [***b***](#cite_ref-minyu02072019_12-1) ["『新型車両』始動！ＡＢ９００系 阿武隈急行、開業以来初導入"](https://www.minyu-net.com/news/news/FM20190702-392512.php) ["New vehicle" started! AB900 series Abukuma Express, first introduced since its opening]. *minyu-net.com* (in Japanese). The Fukushima Minyu Shimbun. 2 July 2019. [Archived](https://web.archive.org/web/20190811095545/https://www.minyu-net.com/news/news/FM20190702-392512.php) from the original on 11 August 2019. Retrieved 11 August 2019.

1. ^ [***a***](#cite_ref-jrr2010_13-0) [***b***](#cite_ref-jrr2010_13-1) JR電車編成表 2010夏 [*JR EMU Formations – Summer 2010*] (in Japanese). Japan: Kotsu Shimbunsha. May 2010. p. 25. [ISBN](/source/ISBN_(identifier)) [978-4-330-14310-1](https://en.wikipedia.org/wiki/Special:BookSources/978-4-330-14310-1).

1. ^ [***a***](#cite_ref-dj395_15-0) [***b***](#cite_ref-dj395_15-1) [***c***](#cite_ref-dj395_15-2) [***d***](#cite_ref-dj395_15-3) [***e***](#cite_ref-dj395_15-4) [***f***](#cite_ref-dj395_15-5) [***g***](#cite_ref-dj395_15-6) [***h***](#cite_ref-dj395_15-7) [***i***](#cite_ref-dj395_15-8) [***j***](#cite_ref-dj395_15-9) JR車両のうごき [JR rolling stock changes]. *Tetsudo Daiya Joho Magazine* (in Japanese). Vol. 46, no. 395. Japan: Kotsu Shimbun. March 2017. p. 127.

1. **[^](#cite_ref-16)** ["阿武隈急行AB900系AB-3編成が甲種輸送される"](https://railf.jp/news/2022/01/26/201500.html) [Delivery of Abukuma Express AB900 series set AB-3]. *Japan Railfan Magazine Online* (in Japanese). Retrieved 18 March 2023.

## External links

Wikimedia Commons has media related to ***[JR East E721](https://commons.wikimedia.org/wiki/Category:JR_East_E721)***, ***[SAT721](https://commons.wikimedia.org/wiki/Category:SAT721)*** and ***[Abukuma Kyuko AB900 series](https://commons.wikimedia.org/wiki/Category:Abukuma_Kyuko_AB900_series)***.

- [JR East E721 series](http://www.jreast.co.jp/train/local/e721.html) (in Japanese)

v t e Multiple-units of East Japan Railway Company Current / active Shinkansen AC EMUs E2 E3 E5 E6 E7 E8 Conventional lines (Narrow- gauge) DC EMUs Commuter E127 E129 E131 205 209 211 E231 E233 E235 Limited express 253 255 E257 E259 E261 E353 AC/DC EMUs Commuter E501 E531 Limited express E653 E655 E657 AC EMUs Commuter 701 719 E721 Limited express E751 BEMUs DC EV-E301 AC EV-E801 DMUs Diesel KiHa 40 KiHa 100/110 KiHa E120 KiHa E130 KiHa 141 Diesel-electric GV-E400 Hybrid MUs Commuter KiHa E200 HB-E210 HB-E220 Resort/deluxe trains E001 HB-E300 Non-revenue AC EMUs E926 "East-i" E956 DC EMUs 143 145 AC/DC EMUs E491 E493 DMUs Diesel KiYa E193 KiYa E195 Diesel-electric GV-E197 Future Shinkansen AC EMUs E10 Conventional lines AC EMUs E723 Fuel cell EMUs FV-E991 Retired / withdrawn Shinkansen AC EMUs 200 400 E1 E4 Conventional lines DC EMUs Commuter KuMoHa 12 KuMoHa 40 101 103 105 107 113 115 123 201 203 207 E217 301 Limited express 157 165 167 169 183 185 189 215 251 E351 AC/DC EMUs Commuter 403 415 417 453 455 457 Limited express 483 485 489 583 651 AC EMUs 715 717 DMUs KiHa 20 KiHa 30 KiHa 35 KiHa 37 KiHa 38 KiHa 45 KiHa 52 KiHa 58 KiHa 59 Non-revenue AC EMUs 925 STAR21 KuMoYa 740 KuMoYa 743 DC EMUs KuMoYa 90 193 901 E331 E993 AC/DC EMUs KuMoYa 441 443 KuYa 497 E991 DMU KiYa 191 Hybrid MU KiYa E991 DC BEMU E995 Experimental Fastech 360 E331

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Adapted from the Wikipedia article [E721 series](https://en.wikipedia.org/wiki/E721_series) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/E721_series?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.