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E721 / SAT721 / AB900 series
E721-0 series (right) and SAT721 series (left), August 2007
Manufacturer	Kawasaki Heavy Industries, Tokyu Car Corporation, J-TREC (Niitsu and Yokohama)
Replaced	455 series, 417 series, 717 series, 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	2/4 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)
Depots	Sendai
Lines served	Tohoku Main Line Joban 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 per motor
Electric system(s)	20 kV AC (50 Hz) overhead catenary
Current collector(s)	Pantograph
Bogies	DT72 (motored), TR256 (trailer)
Safety system(s)	ATS-Ps
Multiple working	701 series
Track gauge	1,067 mm (3 ft 6 in)

The E721 series (E721系) is an AC electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) on services in the Sendai area of 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)
•    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 SA102 in March 2008
• AB900 series set AB-1 on delivery at Zushi Station in February 2019

Operations

• ■ Banetsu West Line (since March 2017)
• ■ Joban Line
• ■ Senzan Line
• ■ Sendai Airport Line (E721-500 series and SAT721 series only)
• ■ Tohoku Main Line
• ■ Abukuma Express Line (AB900 series)

Formations

As of 1 October 2015, 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.

E721-0 series

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

E721-500 series

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

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. The KuHa E720 is located at the southern end.

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

• 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.

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

• 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 AB900 series are derived from the E721-500 and SAT721 series used for JR East.

Sets are formed as follows.

History

The first E721-0 series sets were delivered from December 2006, and entered service on 1 February 2007 on Tohoku Main Line services. The first E721-500 and SAT721 series sets were delivered from February 2006 and entered service on Sendai Airport services on 18 March 2007.

Two sets, P-1 and P-19, were derailed and badly damaged by the 2011 Tōhoku earthquake and tsunami on 11 March 2011 while at Shinchi Station. Both sets were written off and scrapped.

• The remains of sets P-1 and P-19 at Shinchi Station after the tsunami in 2011

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

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.

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

Fleet/build details

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

E721-0 series

1. ^ Destroyed by tsunami on 11 March 2011.

E721-500 series

The delivery of E721-500 series cars are as follows:

E721-1000 series

All manufactured by J-TREC.

SAT721 series

All sets are manufactured by Kawasaki and delivered as of 20 November 2006.

AB900 series

All sets are manufactured by J-TREC.

See also

• Aoimori 703 series, a derivative for use on the Aoimori Railway
• Railway electrification in Japan

References

1. 磐越西線でE721系の運転開始 [E721 series enter service on the Banetsu West Line]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 9 March 2017. Archived from the original on 9 March 2017. Retrieved 9 March 2017.
2. ^ JR電車編成表 2016冬 [JR EMU Formations – Winter 2016] (in Japanese). Japan: Kotsu Shimbunsha. 18 November 2015. p. 28–29. ISBN 978-4-330-62315-3.
3. ^ One, Akihiro (February 2017). E721系1000番台 [E721-1000 series]. Japan Railfan Magazine (in Japanese). Vol. 57, no. 670. Japan: Koyusha Co., Ltd. p. 50–53.
4. ^ "阿武隈急行AB900系が登場" [Abukuma Express AB900 series appeared]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 21 February 2019. Archived from the original on 11 August 2019. Retrieved 11 August 2019.
5. ^ "【JR貨】【阿武隈急行】AB900系第2編成を甲種輸送" [(JR freight) (Abukuma Express) Transport of the second AB900 series set]. rail.hobidas.com (in Japanese). Neko Publishing. 20 February 2020. Archived from the original on 21 February 2020. Retrieved 21 February 2020.
6. "阿武隈急行AB900系AB-3編成が甲種輸送される". railf.jp. 25 January 2022. Retrieved 26 January 2022.
7. ^ "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" [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.
8. E721系1000番台が営業運転を開始 [E721-1000 series enters revenue service]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 9 December 2016. Archived from the original on 4 January 2017. Retrieved 4 January 2017.
9. ^ E721系1000 代新造車両の投入について [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 (PDF) on 18 July 2020. Retrieved 27 May 2016.
10. E721系1000番台中間車が甲種輸送される [E721-1000 series intermediate cars transported]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 23 September 2016. Archived from the original on 23 September 2016. Retrieved 23 September 2016.
11. "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" [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 from the original on 11 August 2019. Retrieved 11 August 2019.
12. ^ "『新型車両』始動！ＡＢ９００系 阿武隈急行、開業以来初導入" ["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 from the original on 11 August 2019. Retrieved 11 August 2019.
13. ^ JR電車編成表 2010夏 [JR EMU Formations – Summer 2010] (in Japanese). Japan: Kotsu Shimbunsha. May 2010. p. 25. ISBN 978-4-330-14310-1.
14. ^ 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.
15. "阿武隈急行AB900系AB-3編成が甲種輸送される" [Delivery of Abukuma Express AB900 series set AB-3]. Japan Railfan Magazine Online (in Japanese). Retrieved 18 March 2023.

External links

• JR East E721 series (in Japanese)

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