E721 series

{{Infobox train

| name = E721 / SAT721 / AB900 series

| image = E721&SAT721.JPG

| imagesize = 300px

| caption = E721-0 series (right) and SAT721 series (left), August 2007

| service =

| manufacturer = Kawasaki Heavy Industries, Tokyu Car Corporation, J-TREC (Niitsu and Yokohama)

| factory =

| family =

| replaced = 455 series, 417 series, 717 series, 719 series

| yearconstruction = 2006–

| yearservice = February 2007

| refurbishment =

| yearscrapped =

| numberconstruction = 36 vehicles (9 sets)

| numberbuilt = 146 vehicles (63 sets)

| numberservice = 142 vehicles (61 sets)

| numberpreserved =

| numberscrapped = 4 vehicles (2 sets, tsunami damage)

| formation = 2/4 cars per set

| fleetnumbers = P1–P44, P501–P504, P4-1–P4-19, SA101–SA103

| capacity =

| operator = JR East
Sendai Airport Transit (SAT721)
Abukuma Express (AB900)

| depots = Sendai

| lines = {{Plainlist|

}}

| carbody = Stainless steel

| carlength = {{convert|20,000|mm|ftin|abbr=on}}

| width = {{convert|2,950|mm|ftin|abbr=on}}

| height =

| floorheight = {{convert|950|mm|ftin|abbr=on}}

| doors = 3 pairs per side

| maxspeed = {{convert|120|km/h|mph|abbr=on|round=5}}

| weight =

| acceleration =

| deceleration =

| traction =

| poweroutput = 125 kW per motor

| transmission =

| aux =

| powersupply =

| hvac =

| electricsystem = 20 kV AC (50 Hz) overhead catenary

| collectionmethod = Pantograph

| bogies = DT72 (motored), TR256 (trailer)

| brakes =

| safety = ATS-Ps

| coupling =

| multipleworking = 701 series

| gauge = {{RailGauge|1067mm|lk=on}}

}}

The {{nihongo|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

{{Color box|Green}}{{Color box|Red}} E721-0 series 2-car sets, since February 2007
{{Color box|Green}}{{Color box|Blue}} E721-500 series 2-car sets, since March 2007
{{Color box|Green}}{{Color box|DeepPink}} E721-1000 series 4-car sets, since November 2016
{{Color box|Blue}}{{Color box|DarkOrange}} SAT721 series 2-car sets, since March 2007 (owned by Sendai Airport Transit)
{{Color box|Silver}}{{Color box|SlateBlue}} AB900 series 2-car sets, since July 2019

File:JRE EC721-0 20070325 001.jpg|E721-0 series set P-4 in March 2007

File:JRE E721 500.JPG|E721-500 series set P-502 in November 2007

File:JR-East-E721-1000.jpg|E721-1000 series set P4-14 in January 2017

File:SAT-721.JPG|SAT721 series set SA102 in March 2008

File:Abukuma-kyuko-AB900-AB1-20190221-133537.jpg|AB900 series set AB-1 on delivery at Zushi Station in February 2019

Operations

{{Plainlist|

{{Colorbull|Sienna}} Banetsu West Line (since March 2017){{cite web |url= http://railf.jp/news/2017/03/08/180000.html |script-title=ja: 磐越西線でE721系の運転開始 |trans-title=E721 series enter service on the Banetsu West Line |date= 9 March 2017 |work= Japan Railfan Magazine Online|publisher= Koyusha Co., Ltd.|location= Japan|language= ja |archive-url= https://web.archive.org/web/20170309073145/http://railf.jp/news/2017/03/08/180000.html |archive-date= 9 March 2017 |url-status=live |access-date= 9 March 2017}}
{{Colorbull|Blue}} Joban Line
{{Colorbull|LightGreen}} Senzan Line
{{Colorbull|Blue}} Sendai Airport Line (E721-500 series and SAT721 series only)
{{Colorbull|DarkOrange}} Tohoku Main Line
{{Colorbull|SlateBlue}} Abukuma Express Line (AB900 series)

}}

Formations

{{As of|2015|10|01}}, 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.{{cite book |script-title=ja: JR電車編成表 2016冬 |trans-title=JR EMU Formations – Winter 2016 |publisher = Kotsu Shimbunsha |date = 18 November 2015 |location = Japan |language = ja |pages = 28–29|isbn = 978-4-330-62315-3}}

=E721-0 series=

class="wikitable"

Designation

| Mc || Tc'

Numbering

| KuMoHa E721-xx || KuHa E720-xx

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

=E721-500 series=

class="wikitable"

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.

=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.{{cite magazine|last = One|first = Akihiro|script-title=ja: E721系1000番台|trans-title=E721-1000 series|magazine = Japan Railfan Magazine |volume = 57|issue = 670 |pages = 50–53 |publisher = Koyusha Co., Ltd. |location = Japan |language = ja |date = February 2017| page= }} The KuHa E720 is located at the southern end.

class="wikitable"

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 || colspan="2" | 62/152 || 56/138

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

File:JR East E721-1000 series P4-5 interior 20170108.jpg|The interior of car KuMoHa E721-1005 of set P4-5 in January 2017

File:JR East E721-1000 series LED information board 20170108.jpg|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.

class="wikitable"

Designation

| Mc || Tc'

Numbering

| SAT721-10x || SAT720-10x

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

File:SAT721Train interior.jpg|The interior of car SAT721-101 in April 2017

File:SAT721Train carrycasespace.jpg|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.

AB-1 \| AB901-1 \|\| AB900-1
class="wikitable" ! Set \| colspan="2" style="text-align: center;" \| Numbering
AB-2 \| AB901-2 \|\| AB900-2
AB-3{{Cite web\|date=25 January 2022\|title=阿武隈急行AB900系AB-3編成が甲種輸送される\|url=https://railf.jp/news/2022/01/26/201500.html\|access-date=26 January 2022\|website=railf.jp}} \|AB901-3 \|AB900-3
AB-4{{Cite web \|date=16 March 2023 \|title=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 \|trans-title=Abukuma Express AB900 Series 4 and 5 Cars Commence Operation on March 18 - Unlimited Ticket Release \|url=https://news.mynavi.jp/article/20230316-2627128/ \|access-date=18 March 2023 \|website=MyNavi Corporation \|language=ja}} \|AB901-4 \|AB900-4
AB-5 \|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 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.

File:Shinchi Sta 20110404.jpg|The remains of sets P-1 and P-19 at Shinchi Station after the tsunami in 2011

File:E721-1000 intermediate cars Jimmuji 20160923.jpg

The first of a fleet of 19 new four-car E721-1000 sets (76 vehicles in total) was introduced on 30 November 2016{{cite web |url= http://railf.jp/news/2016/12/09/100000.html |script-title=ja: E721系1000番台が営業運転を開始 |trans-title=E721-1000 series enters revenue service|date= 9 December 2016|work= Japan Railfan Magazine Online|publisher= Koyusha Co., Ltd.|location= Japan|language= ja|archive-url= https://web.archive.org/web/20170104075306/http://railf.jp/news/2016/12/09/100000.html |archive-date= 4 January 2017|url-status=live |access-date= 4 January 2017}} on Tohoku Main Line, Joban Line, and Senzan Line services, replacing older 719 series units.{{cite web|url= http://jr-sendai.com/upload-images/2016/05/e721-1000.pdf|script-title= ja: E721系1000 代新造車両の投入について|trans-title= Details of introduction of new E721-1000 series trains|date= 26 May 2016|work= News release|publisher= East Japan Railway Company Sendai Division|location= Japan|language= ja|access-date= 27 May 2016|archive-date= 18 July 2020|archive-url= https://web.archive.org/web/20200718093146/https://jr-sendai.com/upload-images/2016/05/e721-1000.pdf|url-status= dead}} 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.{{cite web |url= http://railf.jp/news/2016/09/23/120000.html|script-title=ja: E721系1000番台中間車が甲種輸送される |trans-title=E721-1000 series intermediate cars transported|date= 23 September 2016|work= Japan Railfan Magazine Online|publisher= Koyusha Co., Ltd.|location= Japan|language= ja|archive-url= https://web.archive.org/web/20160923130709/http://railf.jp/news/2016/09/23/120000.html|archive-date= 23 September 2016|url-status=live |access-date= 23 September 2016}}

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,{{cite web |url=https://www.excite.co.jp/news/article/Trafficnews_83733/ |title=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 |trans-title=Abukuma Express' new vehicle, the AB900 series train, is completed. Towed by JR Freight “Kintaro” to Fukushima |language=ja |date=21 February 2019 |website=excite.co.jp |publisher=Excite Japan Co., Ltd. |archive-url=https://web.archive.org/web/20190811105138/https://www.excite.co.jp/news/article/Trafficnews_83733/ |archive-date=11 August 2019 |url-status=live |access-date=11 August 2019}} and are the first new trains for Abukuma Express since 1988.{{cite web |url=https://www.minyu-net.com/news/news/FM20190702-392512.php |title=『新型車両』始動！ＡＢ９００系阿武隈急行、開業以来初導入 |trans-title="New vehicle" started! AB900 series Abukuma Express, first introduced since its opening |language=ja |date=2 July 2019 |website=minyu-net.com |publisher=The Fukushima Minyu Shimbun |archive-url=https://web.archive.org/web/20190811095545/https://www.minyu-net.com/news/news/FM20190702-392512.php |archive-date=11 August 2019 |url-status=live |access-date=11 August 2019}} 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=

class="wikitable"

Set No.

! Manufacturer

! Date delivered

! Date withdrawn

P-1

| rowspan="4" | Kawasaki Heavy Industries

| 28 November 2006{{cite book |script-title=ja: JR電車編成表 2010夏 |trans-title=JR EMU Formations – Summer 2010|publisher = Kotsu Shimbunsha |date = May 2010 |location = Japan |language = ja |page = 25|isbn = 978-4-330-14310-1}}

| 12 March 2011Destroyed by tsunami on 11 March 2011.

P-2

| rowspan="3" | 17 January 2007

P-3

P-4

P-5

| rowspan="2" | Tokyu Car

| rowspan="2" | 18 December 2006

P-6

P-7

| rowspan="5" | Kawasaki Heavy Industries

| 15 January 2007

P-8

| rowspan="2" | 6 February 2007

P-9

P-10

| rowspan="2" | 23 February 2007

P-11

P-12

| rowspan="2" | Tokyu Car

| rowspan="2" | 15 January 2007

P-13

P-14

| rowspan="20" | Kawasaki Heavy Industries

| rowspan="2" | 28 February 2007

P-15

P-16

| rowspan="2" | 8 March 2007

P-17

P-18

| 23 March 2007

P-19

| 23 March 2007

| 12 March 2011

P-20

| rowspan="2" | 23 March 2007

P-21

P-22

| rowspan="2" | 17 April 2007

P-23

P-24

| rowspan="4" | 27 April 2007

P-25

P-26

P-27

P-28

| rowspan="4" | 31 May 2007

P-29

P-30

P-31

P-32

| rowspan="2" | 6 July 2007

P-33

P-34

| rowspan="4" | Tokyu Car

| rowspan="2" | 30 August 2007

P-35

P-36

| rowspan="2" | 26 September 2007

P-37

P-38

| rowspan="7" | Kawasaki Heavy Industries

| rowspan="2" | 2 November 2007

P-39

P-40

| rowspan="5" | 13 September 2010

P-41

P-42

P-43

P-44

= E721-500 series =

The delivery of E721-500 series cars are as follows:{{Citation needed|date=March 2023}}

class="wikitable"

Set No.

! Manufacturer

! Date delivered

P-501

| rowspan="3" | Kawasaki Heavy Industries

| 17 February 2006

P-502

| rowspan="2" | 30 September 2006

P-503

P-504

| Tokyu Car

| 25 October 2006

=E721-1000 series=

All manufactured by J-TREC.

class="wikitable"

Set No.

! Date delivered

P4-1

| 21 October 2016{{cite magazine|script-title=ja: JR車両のうごき|trans-title=JR rolling stock changes |magazine = Tetsudo Daiya Joho Magazine |volume = 46|issue = 395 |page = 127 |publisher = Kotsu Shimbun |location = Japan |language= ja |date = March 2017}}

P4-2

| 26 October 2016

P4-3

| 11 November 2016

P4-4

| 16 November 2016

P4-5

| 28 November 2016

P4-6

| 1 December 2016

P4-7

| 6 December 2016

P4-8

| 14 December 2016

P4-9

| 27 December 2016

P4-10

| 26 December 2016

P4-11

P4-12

P4-13

P4-14

P4-15

P4-16

P4-17

P4-18

P4-19

=SAT721 series=

File:SAT721 SA103 Omiya 20061114.JPGAll sets are manufactured by Kawasaki and delivered as of 20 November 2006.{{Citation needed|date=March 2023}}

Set No.
class="wikitable"
SA101
SA102
SA103

=AB900 series=

All sets are manufactured by J-TREC.

class="wikitable"

Set No.

! Date delivered

AB-1

| 21 February 2019{{cite web |url=https://railf.jp/news/2019/02/21/230000.html |title=阿武隈急行AB900系が登場 |trans-title=Abukuma Express AB900 series appeared |date=21 February 2019 |work=Japan Railfan Magazine Online |publisher=Koyusha Co., Ltd. |location=Japan |language=ja |archive-url=https://web.archive.org/web/20190811093358/https://railf.jp/news/2019/02/21/230000.html |archive-date=11 August 2019 |url-status=live |access-date=11 August 2019}}

AB-2

| February 2020{{cite web |url=http://rail.hobidas.com/rmn/archives/2020/02/jrab9002.html |title=【JR貨】【阿武隈急行】AB900系第2編成を甲種輸送 |trans-title=(JR freight) (Abukuma Express) Transport of the second AB900 series set |date=20 February 2020 |website=rail.hobidas.com |publisher=Neko Publishing |language=ja |access-date=21 February 2020 |archive-url=https://archive.today/20200221101647/http://rail.hobidas.com/rmn/archives/2020/02/jrab9002.html |archive-date=21 February 2020 |url-status=live}}

AB-3

|25 January 2022{{Cite web |title=阿武隈急行AB900系AB-3編成が甲種輸送される |trans-title=Delivery of Abukuma Express AB900 series set AB-3 |url=https://railf.jp/news/2022/01/26/201500.html |access-date=18 March 2023 |website=Japan Railfan Magazine Online |language=ja}}

AB-4

AB-5