{{short description|Japanese train type}} {{Use dmy dates|date=June 2023}} {{Infobox train | name = E721 / SAT721 / AB900 series | image = E721&SAT721.JPG | caption = E721-0 series (right) and the SAT721 series variant (left), August 2007 | service = | manufacturer = [[Kawasaki Heavy Industries]], [[Tokyu Car Corporation]], [[J-TREC]] | factory = | family = | replaced = [[417 series|417]], [[455 series|455]], [[717 series|717]] and [[719 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, [[2011 Tōhoku earthquake and tsunami|tsunami damage]]) | formation = 2 or 4 cars per set | fleetnumbers = P1–P44, P501–P504, P4-1–P4-19, SA101–SA103 | capacity = | operator = {{Plainlist| * [[JR East]] * [[Sendai Airport Transit]] (SAT721) * [[Abukuma Express]] (AB900) }} | depots = Sendai | lines = {{Plainlist| * [[Tōhoku Main Line]] * [[Jōban Line]] * [[Senzan Line]] * [[Sendai Airport Line]] * [[Abukuma Express Line]] }} | 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 = {{cvt|125|kW}} per motor | transmission = | aux = | powersupply = | hvac = | electricsystem = {{20 kV 50 Hz|conductor=overhead}} | collectionmethod = [[Pantograph (transport)|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|lead=yes}} 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
<gallery> 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:仙台空港鉄道 Sendai Airport SAT-721 長町駅 (20251225) - cropped.jpg|SAT721 series set SA101 in December 2025 File:Abukuma-kyuko-AB900-AB1-20190221-133537.jpg|AB900 series set AB-1 on delivery at Zushi Station in February 2019 </gallery>
==Operations== {{Plainlist| * {{Colorbull|Sienna}} [[Banetsu West Line]] (since March 2017)<ref name="railfan20170309">{{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}}</ref> * {{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.<ref name="jrr2016_winter">{{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}}</ref>
===E721-0 series===
{| class="wikitable" |- ! Designation | Mc || Tc' |- ! Numbering | KuMoHa E721-xx || KuHa E720-xx |}
The KuMoHa cars have one PS109 single-arm [[Pantograph (rail)|pantograph]]. The KuHa cars have a toilet.<ref name="jrr2016_winter"/>
===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.<ref name="jrr2016_winter"/>
===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.<ref name="railfan670">{{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= }}</ref> The KuHa E720 is located at the southern end.<ref name="railfan670"/>
{| 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 || 62/152 || 62/152 || 56/138 |}
The two motored cars (KuMoHa and MoHa) each have one PS109 single-arm pantograph.<ref name="railfan670"/> The KuHa cars have a toilet.<ref name="railfan670"/>
<gallery> 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 </gallery>
===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.<ref name="jrr2016_winter"/>
<gallery> 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 </gallery>
===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.
{| class="wikitable" ! Set | colspan="2" style="text-align: center;" | Numbering |- ! AB-1<ref name="railfan21022019"/> | AB901-1 || AB900-1 |- ! AB-2<ref name="neko20022020"/> | AB901-2 || AB900-2 |- !AB-3<ref>{{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}}</ref> |AB901-3 |AB900-3 |- !AB-4<ref name=":0">{{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}}</ref> |AB901-4 |AB900-4 |- !AB-5<ref name=":0" /> |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.<ref name="jrr2016_winter"/> The first E721-500 and SAT721 series sets were delivered from February 2006 and entered service on Sendai Airport services on 18 March 2007.<ref name="jrr2016_winter"/>
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 [[Total loss|written off]] and scrapped.<ref name="jrr2016_winter"/>
<gallery> File:Shinchi Sta 20110404.jpg|The remains of sets P-1 and P-19 at [[Shinchi Station]] after the tsunami in 2011 </gallery>
[[File:E721-1000 intermediate cars Jimmuji 20160923.jpg|thumb|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<ref name="railfan20161209">{{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}}</ref> on [[Tohoku Main Line]], [[Joban Line]], and [[Senzan Line]] services, replacing older [[719 series]] units.<ref name="jreast20160526">{{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}}</ref> The new trains are built by [[J-TREC]], with construction shared between the company's Yokohama and Niitsu factories.<ref name="jreast20160526"/> These trains feature LED interior lighting.<ref name="jreast20160526"/>
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.<ref name="railfan20160923">{{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}}</ref>
In order to replace their 8100 series trains, [[Abukuma Express]] announced the order of new AB900 series trains in summer 2018.<ref name="railfan21022019"/> They are based on the E721 series,<ref name="excite21022019">{{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}}</ref> and are the first new trains for Abukuma Express since 1988.<ref name="minyu02072019">{{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}}</ref> The first AB900 series set was delivered in February 2019.<ref name="railfan21022019"/> It entered service on 1 July 2019.<ref name="minyu02072019"/>
==Fleet/build details== The manufacturers and delivery dates for the fleet are as shown below.<ref name="jrr2016_winter"/>
===E721-0 series=== {| class="wikitable" |- ! Set No. ! Manufacturer ! Date delivered ! Date withdrawn |- | P-1 | rowspan="4" | [[Kawasaki Heavy Industries]] | 28 November 2006<ref name="jrr2010">{{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}}</ref> | 12 March 2011<ref group="Note" name="tsunami">Destroyed by tsunami on 11 March 2011.</ref> |- | 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<ref name="jrr2010"/> | 12 March 2011<ref group="Note" name="tsunami"/> |- | 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 | |}
{{Reflist|group="Note"}}
=== 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<ref name="dj395">{{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}}</ref> |- | P4-2 | 26 October 2016<ref name="dj395" /> |- | P4-3 | 11 November 2016<ref name="dj395" /> |- | P4-4 | 16 November 2016<ref name="dj395" /> |- | P4-5 | 28 November 2016<ref name="dj395" /> |- | P4-6 | 1 December 2016<ref name="dj395" /> |- | P4-7 | 6 December 2016<ref name="dj395" /> |- | P4-8 | 14 December 2016<ref name="dj395" /> |- | P4-9 | 27 December 2016<ref name="dj395" /> |- | P4-10 | 26 December 2016<ref name="dj395" /> |- | 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.JPG|thumb|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|date=March 2023}} {| class="wikitable" |- ! Set No. |- | SA101 |- | SA102 |- | SA103 |}
===AB900 series=== All sets are manufactured by J-TREC. {| class="wikitable" |- ! Set No. ! Date delivered |- | AB-1 | 21 February 2019<ref name="railfan21022019">{{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}}</ref> |- | AB-2 | February 2020<ref name="neko20022020">{{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}}</ref> |- |AB-3 |25 January 2022<ref>{{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}}</ref> |- |AB-4 | |- |AB-5 | |}
==See also== * [[Aoimori 703 series]], a derivative for use on the [[Aoimori Railway]] * [[Railway electrification in Japan]]
==References== {{reflist}}
==External links== {{Commons category multi|JR East E721|SAT721|Abukuma Kyuko AB900 series}} * [http://www.jreast.co.jp/train/local/e721.html JR East E721 series] {{in lang|ja}}
{{JR East EMU}}
[[Category:Electric multiple units of Japan]] [[Category:J-TREC multiple units]] [[Category:East Japan Railway Company]] [[Category:20 kV AC multiple units]] [[Category:Train-related introductions in 2006]] [[Category:Tokyu Car multiple units]] [[Category:Kawasaki multiple units]]