{{short description|Japanese electric multiple unit train type}} {{Use dmy dates|date=January 2018}} {{Infobox train | name = 821 series | image = Series821-U002.jpg | imagesize = 300px | caption = Set U002 in June 2019 | service = March 2019 &ndash; Present | manufacturer = [[Hitachi]] | factory = [[Kudamatsu, Yamaguchi]] | family = <!-- [[Hitachi A-train]] --> | replaced = | yearconstruction = 2018–2022 | yearservice = 16 March 2019 | refurbishment = | yearscrapped = | numberconstruction = | numberbuilt = 21 vehicles (7 sets) | numberservice = | numberpreserved = | numberscrapped = | formation = 3 cars per trainset | fleetnumbers = U001- | capacity = | operator = {{ric|JR Kyushu|name=y}} | depots = | lines = [[Kagoshima Main Line]] | carbody = <!-- Aluminium --> | carlength = <!-- {{Convert|20,000|mm|ftin|abbr=on}} --> | width = <!-- {{Convert|2,994|mm|ftin|abbr=on}} --> | height = <!-- {{Convert|4,096|mm|ftin|abbr=on}} --> | floorheight = <!-- {{Convert|1,115|mm|ftin|abbr=on}} --> | doors = 3 pairs per side | maxspeed = {{Convert|120|km/h|mph|round=5|abbr=on}} (design speed) | weight = | acceleration = | deceleration = | traction = [[variable frequency drive|Variable frequency]] ([[Silicon carbide|SiC]]-[[MOSFET]]) | poweroutput = | transmission = | aux = | powersupply = | hvac = | electricsystem = {{20 kV 60 Hz}} ([[overhead catenary]]) | collectionmethod = [[Pantograph (transport)|Pantograph]] | bogies = | brakes = | safety = | coupling = | multipleworking = [[811 series]]<ref name="railfan 2019-03-17"/> | gauge = {{RailGauge|1067mm|lk=on}} }}

The {{Nihongo|'''821 series'''|821系}} is an AC [[electric multiple unit]] (EMU) train type operated by [[Kyushu Railway Company]] (JR Kyushu) in Japan since March 2019. Two three-car trains were delivered in February 2018 for testing in preparation for full production and entry into revenue service.<ref name="tetsudoshimbun20180126">{{cite web |url= http://tetsudo-shimbun.com/headline/entry-1291.html|script-title=ja: JR九州、次世代近郊型交流電車「821系」導入へ |trans-title= JR Kyushu to introduce new-generation 821 series AC suburban trains |date= 26 January 2018|work= tetsudo-shimbun.com |publisher= Tetsudo Shimbunsha |location= Japan|language= ja|archive-url= https://web.archive.org/web/20180126085607/http://tetsudo-shimbun.com/headline/entry-1291.html |archive-date= 26 January 2018|url-status=live |access-date= 26 January 2018}}</ref> There are currently 7 three-car trains in service.

==Formation== The 821 series trains are formed as three-car sets as follows.<ref name="railfan20180221"/><ref name="railfan695">{{cite magazine |last=Arie |first=Kenta |last2=Yasumori |first2=Keitaro |date=March 2019 |title= |script-title=ja: JR九州 821系近郊形交流電車 |trans-title=JR Kyushu 821 series AC suburban train |magazine=[[Japan Railfan Magazine]] |publisher=Koyusha Co., Ltd. |location=Japan |pages=54–58 |language=Japanese |volume=59 |issue=695}}</ref> {| class="wikitable" |- ! Designation | Mc || T || Tc |- ! Numbering | KuMoHa 821 || SaHa 822 || KuHa 821 |}

* The KuMoHa 821 car is equipped with one single-arm [[Pantograph (transport)|pantograph]].<ref name="railfan695" />

<gallery> File:821 series KuMoHa 821-2 Kudamatsu Station 20180220.jpg|The pantograph end of driving car KuMoHa 821-2 </gallery>

==History== [[File:821 series U001 delivery Kudamatsu Station 20180220 (2).jpg|thumb|Sets U001 and U002 on delivery in February 2018]] Details of the trains on order were officially announced by JR Kyushu in January 2018.<ref name="tetsudoshimbun20180126"/> Two three-car trains were delivered in February 2018 from the [[Hitachi]] factory in [[Kudamatsu, Yamaguchi]].<ref name="railfan20180221">{{cite web |url= https://railf.jp/news/2018/02/21/173000.html |script-title=ja: 821系が甲種輸送される |trans-title= 821 series delivered |date= 21 February 2018|work= Japan Railfan Magazine Online|publisher= Koyusha Co., Ltd.|location= Japan|language= ja|archive-url= https://web.archive.org/web/20180221093406/https://railf.jp/news/2018/02/21/173000.html |archive-date= 21 February 2018|url-status=live |access-date= 21 February 2018}}</ref>

The trains first entered revenue service on 16 March 2019 on the [[Kagoshima Main Line]].<ref name="railfan 2019-03-17">{{Cite web |date=2019-03-17 |title= |script-title=ja:821系が営業運転を開始 |trans-title=821 series begins commercial operation |url=https://railf.jp/news/2019/03/17/205800.html |access-date=2023-01-18 |website=Japan Railfan Magazine Online |publisher=Koyusha Co., Ltd. |language=ja |publication-place=Japan |archive-date=21 November 2021 |archive-url=https://web.archive.org/web/20211121172933/https://railf.jp/news/2019/03/17/205800.html |url-status=live }}</ref>

==References== {{reflist}}

==External links== {{Commons category}} * [http://www.jrkyushu.co.jp/news/__icsFiles/afieldfile/2018/01/26/180126_001821_1.pdf JR Kyushu press release issued on 26 January 2018] {{in lang|ja}}

{{JR Kyushu rolling stock}}

[[Category:Electric multiple units of Japan]] [[Category:Kyushu Railway Company]] [[Category:Train-related introductions in 2018]] [[Category:Hitachi multiple units]] [[Category:20 kV AC multiple units]]