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The China Railways HXD1 (also known as the DJ4) is an eight axle high power heavy freight twin unit locomotive of axle configuration Bo'Bo'+Bo'Bo'. Both the HXD1 and HXD2 double unit locomotives were designated DJ4, the HXD2 units being disambiguated DJ4-6000. 〔(HXD2 electric locomotive ) ''news.chineserailways.com''〕 The 7.34 billion Yuan order for 180 locomotives was given in 2004, with the first locomotive manufactured by November 2006.〔(全球最大功率交流传动电力机车在湖南株洲下线 ) The world's largest power AC electric locomotives off the assembly line in Zhuzhou, Hunan, 9 November 2006, ''news.xinhuanet.com''〕〔(Locomotives Reference List ) Electric Double Locomotive HXD1 for Chinese Railways CR ''www.transportation.siemens.com''〕 Production of the 180 locomotives in the class took place between 2006 and 2008.〔〔(【引用サイトリンク】title= Introduction: CSR Zhuzhou Electric Locomotive Co., Ltd. )〕 A second batch of 40 was delivered between 2009 and 2010. In 2012 CSR began testing of a revised version of the locomotive, built by using higher levels of domestically sourced equipment. 50 units were delivered (1001 - 1050). Another unit (6001) was built at the end of 2012 by CSR Ziyang using Zhuzhou plans. In 2013, CSR delivered 3 2xBo'Bo' to Shenhua Mining Group (14,4 MW), directly issued from "normal" HXD1, but with a modernized frontcab.〔神华新型八轴大功率交流电力机车上线试运行. 国务院国资委. 2013-01-17 ().〕 The same operator ordered 8 2xBo'Bo' in the first quarter 2013.〔朔黄铁路公司新购电力机车全部上线运行. 新华网河北频道. 2013-02-19 ()〕 ==Background and design== The HXD1 locomotives are based on the Siemens' EuroSprinter derived design of the China Railways DJ1 locomotive.〔 Construction of the locomotives was carried out by Zhuzhou Electric Locomotive Company Limited. The locomotive consists of two identical single cab Bo'Bo' units coupled together, the main locomotive body is load bearing, electric traction equipment uses an AC/DC-AC transmission chain, with the traction motors being three phase asynchronous devices. The electrical inverter for traction motor power control is an IGBT type. The traction control system is a Siemens SIBA32, units can also be operated in multiple using the Locotrol distributed traction control system. The locomotive has a pneumatic disc brake, as well as being able to brake regeneratively. Standard operating speed is 〔 or when ballasted to 25 t axleload.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「China Railways HXD1」の詳細全文を読む スポンサード リンク
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