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EMD SD40-2
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== Rebuilds == A number of SD40-2s have been rebuilt into other models. Some of the most unusual are the [[metre gauge]] '''BB40-2'''s for use in Brazil. {{citation needed|date=January 2022}} Conversely, several other models of EMD locomotive have sometimes been rebuilt to SD40-2 standards, including the [[EMD SD40|SD40]], [[EMD SD45|SD45]] and [[EMD SD45-2|SD45-2]]. Normally, this consists of electrical upgrades (-2) and replacing the 20-cylinder prime mover with a 16-cylinder version, often built for [[GE Capital]] in Poland using EMD's manufacturing drawings and specifications. An outgrowth of this may be [[GE Transportation]]'s second-sourcing of EMD repair parts. {{citation needed|date=January 2022}} The unusually troublesome [[EMD SD50|SD50]] have also been rebuilt into the equivalent of SD40-2s, rather than scrapping them. The 645F block and crankshaft are inherently good designs (indeed, the lessons learned with the 645F became part of the [[EMD 710|710G]]); lowering the rating from {{convert|3500|hp|kW}} at 950 rpm to {{convert|3000|hp|kW}} at 900 rpm solved the mechanical and electrical reliability issues. {{citation needed|date=January 2022}} === SD40N === Union Pacific has rebuilt 486 of their SD40-2's into SD40N's at their Jenk's shop. These units received a microprocessor control system to increase adhesion, control options, and extend the life of the locomotive.<ref>{{Cite web |last=Craig |first=R |title=Union Pacific Motive Power |url=https://www.thedieselshop.us/UP.HTML |url-status=live |archive-url=https://web.archive.org/web/20231228223440/https://www.thedieselshop.us/UP.HTML |archive-date=28 December 2023 |access-date=2024-03-15 |website=The Diesel Shop}}</ref><ref>{{Cite web |title=Union Pacific Locomotive Roster |url=https://www.up.com/aboutup/funstuff/locomotive-roster/index.htm |url-status=live |archive-url=https://web.archive.org/web/20240104211824/https://www.up.com/aboutup/funstuff/locomotive-roster/index.htm |archive-date=4 January 2024 |access-date=15 March 2024 |website=Up.com}}</ref> ===SD40-3=== The Dash 3 suffix is not part of any official lineup, and is a loose designation for rebuilt Dash 2 series EMDs among several different railroads. One example of an SD40-3 rebuild program is the one conducted by [[CSX]] at its Huntington, WV Shops. It started in 2010 with 10 units upgraded and numbered 4000-4009; in 2011, 20 units went through the program and were numbered 4010-4029 and in 2012 another 20 units followed and were numbered 4030-4049. One of the most notable rebuilds was SD40-2 [[CSX 8888 incident|8888]], (now rebuilt to 4389), which in 2001 was involved in a runaway incident caused by the failure of the engineer to notice the train gradually accelerating during yard switching.<ref>{{cite news|last1=Ross|first1=Jim|title=New power from old: CSX locomotive rebuild program preserves jobs in Huntington, WV|url=http://www.statejournal.com/story/29895467/new-power-from-oldcsx-locomotive-rebuild-programpreserves-jobs-in-huntington-wv|access-date=2015-04-10|work=[[The State Journal (West Virginia)|The State Journal]]|date=2015-09-26|archive-url=https://web.archive.org/web/20150830010232/http://www.statejournal.com/story/29895467/new-power-from-oldcsx-locomotive-rebuild-programpreserves-jobs-in-huntington-wv|archive-date=2015-08-30|url-status=dead}}</ref> These locomotives feature new cabs, air conditioning systems, and other new technologies. Norfolk Southern also has an ongoing SD40-3 rebuild program as of 2023. <ref>{{cite web|title=The last grimy few: Norfolk Southern high hoods|date=18 July 2023 |url=https://www.trains.com/trn/railroads/locomotives/the-last-grimy-few-norfolk-southern-high-hoods/|access-date=4 April 2024}}</ref> === SD22ECO === The [[EMD SD22ECO|SD22ECO]] is an EMD SD40-2 or similar, repowered with an EMD 8-710-ECO engine. The resulting locomotive is rated at {{convert|2150|hp|kW}}, and meets EPA Tier II emissions regulations.<ref>{{Cite web |title=New 710ECO Repower Products Provide High Performance for Low and Medium Horsepower Applications |url=http://www.emdiesels.com/emdweb/company/more/062209_kcsrepower.html |url-status=dead |archive-url=https://web.archive.org/web/20090718044710/http://www.emdiesels.com/emdweb/products/pdf/EMD_710ECO_Repower_Solutions.pdf |archive-date=18 July 2009 |access-date=27 August 2009 |website=www.emdisels.com}}</ref> === SD30C-ECO === The [[EMD SD30C-ECO|SD30C-ECO]] is an EMD SD40-2 re-powered with an EMD 12-710 prime mover. The locomotive is rated at {{convert|3000|hp}} and meets EPA Tier 0 emissions regulations.<ref>{{cite news | url=http://trn.trains.com/news/news-wire/2015/02/canadian-pacific-orders-additions-sd30c-ecos | title=Canadian Pacific orders additional SD30C-ECOs | work=[[Trains (magazine)|Trains]] | date=10 February 2015 | access-date=16 February 2015}} {{subscription required}}</ref> A similar rebuild, the [[EMD SD40E3|SD40E3]] was carried out by CSX in early 2017. <ref>{{cite web |last=Gunnoe |first=Chase |date=February 1, 2017 |title=CSX takes delivery of first SD40E3 'Eco' units NEWSWIRE |url=https://www.trains.com/trn/news-reviews/news-wire/01-csx-takes-delivery-of-sd40e3-eco-units/ |url-status=live |archive-url=https://web.archive.org/web/20210609043043/https://www.trains.com/trn/news-reviews/news-wire/01-csx-takes-delivery-of-sd40e3-eco-units/ |archive-date=June 9, 2021 |website=[[Trains (magazine)|Trains]]}}</ref> === ET23DCM === [[File:ET23DCM-SD23T4-locomotive.jpg|thumb|A [[CSX Transportation|CSX]] ET23DCM (SD23T4) locomotive in Worcester, Massachusetts]] The [[GE Evolution Series|ET23DCM]] is an EMD SD40-2 rebuilt by [[Wabtec]], and repowered with a [[GE Evolution Series]] Inline 6 cylinder prime mover. This locomotive meets the EPA Tier 4 emission standards. CSX has ordered 15 locomotives, and Wabtec constructed one demonstrator locomotive.<ref>{{cite news |last=Guss |first=Chris |date=1 November 2022 |title=ET23DCM locomotives explained |url=https://www.trains.com/trn/railroads/locomotives/et23dcm-locomotives-explained/ |url-status=live |archive-url=https://web.archive.org/web/20230930132825/https://www.trains.com/trn/railroads/locomotives/et23dcm-locomotives-explained/ |archive-date=30 September 2023 |access-date=12 January 2023 |work=[[Trains (magazine)|Trains]]}} </ref>
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