Editing GE Evolution Series (section)

== Models ==
Currently, six different Evolution Series models (seven including rebuilds), have been produced for the North American market. They are all six-axle locomotives and have [[AAR wheel arrangement#C-C|AAR wheel arrangement C-C]] ([[UIC classification]] Co′Co′), except for the ES44C4 and ET44C4 which uses the [[AAR wheel arrangement#A1A-A1A|AAR A1A-A1A wheel arrangement]] and the [[Metre-gauge railway|meter-gauge]] version developed for the Brazilian network ES43BBi which is [[AAR wheel arrangement#B-B-B-B|AAR B-B-B-B]].

=== ES40DC (2004–2008) ===
[[File:Intermodal (5831026098).jpg|thumb|NS ES40DC No. 7698]]

The '''ES40DC''' (Evolution Series, 4,000&nbsp;hp, DC traction) replaced the [[GE Dash 9-40CW|Dash 9-40CW]] model in the General Electric catalogue and, like the former model, was delivered exclusively to [[Norfolk Southern Railway]]. ES44DCs owned by [[CSX Transportation]] were also given this designation in 2009 after being de-rated to {{convert|4,000|hp|kW|abbr=on}}. However, high-horsepower demand on Norfolk Southern made a mandatory repowering of several ES40DC engines into their former ES44DC power.<ref>{{Harvnb|Solomon|2011|p=64}}</ref>

=== ES44DC (2005–2010) ===
The '''ES44DC''' (Evolution Series, 4,400&nbsp;hp, DC traction) replaced the [[GE Dash 9-44CW|Dash 9-44CW]] model in the General Electric catalogue. Primary users are [[BNSF Railway]], [[CSX Transportation]], and [[Canadian National Railway]]. [[Pilbara Iron]] in [[Australia]] ordered a lengthened, international version designated ES44DCi. The extra length is used for a larger radiator to increase cooling capacity in the Australian [[outback]].

=== ES44AC (2003–present) ===
[[File:CN 2869 EF-644p parked along the Riverwalk Trail in Quesnel, BC (DSCF5166).jpg|thumb|[[Canadian National Railway|CN]] ES44AC No. 2869]]

The '''ES44AC''' (Evolution Series, 4,400&nbsp;hp, AC traction) replaced the [[GE AC4400CW|AC4400CW]] model in the General Electric catalogue. These locomotives have been ordered by every Class I railroad in North America: [[Union Pacific Railroad]] (who refers to these locomotives as the ''C45ACCTE''), [[BNSF Railway]], [[CSX Transportation]], [[Norfolk Southern Railway]], [[Ferromex]], [[CPKC Railway]], and [[Canadian National Railway]]. 

Union Pacific also bought the heavy ballasted variation of this model, the ES44AH, and refers to it as the C45AH. UP also uses this designation to refer to their ET44AH units.

CSX Transportation has bought these locomotives and they were always heavy ballasted, so they called these the '''ES44AH'''. The first set was 700-999, which was built from 2007-2011. Beginning 2023, CSX has repainted and renumbered the 3000 series locomotives to heritage units. The first heritage, 1827, was painted into Baltimore & Ohio and renumbered from 3059 on May 11, 2023.

BNSF Railway purchased 25 ES44AC locomotives in 2023, and they are all classified as '''ES44ACH.''' They were built between August and September of 2023 and were built concurrently with the '''ET44ACH'''. The numbers were 3282-3306, which officially ended the production of the '''ES44C4''' in 2020. These units are Tier 4 credit units. In 2024, BNSF has bought 25 more ES44ACH locomotives, which are numbered from 3307-3331. These locomotives weigh 436,320 lbs.

=== ES44C4 (2009–2020) ===
[[File:BNSF 8013.jpg|thumb|[[BNSF Railway|BNSF]] ES44C4 No. 8013]]The '''ES44C4''' (Evolution Series, 4,400&nbsp;hp, C to denote 3 axles per truck, 4 traction motors) was introduced in 2009. While similar to the ES44AC, the ES44C4 has two traction motors per truck, instead of the conventional three such as on the ES44AC. No ES44C4s with DC traction were built.  The center axle of each truck is unpowered, giving an A1A-A1A wheel arrangement. BNSF Railway is the launch customer for this model, ordering an initial batch of 25 units numbered 6600–6624.<ref>{{cite news|url=http://www.railwaygazette.com/news/single-view/view/ge-unveils-es44c4-locomotive.html|title=GE unveils ES44C4 locomotive|publisher=[[Railway Gazette International]]|date=27 May 2009|access-date=25 January 2012|archive-date=12 October 2012|archive-url=https://web.archive.org/web/20121012100714/http://www.railwaygazette.com/news/single-view/view/ge-unveils-es44c4-locomotive.html|url-status=live}}</ref> The ES44C4 was initially only built for BNSF. The 4200s and units 7921-7999 are certified as Tier 4 Credit units, while the others are Tier 2 or Tier 3. On 30 January 2014 [[Florida East Coast Railway]] announced that they would buy 24 ES44C4s, to be numbered 800–823, for heavy haul service and intermodal traffic. All were delivered by the end of 2014, in order to beat the EPA's deadline on exhaust-emissions standards for new-built Tier 3 locomotives.

A feature of these units is a variable traction control system in their computer systems. One of the differences between an ES44AC and an ES44C4 is the air cylinders and linkages on the truck sideframes of the ES44C4; these are part of the traction control system. Every time a variation in grade, traction, or wheel slip occurs, the computer adjusts the pressure in these cylinders to maintain sufficient adhesion, by varying the weight on the drive axles.<ref>{{cite web|url=http://www.railwayage.com/content/view/855/121/|title=GE Transportation unveils new Evolution Series locomotive|access-date=3 November 2009|archive-date=27 September 2011|archive-url=https://web.archive.org/web/20110927134033/http://www.railwayage.com/content/view/855/121/|url-status=dead}}</ref><ref>{{cite web |url=http://www.gevirtualrailexpo.com/ge_virtual_rail_expo/media/files/model-es44c4.pdf?ext=.pdf |title=Archived copy |website=www.gevirtualrailexpo.com |access-date=11 January 2022 |archive-url=https://web.archive.org/web/20141031161946/http://www.gevirtualrailexpo.com/ge_virtual_rail_expo/media/files/model-es44c4.pdf?ext=.pdf |archive-date=31 October 2014 |url-status=dead}}</ref>

===ES44DCi/ES44ACi===
[[File:Wabtec ES44Aci Suzano.jpg|thumb|Wabtec ES44ACi No. 2542]]
The '''ES44DCi''' (Evolution Series, 4400 horsepower, DC traction, international version) was built for the [[Rio Tinto Group|Rio Tinto]] railway in Australia. The '''ES44ACi''' was built for the [[Roy Hill mine|Roy Hill]] and [[Rio Tinto Group]].

The ES44ACi/DCi is essentially an ES44AC/DC in a [[GE AC6000CW]]'s body, with the radiator at the end protruding out over the rear deck in the same way the AC6000CW does. The locomotive's large radiator allows it to handle the Australian outback's extreme temperatures.

Roy Hill has ordered 21 ES44ACi locomotives, and is currently in possession of all 21 locomotives (numbered 1001 "Ginny"-1021). Rio Tinto ordered 100 ES44DCi locomotives and has all 100 (numbered 8100–8199) and 21 ES44ACi locomotives (numbered 9100–9120) and more are on order. Rio Tinto's units can be remotely driven, meaning nobody has to be in the cab as they can be controlled from a control center.<ref>{{Cite web |title=Rio Tinto train completes first crewless trip {{!}} Trains Magazine |url=https://www.trains.com/trn/news-reviews/news-wire/05-rio-tinto-automated/ |access-date=2022-05-04 |website=Trains |date=July 2018 |language=en-US |archive-date=8 May 2022 |archive-url=https://web.archive.org/web/20220508202241/https://www.trains.com/trn/news-reviews/news-wire/05-rio-tinto-automated/ |url-status=live }}</ref>

Ferromex also acquired 50 ES44ACi. As the construction of these locomotives was subsequent to the new environmental laws of the US, GE cataloged them only as ES44ACi, although in the external technical specifications of the locomotives say ES44AC). These locomotives can no longer reenter the US operating.

In Brazil, the Rumo, Suzano and MRS Logística railways purchased 25 units, manufactured at Wabtec of Brazil with broad-gauge trucks.<ref>{{cite web | url=https://www.agenciainfra.com/blog/trilhos-brasileiros-comecam-a-receber-as-locomotivas-mais-sustentaveis-do-pais/ | title=Trilhos brasileiros começam a receber as locomotivas mais sustentáveis do país – Agência iNFRA | date=7 April 2022 }}</ref>

===ET44AC/ET44C4 (2012–present)===
[[File:Union_Pacific_loco.png|thumb|Union Pacific ET44AC (C45AH) No. 2668]]
The '''ET44AC''' (Evolution Series Tier 4, 4,400&nbsp;hp, AC traction) replaces the [[ES44AC]] model.  These locomotives have been ordered by every US and Canadian Class I railroad, including [[BNSF Railway]], [[Canadian National Railway]], [[Canadian Pacific Kansas City|CPKC]], [[CSX Transportation]], [[Norfolk Southern]], and [[Union Pacific]]. BNSF also ordered similar ET44C4 locomotives, which have a dynamic weight management system instead of a traction motor on the middle axle of each truck. UP and CSX designate their ET44ACs as '''ET44AH''' although UP calls these C45AH, and BNSF calling them '''ET44ACH''' as their locomotives are ballasted to 436,320lbs.

=== ET23DCM (2023–present) ===
[[File:ET23DCM-SD23T4-locomotive.jpg|thumb|CSX ET23DCM No. 1718]]

The ET23DCM (Evolution Series Tier 4, 2350 hp, DC traction), sometimes called the SD23T4, is a modernized locomotive using [[Electro-Motive Diesel|EMD]]'s [[EMD SD40-2|SD40-2]] platform and the Wabtec Inline 6-cylinder Tier 4 diesel engine.<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> [[CSX Transportation]] ordered 15 of these locomotives, with most being built at their Huntington Heavy Repair Shop. Wabtec also built one locomotive as a demonstrator from ex-NS SD40-2 3259.

===TE33A===
{{Main|TE33A}}
The TE33A is an export 1520&nbsp;mm gauge locomotive in the GE Evolution Series.

===3TE25K2M===
{{Main|2TE25K}}
The 3TE25K2M is an export 1520mm gauge locomotive in the GE Evolution Series for [[russian railways|Russian Railways]].