GE Evolution Series

The Evolution Series are 6Axle\CoCo DieselElectric locomotives, built 2003\Later by GeneralElectric\GE; as of 2019, over 5000 units have been produced. Initially designed to comply with USEPA.Tier2 regs, later models comply with stricter Tier3 & Tier4 regs.
The Evolution Series, was designed to replace GE's Dash 9 and AC4400CW models. The Tier 2 and Tier 3-compiiant runs are externally similar to their predecessors, with the only main difference being a larger radiator section in the rear third of the engine. The radiator includes a GEVO exhaust particle filtering unit fitted in front of the actual radiator vents. In addition, the radiator extends all the way to the rear end of the locomotive. 
Tier 4-compliant GEVO's feature much larger radiators with split cooling. Pre-production demonstrator GEVO's also feature a "hump" in the middle of the long hood, which houses a urea-injection exhaust aftertreatment system. No railroad has ordered the urea aftertreatment system, making the "hump" irrelevant on Tier 4 production models. The Tier 4 units have been unofficially named "ET" rather than "ES", the "T" stands for "Tier 4". This designation is currently only used by BNSF.
==Versions==
*ES44DC - C44-9W successor. See here: GE ES44DC.
*ES40DC - 4,000 horsepower version custom-built for Norfolk Southern and CSX, all have been re-rated to 4400 horsepower since.
*ES44AC - AC4400CW successor) See here: GE ES44AC.
*ES44AH - ES44AC ballasted to 420,000+ lbs for added tractive effort, custom-built for CSX Transportation and Union Pacific.
*ES44C4 - A1A-A1A trucked version (only 4 powered axles), so far only owned by BNSF Railway and Florida East Coast Railway. See here: GE ES44C4.
*ET44AC - Tier 4-compliant version of the ES44AC, to begin production in summer 2015.
*ET44C4 - Tier 4-compliant version of the ES44C4. First production unit is BNSF 3916, built in May 2015. 
*ES44DCi (see here: http://www.railpage.com.au/locos/class/260/)
*ES59ACi (6,000 hp export locomotive sold to China) 
*ES58ACi(broad-gauge 5800 hp Brazilian version of the ES44AC)
*ES60AC (CSX conversion of old AC6000CW to 16 cylinder gevo engine)
==Trivia==
*Earlier ES44AC and ES44DC units were often classified as an AC44EV or a C44EV before the term "GEVO" was used; besides the official series name being officially developed.
*AC45CCTE is the name often used by Union Pacific GEVO units, mainly because of the fact that they have slightly more tractive effort due to management software.
*BNSF Railway had their earlier ES44DC's painted in their Heritage 2 (H2) paint scheme, and eventually their Heritage 3 (H3) scheme which made them the first to have the Heritage 3 scheme.
*Union Pacific 7964 was the 5,000th GEVO ever produced, and wears special banners to commemorate the milestone.
*The ES58ACi oddly doesn't include a different style of trucks, but rather narrow DC "hi-aid" trucks.
*Norfolk Southern (NS) has a fleet of ES44AC GEVO units (including a fleet of SD70ACe units as well) painted in special "heritage" schemes as part of their revived "heritage" program in 2012 (aside from the railroad's 20th anniversary and corporation's 30th) to commemorate the railroad's pedecessors and ancestry. Such units or locomotives are known simply as "heritage units".
*The Lehigh Valley and Norfolk And Southern (the original NS) heritage units both received numerous updates to make their once-slightly inaccurate schemes more accurate.
*Because of how many railroads became defunct during the same coincedental years, all of NS' heritage units aren't numbered like UP's fleet of SD70ACe heritage units.
*Iowa Interstate (IAIS) #513; an ES44AC, was also painted in a special scheme to dedicate the CRIP (Rock Island) railroad's heritage, primarily because of how the actual railroad operates mostly over former Rock Island trackage.
*IAIS #516, another ES44AC, was also painted in a CRIP commemorative scheme, made to resemble the red and yellow scheme, but with "Iowa Interstate" text on the sides of the unit. This has earned the unit the nickname "McGevo" due to its paint looking similar to McDonalds coloring.
*In October 2020, Canadian National announced that it had revealed 5 new heritage units: 4 ET44ACs and one SD70M-2; 3069 is painted in the Wisconsin Central red and yellow scheme, 3023 is painted in the Elgin, Joliet and Eastern Orange scheme, 3008 is painted in the Illinois Central Death Star scheme, and 3115 is painted in the BC Rail red, white and blue scheme. The other heritage unit is SD70M-2 #8952 painted in the Grand Trunk Western red and blue scheme.
==Gallery==
UP 7912.jpg|Another view of UP #7912.
All NS heritage units.jpg|All NS heritage units on display in Spencer, North Carolina in 2012, of which half are ES44ACs.
Es44C4.JPG|BNSF ES44C4 6621 Posing In Front With H3 Paint|link=GE Evolution Series
909 BNSF GE ES44AC #5726, Waukesha, Wi. Jul '10.jpg|BNSF ES44AC #5726 leads a Green Bay bound coal train on the CN in Waukesha, WI, Jul 2010. This unit is one of the pre-production units. Note the AC4400CW class on the frame.
1370 CN GE ET44AC #3045, Waukesha, Wi. Jun '16.jpg|CN ET44AC #3045, Waukesha, Wi. Jun 2016
165 CP GE ES44AC #8779, Duplainville, Wi. Nov '12.jpg|A pair of ES44ACs lead a westbound freight at Duplainville, Wi.
==Refs==
* GE.ES44 Operating Manual
* finnmoller.dk
Category:Diesel locomotives
Category:GE locomotives
Category:American locomotives