GE AC4400CW

File:UP AC44CW 6625 in Rochelle, IL.jpg

UP AC44CW #6655 sits with a Union Pacific Railroad GE Evolution Series ES44AC #7494.

The GE AC4400CW, sometimes referred as "AC44CW", is a diesel-electric locomotive that was built by GE Transportation Systems between 1993 and 2004. It is similar to the Dash 9-44CW, but uses AC traction motors instead of DC, with a separate inverter per motor.

3,018 units were built for North American railroads over an 11-year production and 540 AC44i units for the Brazilian railroads. In 2005, all Class I freight railroads except Norfolk Southern and Canadian National owned at least one AC4400CW. Norfolk Southern ordered the very similar C40-9Ws, although NS would later acquire 36 former CEFX AC4400CWs in August 2023. As a result of more stringent emissions requirements that came into effect in January 2005, GE no longer offers the AC4400CW, replacing it with the ES44AC.

File:CP Rail Loco No.9560.jpg

CP AC4400CW #9560 and CP SD40-2 #6029 head west towards the NS Elkhart Yard, 2009

File:KCS 4575 Ashland, NE 10-19-14 1.jpg

Kansas City Southern AC4400CW no. 4575 with self-steering trucks in October 2014

File:UP 5739 (AC44CWCTE), Roseville.jpg

UP 5739 (AC4400CW), in Roseville, CA

UP 6521 with a trailing ex Southern Pacific AC44CW

UP 6521 with a trailing ex Southern Pacific AC4400CW

Design variations

The AC4400CW was the first GE locomotive to offer an optional self-steering truck design, intended to increase adhesion and reduce wear on the railhead. This option was specified by Canadian Pacific Railway, Cartier Railway, CSX for their units 201-599, Ferromex, Ferrosur, and Kansas City Southern Railway. The other railroads still used the hi-ad truck design

CSX ordered many of its AC4400CW locomotives with extra weight to increase tractive effort. These same units were also modified in 2006-2007 with a "high tractive effort" software upgrade and redesignated CW44AH.

Rebuilds

In 2017, Canadian Pacific (now Canadian Pacific Kansas City) requested that General Electric modernize 30 of its 9500 and 9600-series AC4400CW units. The original units had the original front cab completely removed and upgraded to current GE standards with upgraded electrical systems including PTC and FTO systems. Other improvements GE has made include up to 10 percent fuel efficiency gains, 40 percent increase in reliability and 50 percent increase in haulage ability. The units were subsequently placed into service with the designation AC4400CWM (for Modernized). The first batch of rebuilds (8100–8129) also had their original Steerable trucks replaced with GEs High Adhesion trucks, where later batches each individual engine kept the trucks they already had.

The following year Canadian Pacific asked GE to similarly rebuild several more batches for a total of 110 locomotives. The second order (8130–8144) retains their steerable trucks. The third batch (8000–8064) will feature an Evolution Series sized fuel tank and radial trucks. In 2019 a fourth batch of rebuilds happened, 8145–8160 and 8064–8080 from the 95/9600-series. In 2021 the 8500 series is slated to be rebuilt as 8201–8280 and the 8100-series be completed.

The Union Pacific Railroad (UP) ordered many of their AC4400CWs with Controlled Tractive Effort software, giving them the designation of C44ACCTE. This software package is now standard on a portion of their ES44ACs as well. CTE limits tractive effort to mimic TE level of Dash series locomotives. In late 2023, they will all be rebuilt into C44ACMs.

In 2018, UP placed a small order for 20 rebuilds from GE of their AC4460CW fleet and later announced that they would be upgrading 1,000 of their AC4460CWs and AC44s into the new C44ACM class over the next 15 years. Unlike CP, the original 20 rebuilds did not receive a new crew cab.

CSX also placed orders to rebuild their large AC4400CW fleet. An initial batch of 10 AC4400CWs were rebuilt at Wabtec's Erie, Pennsylvania facility, with 40 more to follow. CSX continued the program and had received a total of 260 rebuilt locomotives by 2024. A final order has been placed to rebuild the remaining 200 plus locomotives and will be completed from 2024-2028. The rebuilds are numbered in the 7000-7600 series and CSX is referring to them as CM44ACs and CM44AHs.

NS recently acquired 36 of these locomotives from CEFX in June 2023. They are currently being patched for starting service on the roster. These units will be rebuilt to AC44C6M locomotives (similar to the ones from the Dash 9 locomotives) at the Wabtec locomotive plant in Fort Worth, TX. The first unit, NS 3980, was the first unit to be rebuilt into an AC44C6M and it's undergoing testing at the Wabtec facility. NS planned to rebuild 25 of the 36 of these units, but they failed to be delivered to NS. They were sold to Wabtec then to FXE.

Operators

AC4400CW owners and operators past and presentTemplate:Update inline include:

Owners	Qty	Numbers	Year delivered	Notes
Union Pacific	1,169	5554-5694, 5700-6081, 6430-6702, 6738-6887, 6995-6999, and 7080-7297	1994-2004	Most units rebuilt to C44ACMs. Units 6700-6702 were renumbered from 9997-9999. Minimal units were wrecked and retired. 5554-5694 and 5700-6081 are classified as C44ACCTE by UP. Unit 6759 rebuilt with the cab from a wrecked CN C44-9W.
CSX Transportation	594	3-174, 201-599, 5101-5122	1994-2002	Units to be rebuilt to CM44AC/CM44AHs and renumbered to 7000-7600 series. Some units were wrecked and retired before the rebuild. 365 was sold to Larry’s Truck and Electric in 2020 and scrapped. 1-14 were former 9100-9113. Unit 7005 (formerly 14) was wrecked in March 2023 and retired. 1 and 2 were renumbered to 173 (2nd) and 174 (2nd) respectively.
Canadian Pacific Kansas City	563	4500-4624, 8500-8580, 8600-8655, 9500-9683, 9700-9740, 9750-9784 and 9800-9840.	1995-2004	9777, 9782, 9758, and 9751 used during filming of Unstoppable. Most units rebuilt to AC4400CWMs. Renumbered to the 8000-8080, 8100-8178, and 8200-8210 series, and CPKC 4500-4574 are ex-TFM/KCSM 2600-2674. 4575-4624 were renumbered from 2000-2049. 9813 was wrecked and retired.
Southern Pacific	279	100-378	1995	All to Union Pacific 6145-6425. Units 145 and 224 destroyed in wreck in 1996, with 145's cab being reused on UP 9775, a C44-9W.
BNSF	121	5600-5717, 5838-5840	1999-2004	40 units leased to Metrolink from 2015 to 2016. 5701 was wrecked and scrapped. 5838-5840 are warranty protection units.
Ferromex	75	4500-4574	1998-2000	4508 was wrecked and retired.
CIT Group	59	1001-1059	2001-2004	1002 and 1006 sold to CMQ in 2017, and later returned in 2020s. 36 units sold to NS in 2023 and rebuilt to AC44C6Ms, but 25 of them were never delivered & later resold to FXE.
Ferrosur	38	4400-4437	2000-2004
Chicago and North Western Transportation Company	35	8801-8835	1994	All to Union Pacific which became #6703 - #6737 by UP. 6707 was wrecked and retired.
Cartier Railway	19	11-29	2001-2007
Quebec, North Shore and Labrador	12	415-426	2005-2006
Cerrejón	5	10010-10014	unknown
General Electric Corporation Leasing	11	2000, later renumbered 4400, 4000-4009	1993-1997	4000-4009 have been sold to UP as 7000-7009. 7007 has been rebuilt to C44ACM.
Ferrominera del Orinoco	2	1058-1059	2004
Norfolk Southern	36	3964-3999	2001-2004 (Acquired 2023)	Ex-CEFX. The units will be rebuilt into AC44C6M. The units were rebuilt but never delivered, and 25 were later sold to Wabtec, which resold them to FXE.
Totals	3,018

In popular culture

The plot of the movie Unstoppable required Denzel Washington and Chris Pine to climb aboard the lead locomotive of a runaway freight train. To film the movie, four Canadian Pacific AC4400CW locomotives (Nos. 9777, 9758, 9782, and 9751), were repainted as two fictional "Allegheny and West Virginia Railroad" locomotives (Nos. 777 (nicknamed "Triple 7") and 767). 9777 and 9782 were painted as 777, while 9758 and 9751 were painted as 767.