The GE AC4400CW, sometimes referred as "AC44CW" is a 4,400 horsepower (3,300 kW) diesel-electric locomotive that was built by GE Transportation Systems between 1993 and 2004. Similar to the Dash 9-44CW, the AC44CW uses AC traction motors instead of DC, using a separate inverter per motor. In appearance, the AC4400CW is somewhat similar to GE's more powerful locomotive, the AC6000CW.

2,834 units were built for North American railroads over an 11-year production. 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 on January of that year, GE no longer offers the AC4400CW, replacing it with the ES44AC.

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

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

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.[citation needed] The other railroads still used the hi-ad truck design

CSX ordered many of its AC4400CW locomotives with 20,000 lb (9,100 kg) 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.