The GE AC4400CW is a 4400 hp diesel-electric locomotive that was built by GE Transportation Systems

GE Transportation Systems

GE Transportation, formerly known as GE Rail, is a division of General Electric. The organization manufactures equipment for the railroad, marine, mining, drilling and energy generation industries. It is based in Erie, Pennsylvania. Locomotives are assembled at the Erie plant, while engine...

 between 1993 and 2004. It is similar to the Dash 9-44CW

GE Dash 9-44CW

The GE C44-9W is a 4,400 hp diesel locomotive built by GE Transportation Systems of Erie, Pennsylvania. Keeping in tradition with GE's locomotive series nicknames beginning with the "Dash 7" of the 1970s, the C44-9W was dubbed the Dash 9 upon its debut in 1993. The design has since proven popular...

, but features AC traction motors instead of DC, with a separate inverter per motor. 2,598 examples of this locomotive were produced for North American railroads. As a result of more stringent emissions requirements that came into effect in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 on January 1, 2005, the AC4400CW has been replaced by the GE ES44AC.

As of 2005, every Class I railroad

Class I railroad

A Class I railroad in the United States and Mexico, or a Class I rail carrier in Canada, is a large freight railroad company, as classified based on operating revenue.Smaller railroads are classified as Class II and Class III...

 with the exceptions of Norfolk Southern

Norfolk Southern Railway

The Norfolk Southern Railway is a Class I railroad in the United States, owned by the Norfolk Southern Corporation. With headquarters in Norfolk, Virginia, the company operates 21,500 route miles in 22 eastern states, the District of Columbia and the province of Ontario, Canada...

 and Canadian National

Canadian National Railway

The Canadian National Railway Company is a Canadian Class I railway headquartered in Montreal, Quebec. CN's slogan is "North America's Railroad"....

 owns at least one AC4400CW. These units quickly gained a reputation as powerful freight haulers, especially in heavy-haul applications.

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, Cartier Railway, CSX, Ferromex, Ferrosur, and KCS.

Design Variations

CSX ordered many of its AC4400CW locomotives with 20000 lb (9,071.8 kg) extra weight to increase tractive effort. These same units were also modified in 2006-2007 with a "high tractive effort" software upgrade. CSX has redesignated these modified units from CW44AC to CW44AH.

Operators

AC4400CW current owners, as of August 21, 2006, include:

Railroad	Qty	Notes
BNSF BNSF Railway The BNSF Railway is a wholly owned subsidiary of Berkshire Hathaway Inc., and is headquartered in Fort Worth, Texas. It is one of seven North American Class I railroads and the second largest freight railroad network in North America, second only to the Union Pacific Railroad, its primary...	121
Canadian Pacific Canadian Pacific Railway The Canadian Pacific Railway , formerly also known as CP Rail between 1968 and 1996, is a historic Canadian Class I railway founded in 1881 and now operated by Canadian Pacific Railway Limited, which began operations as legal owner in a corporate restructuring in 2001...	447	9751, 9758, 9777, and 9782 were used in the 2010 film Unstoppable Unstoppable (2010 film) Unstoppable is a 2010 American action thriller film directed by Tony Scott, written by Mark Bomback, and starring Denzel Washington and Chris Pine. The film tells the story of a runaway freight train, and the two men who attempt to stop it.The film was released in the United States and Canada on... , and retain the "caution stripe" painted snowplows from their movie liveries
Cartier Railway Cartier Railway The Cartier Railway is a privately owned railway that operates 260 miles of track in the Canadian province of Québec. It is operated by the Cartier Railway Company, a wholly owned subsidiary of Arcelor Mittal, formerly Québec Cartier Mining Company...	17
CSX Transportation CSX Transportation CSX Transportation operates a Class I railroad in the United States known as the CSX Railroad. It is the main subsidiary of the CSX Corporation. The company is headquartered in Jacksonville, Florida, and owns approximately 21,000 route miles...	615	CSX designation CW44AC, or CW44AH with HTE software
Ferromex Ferromex Ferromex is a private rail consortium that operates the largest railroad in Mexico.-Description:...	75
Ferrosur	38
Kansas City Southern Kansas City Southern Railway The Kansas City Southern Railway , owned by Kansas City Southern Industries, is the smallest and second-oldest Class I railroad company still in operation. KCS was founded in 1887 and is currently operating in a region consisting of ten central U.S. states...	175
Quebec, North Shore and Labrador Quebec North Shore and Labrador Railway The Quebec North Shore and Labrador Railway is a Canadian regional railway that stretches through the wilderness of northeastern Quebec and western Labrador. It connects Labrador City, Labrador, with the port of Sept-Îles, Quebec, on the north shore of the St. Lawrence River...	12	Numbered 415 to 426
Union Pacific Union Pacific Railroad The Union Pacific Railroad , headquartered in Omaha, Nebraska, is the largest railroad network in the United States. James R. Young is president, CEO and Chairman....	1338	many from Southern Pacific and Chicago & North Western