description GE ES44AC Overview
The GE ES44AC is a six-axle, AC-traction diesel-electric freight locomotive produced by GE Transportation as part of its Evolution Series. Introduced in 2003, it is rated at 4,400 horsepower and was designed to meet stricter EPA Tier 0, Tier 1, and Tier 2 emissions standards. It features a GEVO 12-cylinder engine and is one of the most common locomotives operated by major North American Class I freight railroads.
help GE ES44AC FAQ
What does ES44AC mean in the GE locomotive's name?
The name identifies an Evolution Series locomotive rated at 4,400 horsepower with AC traction motors. Its six powered axles give it the starting effort needed for heavy North American freight trains.
Which railroads operate GE ES44AC locomotives?
Large fleets have served railroads including Union Pacific, Norfolk Southern, and Canadian Pacific. Closely related Evolution Series variants also operate for BNSF and other major North American freight carriers.
How can an ES44AC be distinguished from an older GE AC4400CW?
The ES44AC belongs to GE's newer Evolution Series and uses a GEVO engine rather than the AC4400CW's older 7FDL power plant. Changes to the radiator section, cooling system, and emissions equipment also produce visible spotting differences.
Why is the ES44AC so common on long freight trains?
Its AC traction system provides strong low-speed adhesion, which is valuable when starting coal, intermodal, and manifest trains. The 4,400-horsepower design also supports distributed-power operation, with locomotives placed at different points in a train.
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