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The Evolution Series is a line of diesel locomotives built by GE Transportation Systems, designed to meet the U.S. EPA's Tier 2 locomotive emissions standards that took effect in 2005. The first pre-production units were built in 2003. Evolution Series locomotives are equipped with either AC or DC traction motors, depending on the customer's preference. All are powered by the GE GEVO engine. The Evolution Series was named as one of the "10 Locomotives That Changed Railroading" by industry publication Trains Magazine. It was the only locomotive introduced after 1972 to be included in that list. The ES44AC (Evolution Series, 4400 HP, AC traction) replaces the AC4400CW model in GE's range. These locomotives have been ordered by Union Pacific Railroad (who refers to these locomotives as the C45ACCTE), BNSF Railway, Norfolk Southern Railway, Kansas City Southern Railway, Kansas City Southern de Mexico, Ferromex, and Canadian Pacific Railway. Iowa Interstate Railroad ordered 12 ES44ACs in April 2008 to be delivered by October 2008 to handle an expected traffic growth of 25%-30%, resulting from new ethanol plants coming on line. Iowa Interstate ordered two additional ES44ACs to be delivered in December 2009. The Evolution Series locomotives are visually similar to the Dash 9 and AC4400CW, although small differences are evident. The most significant differences are in the radiator section at the rear of the locomotive; the "wings" at the end of the carbody are larger, as is the entire radiator of the locomotive. As with the AC6000CW the radiators project beyond the end of the hood, and unlike any previous GE locomotive the grills under the radiator are at two different angles. The increase in radiator size is due to the necessity of greater cooling capacity in the locomotive in order to reduce emissions. The other major difference between the Evolution Series locomotives and older models are the vents below the radiators, which are larger than those on previous GE locomotives. [READ THE REST OF THIS ARTICLE]
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