This phase is where Union Pacific 5248 - 5309 and 5311 - 5312 was built between February 2006 - June 2006. The ES44AC (Evolution Series, 4,400 hp, AC traction) replaced the AC4400CW model in the General Electric catalogue. These locomotives have been ordered by every Class I railroad in North America: Union Pacific Railroad (who refers to these locomotives as the C45ACCTE), BNSF Railway, CSX Transportation, Norfolk Southern Railway, Ferromex, CPKC Railway, and Canadian National Railway.
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