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Description:
ES44AC Tier 4 Locomotive, Lettered for Union Pacific, With Susan Koman Pink Ribbon (Cancer Awareness) logo. In August 2012 GE released its Tier 4 ES44AC prototype, this locomotive looks very different from a Tier 2/3 ES44AC. GE is now in the process of building 20 more Tier 4 ES44AC's. Tier 4 regulations started on Jan 1st , 2015. This Tier is the final and most stringent of the standards. Several Tier 4 ES44AC's are testing on the UP over Donner Pass and in the Powder River Basin.
Tier 4 ES44AC's retain most features of previous ES44AC's, but they have raised humps in the middle, as well as a larger, more sloped radiator in back with two cooling fans. GE currently rosters six Tier 4 ES44AC demo units (GECX #2015, 2020-2014). Only #2015 has an official paint scheme of blue, white and green, while #2020-2024 have a basic solid blue scheme.