These UP and CP ES (Evolution Series) are built by GE Transportation Systems and designed to meet the U.S. EPA's Tier 2 locomotive emissions standards that took effect in 2005. To promote these new locomotives and the newer, “greener”, engines, GE advertised their new eco-friendlier locomotives with a series of demonstrator units, painted in a distinctive blue and green and emblazoned with the GE Logo on the nose and sides. Many of these locomotives are retained by GE’s locomotive division and see continued use as promotional locomotives.

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