The ES (Evolution Series) of locomotives were designed to meet the U.S. EPA's Tier 2 locomotive emissions standards that took effect in 2005. With a newly designed "GEVO-12" 12 cylinder engine, these AC traction locomotives have the same 4,400 horsepower as the 16 cylinder AC4400CW but produce fewer emissions and have greater fuel economy. Possibly their most identifiable trait is their oversized radiator, courtesy of a specially designed air-to-air dual fan heat exchanger. The CSX operates rail yards and routes throughout the Midwest and eastern United States, providing freight and coal services and carrying everything from domestic and international freight to orange juice.
