The ES (Evolution Series) of locomotives are built by GE Transportation Systems and designed to meet the U.S. EPAs Tier 2 locomotive emissions standards that took effect in 2005. These Evolution Series locomotives are equipped with AC traction motors and are powered by a newly designed GEVO-12 12 cylinder engine that produces the same power as the 16 cylinder AC4400CW, but with fewer emissions and greater fuel economy. It also carries a redesigned air-to-air dual-fan heat exchanger, which gives it its distinct oversized radiator; a common spotting feature for these new locomotives.

ES44DC:While the AC version has proven to be the overall most popular iteration of the GEVO, quite a few railroads elected to use the DC versions of these engines, including the BNSF Railway, Canadian National, and CSX.

ES44C4:The C4 is a variant of the ES44AC, using an A1A-A1A wheel arrangement with an idler axle in the center of each truck vs. the all-wheel power of its ES44AC brethren. This gives the engines the stability benefits of a six axle truck while reducing the number of traction motors from 6 to 4.

• Multiple body styles to reflect different as delivered railroad specifications
• Powerful five-pole KATO motor with dual brass flywheels
• Directional Headlight and illuminated, preprinted numberboards
• Illuminated ditch lights
• Kato magnetic knuckle coupler
• Drop in DCC compatible with theTCS K1D4,Digitrax DN163K1C,andNCE N14K1.
• For DCC/Sound use theESU 58741