The Evolution Series Tier 4400 AC traction or ET44AC for short is a 6 axle North American train locomotive. This engine was made by General Electric (now Wabtec) as their first engine with Tier 4 emission standards. What I find unique about this engine is it's large radiator near the rear of the train. Though CSX doesn't own the ET44AC they do however own the ET44AH which is a heavier version of the ET44AC. All units are now equipped with a Nathan Airchime K5HL-R2 and a Graham White electronic bell. Please correct me if any information is wrong and comment your thoughts on this beautiful engine. Hear are some close ups of the engine in several different railroad liveries.