•YEARS BUILT: 2003-present
•MANUFACTURER: General Electric
•OPERATED ON: Most North American Class I freight railroads
•NAMES: ES40DC, ES44DC, ES44AC, ES44C4, ET44AC, ET44C4
•QUANTITY: 7,325 as of Dec. 31, 2017
•HORSEPOWER: 4,400
•KNOWN FOR: Primary freight locomotive of the early 21st century in North America
•STATUS: Many operating in North America