The EMD F40C is a 6-axle 3,200 horsepower (2.4 MW) diesel-electric locomotive built by General Motors Electro-Motive Division in 1974 for commuter service in Chicago. EMD only built 15 locomotives; the decline of the 6-axle design for passenger service led to the adoption of the 4-axle EMD F40PH as the standard passenger locomotive in the United States.[1] Along with a small fleet of HEP-equipped EMD SD70MAC locomotives operating on the Alaska Railroad, the F40Cs were the last six-axle passenger locomotives in daily service in mainland North America until the delivery of Metra's first SD70MACH in 2022.