The EMD F40PH is a four-axle 3,000–3,200 hp (2.2–2.4 MW) B-B diesel-electric locomotive built by General Motors Electro-Motive Division in several variants from 1975 to 1992. Intended for use on Amtrak's short-haul passenger routes, it became the backbone of Amtrak's diesel fleet after the failure of the EMD SDP40F. The F40PH also found widespread use on commuter railroads in the United States and with Via Rail Canada. Additional F40PH variants were manufactured by Morrison-Knudsen and MotivePower Industries between 1988 and 1998, mostly rebuilt from older locomotives.
Amtrak retired its fleet of F40PHs in the mid-1990s in favor of the GE Genesis, but the locomotive remains the mainstay of Via Rail's long-distance trains and an image of the locomotive hauling the Canadian was featured on the frontier series of the Canadian $10 bill. The F40PHs are still a common sight on many other commuter railroads throughout the United States, and a semi-rare sight on freight railroads. In addition, Amtrak has kept a number of de-engined F40PHs in use as cab cars.
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