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EMD FT
The EMD FT was a diesel-electric locomotive produced between November 1939 and November 1945, by General Motors' Electro-Motive Division (the "F" stood for 1400 horsepower (rounded from 1350) and the "T" for twin, as it came standard in a two-unit set). All told 555 cab-equipped A units were built, along with 541 cabless booster B units, for a grand total of 1,096 units. The locomotives were all sold to customers in the United States. It was the first model in EMD's very successful F-unit series of cab unit freight diesels, and was the locomotive that convinced many U.S. railroads that the diesel-electric freight locomotive was the future. Many rail historians consider the FT one of the most important locomotive models of all time.
See EMD 567 for specific information on the history of the 567 medium-speed two-stroke cycle Diesel engine, as employed in the FT and its many successors. In 1951, E. W. Kettering wrote a paper for the ASME entitled, ''History and Development of the 567 Series General Motors Locomotive Engine'', which goes into great detail about the technical obstacles that were encountered during the development of the 567 engine (these same considerations apply to its successors, the 645 and 710).
FTs were generally marketed as semi-permanently coupled A-B sets (a lead unit and a cabless booster connected by a solid drawbar) making a single locomotive of . Many railroads used pairs of these sets back to back to make up a four-unit A-B-B-A locomotive rated at . Some railroads purchased semi-permanently coupled A-B-A three-unit sets of , while a few, like the Santa Fe, ordered all their FTs with regular couplers on both ends of each unit for added flexibility. All units in a consist could be run from one cab; multiple unit (MU) control systems linked the units together. "Hostler" controls were an option for B units, enabling these units to be operated independently of A units for moving within yard limits.
==Engine and powertrain==
The FT introduced a 16-cylinder version of the 567 (later 567A) series engine developing at 800 rpm. Designed specifically for railroad locomotives, this naturally-aspirated (Roots-blown) two stroke 45 degree V type, with an bore by stroke giving displacement per cylinder, remained in production until 1966. A D8 D.C. generator provides power to four D7 traction motors, two on each truck, one on each axle, in a B-B arrangement. The Blomberg design introduced here has been EMD’s standard B truck, used with few exceptions through the F59PHI of 1994. EMD has built all its own components since 1939.〔Pinkepank 1973, pp. 12, 26, 90.〕
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