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The F7 was the fourth model in GM-EMD's successful line of F-unit locomotives, and by far the best-selling cab unit of all time. In fact, more F7s were built than all other F-units combined. The F7 succeeded the F3 model in GM-EMD's F-unit series, and was replaced in turn by the F9.
Minimum site dimensions were dictated by the distance and geometry required for the high-speed trains under development to reach their top speeds of 250 to 300 mph (400 to 480 km/h); the minimum specified radius of curvature was 2.5 mi (4.0 km), making the planned test track/guideway oval approximately 5 mi × 8 mi (8.0 km × 12.9 km).
The FT, introduced in 1939 with the new 1,350 hp (1.01 MW) 567 engine and Blomberg B trucks, was a successful design, and remained in production during WWII.. The F3 (1946) had a different roof arrangement that included the replacement of the FT's boxy dynamic brake structure with two under-roof grids, two exhaust stacks instead of four, and four cooling fans grouped together instead of ...
Santa Fe's aging fleet of F7 units were approaching retirement age in 1970. These units were remanufactured into switchers and named CF7. Santa Fe used them for a decade and sold many of them to short lines around the states. Many of those were still being used as of 2003. [4]
The design was based on the Electro-Motive Diesel EMD F7 locomotive. [1] The first 11 were delivered with EMD 16-567B, 1,119 kW (1,501 hp) engines and four powered axles with the remainder having 16-567C, 1,305 kW (1,750 hp) engines and six powered axles. The final 11 were fitted with dynamic braking. [2]
The "S" designation originally stood for six hundred horsepower and the "N" designation for nine hundred horsepower, although they were used for the more general designation of smaller and larger engine models after the more powerful 567 model engines replaced the Winton engines. The "C" designation stood for cast frame locomotives and the "W ...
In October 2010, Caterpillar announced it was investing US$50 million to acquire and to renovate an existing 740,000-square-foot (69,000 m 2) building for assembly of EMD brand locomotives and to build a locomotive test track on a 75-acre (0.30 km 2) site located in Muncie, Indiana. The Muncie facility allows EMD to supply locomotives to ...
An EMD E7, one of the American "bulldog noses" "Bulldog nose" is the nickname given, due to their appearance, to several cab-unit diesel-electric locomotives manufactured by GM-EMD and its licensees from 1939 to 1970. The term originated with EMD F-units, as well as later E-unit models such as the E7, E8, and E9.