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The SD70MAC is no longer produced due to EPA regulations, and was replaced by the SD70ACe in 2004. In total, 1,109 SD70MACs were produced, purchased by Burlington Northern (and its successor, BNSF), Conrail, CSX, Transportación Ferroviaria Mexicana (TFM; units now owned by Kansas City Southern Railway (KCS)), and the Alaska Railroad.
BNSF Railway (reporting mark BNSF) is the largest freight railroad in the United States. One of six North American Class I railroads , BNSF has 36,000 employees, [ 1 ] 33,400 miles (53,800 km) of track in 28 states, and over 8,000 locomotives. [ 2 ]
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It was powered by a 20-cylinder version of EMD's 710G prime mover, and was the second diesel locomotive by GM-EMD to use a V20 engine, since EMD's SD45 series. It introduced a wide radiator housing similar to GE Transportation locomotives and the placement of dynamic brakes at the rear of the locomotive, which is a quieter location, features ...
Although four demonstrator SD60MAC units tested on the Burlington Northern proved the viability of EMD's AC traction system, all subsequent orders were for the SD70MAC locomotive. SOO Line EMD SD60 #6032 GMD SD60F, CN 5536 EMD SD60I, CSX 8747, Plymouth, Michigan EMD SD60M (Early model, "Triclops"), UP 2317 EMD SD60M (Late model,
These locomotives were built as a response to General Electric's Dash 9-44CW, where as their cousins, the SD70MAC, were built in response to General Electric's AC4400CW. By increasing the output of the 16-710-G3 engine from 4,000 to 4,300 horsepower (3,000 to 3,200 kW), the SD75 was a reality.
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A nickname given to EMD's SD70MAC, SD80MAC, and SD90MAC locomotive models [46] Big Orange A nickname given to BNSF, named after their orange livery Billboard Atchison, Topeka and Santa Fe Railway locomotive in the pre-1972 blue and yellow scheme [16] Black Widow A Southern Pacific locomotive (all black with some silver) [16] Bloody Nose