The EMD SD75M and EMD SD75I are a series of similar

diesel-electric locomotive A diesel locomotive is a type of railway locomotive in which the power source is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving whee ...

s produced by General Motors Electro-Motive Division between 1994 and 1996. The series is an improvement and extension to the

EMD SD70 series The EMD SD70 is a series of diesel-electric locomotives produced by the US company Electro-Motive Diesel. This locomotive family is an extension and improvement of the EMD SD60 series. Production commenced in late 1992 and since then over 5,700 ...

, which further is an extension to the

EMD SD60 The EMD SD60 is a , six-axle diesel-electric locomotive built by General Motors Electro-Motive Division, intended for heavy-duty drag freight or medium-speed freight service. It was introduced in 1984, and production ran until 1995. History an ...

. These locomotives were built as a response to

General Electric General Electric Company (GE) was an American Multinational corporation, multinational Conglomerate (company), conglomerate founded in 1892, incorporated in the New York (state), state of New York and headquartered in Boston. Over the year ...

's Dash 9-44CW, where as their cousins, the SD70MAC, were built in response to

's AC4400CW. By increasing the output of the 16-710-G3 engine from , the SD75 was a reality. The "M" in the model designation is the style of the cab, in this case the North American style cab. The "I" model has an "Isolated Cab", or a "WhisperCab" in EMD speak, which reduces noise and vibration in the cab. This type of cab is recognized by a seam separating the nose and cab components. This seam is the rubber that damps vibration and cuts down on noise, because the cab is not attached directly to the frame on the unit. This was the last model that used the "I" designation in the model name; all further units had the isolated cab, but the model designation continued to use the "M". Buyers included

Canadian National The Canadian National Railway Company () is a Canadian Class I freight railway headquartered in Montreal, Quebec, which serves Canada and the Midwestern and Southern United States. CN is Canada's largest railway, in terms of both revenue an ...

, the largest buyer with 175 units (now 173),

Burlington Northern Santa Fe BNSF Railway is the largest freight railroad in the United States. One of six North American Class I railroads, BNSF has 36,000 employees, of track in 28 states, and over 8,000 locomotives. It has three Transcontinental railroad, transcontine ...

with 26 (now 24), and

Ontario Northland Railway The Ontario Northland Railway is a Canadian railway operated by the Ontario Northland Transportation Commission, a Crown agency (Ontario), provincial Crown agency of the government of Ontario. Originally built to develop the Lake Timiskaming ...

with 6 (now 5). Both models use the HTCR radial truck and are mounted on the frame. This M model only sold 76 units and was not as popular as the SD70. The biggest buyer of this model was the

Atchison, Topeka and Santa Fe Railway The Atchison, Topeka and Santa Fe Railway , often referred to as the Santa Fe or AT&SF, was one of the largest Class 1 railroads in the United States between 1859 and 1996. The Santa Fe was a pioneer in intermodal freight transport; at vario ...

, now

, with 51 units; an additional 25 were delivered in early 1996, during the merger process. The Santa Fe's SD75Ms were the railroad's last new locomotives, with the last new unit, number 250, built in August 1995. Mainly built for a special request from Santa Fe/BNSF, the SD75Ms are slightly more powerful than SD70Ms, having horsepower ratings between & 4500 hp. They are almost identical to SD70Ms, but can be distinguished by the added bulge below the inertial air-intake on the right side of the unit. In September 2014,

Norfolk Southern The Norfolk Southern Railway is a Class I freight railroad operating in the Eastern United States. Headquartered in Atlanta, the company was formed in 1982 with the merger of the Norfolk and Western Railway and Southern Railway. The comp ...

purchased 7 SD75Ms via

National Railway Equipment Company National Railway Equipment Company is an American railroad equipment rebuilding, leasing, and manufacturing company, headquartered in Mt. Vernon, Illinois. NREC sells new and rebuilt locomotives to railroad companies worldwide, with an emphasis ...

. They were retired by 2020.

SD75M operators

SD75I operators

SD75IACC operators

SD75I gallery

File:BNSF 8287 EMD SD75I.jpg, BNSF #8287 File:CN5654@Capreol,ON.jpg, CN #5654 File:19971012 01 CN Lacrosse, WI (6112221596).jpg, CN #5743 File:CN5800 Dacotah,MB.png, CN #5800

References

External links

EMD SD75I Operator's Manual – Canadian National Nos. 5626 thru 5730

Locomotive Truck EMD HTCR
{{Santa Fe "Super Fleet" SD75M C-C locomotives Diesel–electric locomotives of the United States Freight locomotives Railway locomotives introduced in 1994 Atchison, Topeka and Santa Fe Railway locomotives Canadian National Railway locomotives