The EMD SD75M and EMD SD75I are a series of diesel-electric locomotives produced by General Motors Electro-Motive Division between 1994 and 1996. The series is an improvement and extension to the EMD SD70 series, which further is an extension to the EMD SD60. These locomotives shared its microprocessor with the EMD SD70 & SD60.

These locomotives were built as a response to General Electric's Dash 9-44CW. 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.

SD75M The SD75M is a diesel-electric locomotive built by GM-EMD. It is a further extension to the 70's series, but can be distinguishable from the SD70M by the bulge below the inertial air-intake on the right side of the unit. But, however, it was not successful, as it sold only 76 units. Buyers were Santa Fe Railway and BNSF Railway. Soon, Progress Rail (PRLX) acquired three Santa Fe SD75M locomotives. PRLX locomotives are distinguishable by the original railroad's name being hidden by black patches, on both sides and the nose. PRLX was written on both the sides on the patches.

SD75I

The SD75I has an isolated cab in EMD's range. This is indicated by the "I" designation, which means that it 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, similar to the SD70I and SD60I. 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. Models like the SD60I, SD70I, etc. used the "I" designation. 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 largest buyer with 175 units (now 173), Burlington Northern Santa Fe with 26 (now 24), and Ontario Northland Railway with 6 (now 5).

Other Both models use the HTCR radial truck and are mounted on the frame. The M model sold only 76 units and was not as popular as the SD70I. The biggest buyer of this model was the Atchison, Topeka and Santa Fe Railway, now Burlington Northern Santa Fe, 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. PRLX then acquired 3 consecutive Santa Fe SD75M's, numbered 231, 232, and 249.

Mainly built for a special request from Santa Fe/BNSF, the SD75Ms are slightly more powerful than SD70Ms, having horsepower ratings between & 4,500 hp.

In September 2014, Norfolk Southern purchased 7 SD75Ms via National Railway Equipment Company. They were retired by 2020.

SD75IACC The SD75IACC is a rebuild of Canadian National's SD75I's by Progress Rail, and entered service in July 2024. These replace the DC traction system with an AC traction system. The program started in 2023.

SD75M operators +RailroadQuantityRoad NumbersNotes Atchison, Topeka and Santa Fe Railway51200–250To BNSF 8200–8250, then back to 200–250. Units 202, 209, 218, 222, 225, 229, and 230 to Norfolk Southern 2800–2806. Rest sold to PRLX.BNSF Railway258251–8275Renumbered to 251–275.Progress rail3Numbered 231, 232, and 249Ex-Santa Fe SD75M, 231 had gray patchesTotals 76

SD75I operators Owners Qty Numbers Notes Year delivered BNSF Railway 26 8276–8301 BNSF Roster @ The Diesel Shop 8276–8299 renumbered to 276–299, 8300–8301 renumbered to 249–250 1997 Canadian National Railway 175 now 125 5626–5800 CN Roster @ The Diesel Shop 50 units to be rebuilt as SD75IACCs by 2023-24. CN 5637, 5658, 5717 & 5753 were wrecked and retired. 1996-1999 Ontario Northland Railway 6 now 5 2100–2105 ONR Roster @ The Diesel Shop Unit 2100 was wrecked and retired in 2012. 1997–1999Totals 207

SD75IACC operators

Owners Qty Numbers Notes Year delivered Canadian National Railway 50 8300-8349 CN Roster @ The Diesel Shop Rebuilt from SD75Is 1996-1999 (originally), 2023-2024Totals 50

References

External links

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

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