EMD SD75M
BNSF SD75M No. 8231
Type and origin
Power typeDiesel-electric
BuilderGeneral Motors Electro-Motive Division (EMD)
ModelSD75M
Build date1994 – 1996
Total produced280 (76 SD75M, 204 SD75I)
Specifications
Configuration:
​
 • AARC-C
Gauge4 ft 8+1⁄2 in (1,435 mm)
Prime moverEMD 16-710-G3
Cylinders16
Transmissiondiesel electric
Performance figures
Power output4,300 horsepower (3,200 kW)
Career
OperatorsBurlington Northern Santa Fe[1]
NumbersBNSF 200–201, 203–208, 210–217, 219–221, 223–224, 226–228, 231–275, renumbered from 8200–8275. NS 2800–2806.
DispositionIn service as of 2019

The EMD SD75M and EMD SD75I are a series of similar diesel-electric locomotives produced by General Motors Electro-Motive Division between 1994 and 1996. The series was an improvement and extension to the EMD SD70 series, as a response to General Electric's Dash 9-44CW. 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. 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 largest buyer with 175 units (now 173), Burlington Northern Santa Fe with 26 (now 24), and Ontario Northland Railway with 6 (now 5).

Both models use the HTCR radial truck and are mounted on the 72-foot-4-inch (22.05 m) 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, 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.[2]

Mainly built for a special request from Santa Fe/BNSF, the SD75Ms are slightly more powerful than SD70Ms, having horsepower ratings between 4,300 hp (3,200 kW) & 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 purchased 7 SD75Ms via National Railway Equipment Company.[3]

SD75M operators

Railroad Quantity Road Numbers Notes
Atchison, Topeka and Santa Fe Railway 51 200–250 To 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 Railway 25 8251–8275 Renumbered to 251–275.

SD75I operators

Owners Qty Numbers Notes Year delivered
BNSF Railway26 8276–8301 [4] 8276–8299 renumbered to 276–299, 8300–8301 renumbered to 249–250 1997
Canadian National Railway173 5626–5800[5] Some units to be rebuilt as SD75ACCs by 2023. CN 5658 & 5753 withdrawn 1996
Ontario Northland Railway5 2100–2105[6] Unit 2100 was wrecked and retired in 2012. 1997–1999

References

  1. ↑ The Diesel Shop, http://www.thedieselshop.us/, Burlington Northern Santa Fe Roster
  2. ↑ Brian Solomon (7 October 2013). Classic Locomotives: Steam and Diesel Power in 700 Photographs. MBI Publishing Company. p. 480. ISBN 978-1-61058-868-3.
  3. ↑ "NS Diesel Locomotive Roster - EMD SD75M Nos. 2800-2806". www.nsdash9.com. Archived from the original on 2014-12-03.
  4. ↑ BNSF BNSF Roster @ The Diesel Shop
  5. ↑ Canadian National CN Roster @ The Diesel Shop
  6. ↑ Ontario Northland ONR Roster @ The Diesel Shop

Media related to EMD SD75M locomotives at Wikimedia Commons Media related to EMD SD75I locomotives at Wikimedia Commons

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