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BNSF / ATSF No. 8231, a 4,300 horsepower EMD SD75M diesel-electric locomotive on September 4, 2000. Photo by K.L. Whitehead.

By KLWhitehead - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4812212

EMD SD75M Diesel-Electric Locomotive
The EMD SD75M is a series of diesel-electric locomotives produced by General Motors Electro-Motive Division between 1994 and 1996. The series was a response to General Electric's Dash 9-44CW. By increasing up 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 SD75I has an "Isolated Cab", or a "WhisperCab" in EMD speak, which reduces noise and vibration in the cab. Both models use the HTCR radial truck and are mounted on the 72-foot-4-inch (22.05 m) frame. This 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 SD75M's were the railroad's last new locomotives, with the very last new unit, number 250, built in August 1995.

Mainly built for a special request from Santa Fe/BNSF, the SD75M's are slightly more powerful than SD70M's, 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 SD75M's via National Railway Equipment Company.

EMD SD75M Overview
Type and origin
Power type: Diesel-electric
Builder: General Motors Electro-Motive Division (EMD)
Model: SD75M
Build date: 1994 – 1996
Total produced: 76
Specifications
Configuration:
​ • AAR C-C
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Prime mover: EMD 16-710-G3
Cylinders: 16
Transmission: diesel electric
Performance figures
Power output: 4,300 horsepower (3,200 kW)

Career
Operators: Burlington Northern Santa Fe
Numbers: BNSF 200-201, 203-208, 210-217, 219-221, 223-224, 226-228, 231-275, renumbered from 8200-8275. NS 2800-2806.
Disposition: In service as of 2014

See also:

GM Electro-Motive Division

EMD Diesel-Electric Locomotives

Diesel Locomotives

Locomotives

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