EMD SD7

Specifications
Specifications
Configuration:;
• AAR	C-C
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Trucks	EMD Flexicoil C
Wheel diameter	40 in (1,016 mm)
Minimum curve	23° (250 ft (76.20 m) radius)
Wheelbase	48 ft 7 in (14.81 m)
Length	61 ft 2+3⁄4 in (18.66 m)
Width	10 ft 8 in (3.25 m)
Height	15 ft 4+1⁄2 in (4.69 m)
Loco weight	309,000 lb (140,000 kg)
Fuel capacity	1,200 US gal (4,500 L; 1,000 imp gal)
Prime mover	EMD 16-567B
RPM range	800
Engine type	V16 diesel engine
Aspiration	Roots-type blower
Displacement	9,072 cu in (148.66 L)
Generator	D-12-C
Traction motors	(6) D-27-B
Cylinders	16

Type and origin
Type and origin
Power type	Diesel-electric
Builder	General Motors Electro-Motive Division (EMD)
Model	SD7
Build date	May 1951 – November 1953
Total produced	188

EMD SD7
EMD SD7
	SP #1518 inside Barn 9 at the Illinois Railway Museum in Union, Illinois on May 27, 2023.
Power type
Type and origin
Power type	Diesel-electric
Builder	General Motors Electro-Motive Division (EMD)
Model	SD7
Build date	May 1951 – November 1953
Total produced	188
Configuration:;
Specifications
Configuration:;
• AAR	C-C
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Trucks	EMD Flexicoil C
Wheel diameter	40 in (1,016 mm)
Minimum curve	23° (250 ft (76.20 m) radius)
Wheelbase	48 ft 7 in (14.81 m)
Length	61 ft 2+3⁄4 in (18.66 m)
Width	10 ft 8 in (3.25 m)
Height	15 ft 4+1⁄2 in (4.69 m)
Loco weight	309,000 lb (140,000 kg)
Fuel capacity	1,200 US gal (4,500 L; 1,000 imp gal)
Prime mover	EMD 16-567B
RPM range	800
Engine type	V16 diesel engine
Aspiration	Roots-type blower
Displacement	9,072 cu in (148.66 L)
Generator	D-12-C
Traction motors	(6) D-27-B
Cylinders	16
Maximum speed
Performance figures
Maximum speed	65 mph (105 km/h)
Power output	1,500 hp (1.12 MW)
Tractive effort	77,250 lbf (343,600 N)
Locale
Career
Locale	United States
Disposition	Some still in service, others preserved

The EMD SD7 is a model of 6-axle diesel locomotive built by General Motors Electro-Motive Division between May 1951 and November 1953. It had an EMD 567B 16-cylinder engine producing 1,500 horsepower (1.12 MW) for its six traction motors. United States railroads bought 188 units.

This was the first model in EMD's SD (Special Duty) series of locomotives, a lengthened B-B GP7 with a C-C truck arrangement. The two extra axles and traction motors are useful in heavy, low-speed freight service. EMD continues to produce SD series locomotives to this day. Some SD7s both high and short-hood can still be found in service today on shortline railroads and industrial operators, although most Class I roads stopped using these locomotives by the 1970s and 1980s.