Model of 1500 hp Co′Co′ American diesel locomotive
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EMD SD7
SP 1518 at the Illinois Railway Museum
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
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 supercharger
Displacement
9,072 cu in (148.66 L)
Generator
D-12-C
Traction motors
(6) D-27-B
Cylinders
16
Performance figures
Power output
1,500 hp (1.12 MW)
Tractive effort
77,250 lbf (343,600 N)
Career
Locale
United States
Disposition
Some still in service, others preserved
The EMDSD7 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.[1]
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.[2][3]
^Pinkepank, Jerry A (1973). The Second Diesel Spotter's Guide. Kalmbach Books. p. 71. LCCN 66-22894.
^Guss, Chris (May 16, 2023). "EMD's pioneering SD7 and SD9 locomotives". Trains Newsletter. Kalmbach Media. Retrieved May 16, 2023.
^Solomon, Brian (2014). GE and EMD Locomotives: The Illustrated History. Voyageur Press. p. 249. ISBN 978-0-7603-4612-9.
The EMDSD7 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...
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its successors General Motors Electro-Motive Division (GM-EMD) and Electro-Motive Diesel (EMD). EMC participated in the construction of a number of motorized...
The EMD SD7R (sometimes known as the EMD SD7E) was a rebuild from EMDSD7 diesel locomotives that were built by General-Motors Electro-Motive Division...
is an EMDSD7, and was the first ever SD series diesel locomotive, originally built in May 1951 as General Motors Electro-Motive Division's (EMD) prototype...
The EMD 567 is a line of large medium-speed diesel engines built by General Motors' Electro-Motive Division. This engine, which succeeded Winton's 201A...
needed] The SD9 was the second model of EMD's SD (special duty) line of locomotives, following the SD7. Just as the SD7 was a lengthened GP7 with two additional...
(the EMD SD24, the EMD SD24B, the EMDSD7, and the EMD SD35) to 2000 horsepower roadswitchers powered by EMD 645E prime movers, resulting in the EMD SD20...
model in EMD's GP (General Purpose) series of locomotives. Concurrently, EMD offered a six-axle (C-C) SD (Special Duty) locomotive, the SD7. The GP7 was...
Central Gulf's Paducah Shops as a conversion from the EMDSD7, EMD SD24, SD24B (cabless), and EMD SD35 locomotives. The program involved rebuilding the...
with the Nebraska Zephyr and only surviving EMD E5. The 1993 movie Groundhog Day featured the museum's EMD SD24 diesel locomotive. The museum's grounds...
The EMD SD9E was a rebuild from EMD SD9 diesel locomotives that were built by General-Motors Electro-Motive Division for the Southern Pacific Transportation...
Illinois Railway Museum. Retrieved 2008-06-27. Alberston, Bob. (1996). "EMDSD7-SP 1518, A precursor to all engines on rails today". Railfan & Railroad...
run on the FW&D mainline from Fort Worth to Wichita Falls with an idling EMDSD7, four boxcars, and a caboose, but en route, the locomotive broke down from...
Sister engine Tooele Valley Railway #11 on static display in Utah. 401 EMDSD7 August 1952 New Active at Los Angeles Department of Water & Power's Intermountain...
Northern #558 EMDSD7 1952 1983 Donated 2017 Jackson Street Roundhouse Stored awaiting restoration Lake Superior Terminal & Transfer #101 EMD NW2 1948 ?...
using SP Locomotive No. 5325, an EMDSD7 equipped with a steam boiler; it left the shortly thereafter, as the SD7 was unable to match the performance...
They bought from all the manufacturers: Alco 516 units, Baldwin 643 units, EMD 1,479 units, Fairbanks-Morse 200 units, General Electric 145 units, and Lima...
Electro-Motive Division produces its first six-axle freight diesel locomotive, an SD7. It tours as demonstrator number 990 before being sold to the Southern Pacific...
regular service, as well as an SD7. PNWR also operated a few unique locomotives, including the former PNWR 3300 (which was an EMD SD40-3MR), as well as one...
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