EMD SD40 Diesel-Electric Locomotive
The EMD SD40 is a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between January 1966 and August 1972.

Design
Like its predecessor in EMD's catalog, the SD35, the SD40 is a high-horsepower, six-motor freight locomotive.

In 1966, EMD updated its locomotive catalog with entirely new models, all powered by the new 645 diesel engine. These included six-axle models SD38, SD40, SDP40 and SD45. All shared standardized components, including the frame, cab, generator, trucks, traction motors, and air brakes. The primary difference was the power output: SD38 = 2,000 hp (1,490 kW) from a non-turbocharged V16, SD40 = 3,000 hp (2,240 kW) from a turbocharged V16, and SD45 = 3,600 hp (2,680 kW) from a turbocharged V20.

Original Owners
856 examples of this locomotive model were built for American railroads, 330 were built for Canadian railroads, 72 were built for Mexican railroads, 6 were built for the Guinea-Boke Project, and 4 SD40Ms riding on 5 ft 3 in (1,600 mm) gauge trucks were exported to Brazil.

Built by EMD at McCook, Illinois

Built: 6/66

Serial number: 31766
Phase: Ia2
Railroad: Atlanta and St. Andrews Bay 
Road number: 506
Quantity: 1
Notes: No dynamic brakes.

Built: 3/66-5/66

Serial numbers: 32036-32055
Railroad: Atchison, Topeka and Santa Fe 
Road numbers: 1700–1719
Quantity: 20

Built: 10/71-11/71

Serial numbers: 5801-1 - 5801-24
Phase: IIc
Railroad: Burlington Northern 
Road numbers: 6300-6324
Quantity: 25

Built: 5/67

Serial numbers: 33161-33173
Phase: Ic
Railroad: Baltimore & Ohio 
Road numbers: 7482-7497
Quantity: 13
Notes: Drop grabs on nose.

Built: 4/69

Serial numbers: 34775-34778
Phase: IIb_
Railroad: Baltimore & Ohio 
Road numbers: 7497-7500
Quantity: 4

Built: 8/66-9/66

Serial numbers: 32092-32100
Phase: Ia2
Railroad: Chicago Great Western 
Road numbers: 401-409
Quantity: 9

Built: 1/66-2/66

Serial numbers: 31263-31282
Phase: Ia1
Railroad: Chicago & North Western 
Road numbers: 867-886
Quantity: 20
Notes: No dynamic brakes, 867 first SD40 built.

Built: 4/66

Serial numbers: 31760-31765
Phase: Ia2
Railroad: Chicago & North Western
Road numbers: 887-892
Quantity: 6
Notes: No dynamic brakes.

Built: 9/66

Serial number: 32314
Phase: Ia2
Railroad: Chicago & North Western
Road number: 893
Quantity: 1
Notes: No dynamic brakes.

Built: 2/67

Serial numbers: 32686-32688
Phase: Ib2
Railroad: Chicago & North Western
Road numbers: 894-896
Quantity: 3
Notes: No dynamic brakes.

Built: 7/66-8/66

Serial numbers: 31929-31948
Phase: Ia2
Railroad: Chesapeake & Ohio 
Road numbers: 7450-7469
Quantity: 20

Built: 5/67

Serial numbers: 33154-33160
Phase: Ic
Railroad: Chesapeake & Ohio
Road numbers: 7475-7481
Quantity: 7
Notes: Drop grabs on nose.

Built: 4/69

Serial numbers: 34779-34784
Phase: IIb_
Railroad: Chesapeake & Ohio
Road numbers: 7501-7506
Quantity: 6

Built: 6/70

Serial numbers: 36696-36705
Phase: IIb2
Railroad: Chesapeake & Ohio
Road numbers: 7507-7516
Quantity: 10

Built: 7/70

Serial numbers: 36746-36755
Phase: IIb2
Railroad: Chesapeake & Ohio
Road numbers: 7517-7526
Quantity: 10

Built: 3/71

Serial numbers: 37204-37213
Phase: IIc
Railroad: Chesapeake & Ohio
Road numbers: 7527-7536
Quantity: 10

Built: 10/67

Serial numbers: 33516-33519
Phase: IIa2
Railroad: Colorado & Southern
Road numbers: 875-878
Quantity: 4
Notes: To Burlington Northern, same numbers.

Built: 4/68

Serial numbers: 33918-33926
Phase: IIb1
Railroad: Colorado & Southern
Road numbers: 879-887
Quantity: 9
Notes: To Burlington Northern, same numbers.

Built: 9/66

Serial numbers: 32141-32148
Phase: Ia2
Railroad: Clinchfield
Road numbers: 3000-3007
Quantity: 8

Built: 9/68

Serial number: 34177
Phase: IIb_
Railroad: Clinchfield
Road number: 3008
Quantity: 1

Built: 9/68

Serial numbers: 34742-34747
Phase: IIb_
Railroad: Clinchfield
Road numbers: 3009-3014
Quantity: 6

Built: 6/71

Serial numbers: 37417-37422
Phase: IIc
Railroad: Clinchfield
Road numbers: 3015-3020
Quantity: 6

Built: 6/71

Serial numbers: 37538-37541
Phase: IIc
Railroad: Clinchfield
Road numbers: 3021-3024
Quantity: 4

Built: 4/70

Serial numbers: 36124-36129
Phase: IIb2
Railroad: Detroit Edison 
Road numbers: 001-006
Quantity: 6
Notes: Numbers out of sequence.

Built: 7/72

Serial numbers: 5817-1 - 5817-2
Phase: III
Railroad: Detroit Edison
Road numbers: 013-014
Quantity: 2

Built: 7/72

Serial numbers: 5818-1 - 5818-3
Phase: III
Railroad: Detroit Edison
Road numbers: 015-017
Quantity: 3

Built: 6/66

Serial number: 31799
Phase: Ia2
Railroad: GM
Road number: 10
Quantity: 1
Notes: No dynamic brakes.

Built: 2/66

Serial numbers: 31007-31018
Phase: Ia1
Railroad: Gulf, Mobile & Ohio 
Road numbers: 901-912
Quantity: 12

Built: 9/66

Serial numbers: 32161-32169
Phase: Ia2
Railroad: Gulf, Mobile & Ohio
Road numbers: 913-921
Quantity: 9

Built: 8/69

Serial numbers: 35184-35195
Phase: IIb_
Railroad: Grand Trunk Western 
Road numbers: 5900-5911
Quantity: 12
Notes: No dynamic brakes.

Built: 1/70

Serial numbers: 35831-35839
Phase: IIb2
Railroad: Grand Trunk Western
Road numbers: 5912-5920
Quantity: 9

Built: 9/70

Serial numbers: 36887-36895
Phase: IIb2
Railroad: Grand Trunk Western
Road numbers: 5921-5929
Quantity: 9
Notes: No dynamic brakes.

Built: 12/67

Serial numbers: 33244-33249
Phase: IIa2
Railroad: Illinois Central 
Road numbers: 6000-6005
Quantity: 6
Notes: No dynamic brakes.

Built: 8/69

Serial numbers: 34939-34951
Phase: IIb_
Railroad: Illinois Central
Road numbers: 6006-6018
Quantity: 13
Notes: SD40A: 70 ft 8 in (21.54 m) frame, 5,000-US-gallon (19,000 l; 4,200 imp gal) fuel tank.

Built: 1/70

Serial numbers: 35685-35689
Phase: IIb2
Railroad: Illinois Central
Road numbers: 6019-6023
Quantity: 5
Notes: SD40A: 70 ft 8 in (21.54 m) frame, 5,000-US-gallon (19,000 l; 4,200 imp gal) fuel tank.

Built: 10/66-11/66

Serial numbers: 32101-32114
Phase: Ib1
Railroad: Kansas City Southern 
Road numbers: 600-613
Quantity: 14
Notes: Some units equipped with Locotrol.

Built: 8/68

Serial numbers: 33958-33965
Phase: IIb_
Railroad: Kansas City Southern
Road numbers: 614-621
Quantity: 8
Notes: Some units equipped with Locotrol.

Built: 6/70

Serial numbers: 35493-35498
Phase: IIb2
Railroad: Kansas City Southern
Road numbers: 622-627
Quantity: 6
Notes: Some units equipped with Locotrol, numbers out of sequence.

Built: 3/71

Serial numbers: 35840-35847
Phase: IIc
Railroad: Kansas City Southern
Road numbers: 628-635
Quantity: 8
Notes: Some units equipped with Locotrol.

Built: 3/71

Serial number: 38363
Phase: IIc
Railroad: Kansas City Southern
Road number: 636
Quantity: 1

Built: 6/66-9/66

Serial numbers: 32088-32091
Phase: Ia2
Railroad: Louisville & Nashville
Road numbers: 1225–1228
Quantity: 4

Built: 4/69

Serial numbers: 34758-34762
Phase: IIb_
Railroad: Louisville & Nashville
Road numbers: 1229–1233
Quantity: 5

Built: 4/70

Serial numbers: 35948-35952
Phase: IIb2
Railroad: Louisville & Nashville
Road numbers: 1234–1238
Quantity: 5

Built: 8/70-9/70

Serial numbers: 36809-36818
Phase: IIb2
Railroad: Louisville & Nashville
Road numbers: 1239–1248
Quantity: 10

Built: 5/71

Serial numbers: 38203-38212
Phase: IIc
Railroad: Louisville & Nashville
Road numbers: 1249–1258
Quantity: 10

Built: 1/68-2/68

Serial numbers: 33771-33784
Phase: IIb1
Railroad: Missouri Pacific
Road numbers: 720-733
Quantity: 14
Notes: No dynamic brakes.

Built: 2/69

Serial numbers: 34504-34523
Phase: IIb_
Railroad: Missouri Pacific
Road numbers: 734-753
Quantity: 20
Notes: No dynamic brakes.

Built: 1/70

Serial numbers: 35725-35740
Phase: IIb2
Railroad: Missouri Pacific
Road numbers: 754-769
Quantity: 16
Notes: No dynamic brakes.

Built: 3/71-4/71

Serial numbers: 37543-37562
Phase: IIc
Railroad: Missouri Pacific
Road numbers: 770-789
Quantity: 20
Notes: No dynamic brakes.

Built: 3/67-4/67

Serial numbers: 32968-32987
Phase: Ib2
Railroad: Missouri Pacific
Road numbers: 700-719
Quantity: 20
Notes: No dynamic brakes.

Built: 5/66-6/66

Serial numbers: 31899-31928
Phase: Ia2
Railroad: Norfolk & Western
Road numbers: 1580–1609
Quantity: 30
Notes: High short hood.

Built: 5/71

Serial numbers: 35605-35619
Phase: IIc
Railroad: Norfolk & Western
Road numbers: 1610–1624
Quantity: 15
Notes: High short hood.

Built: 12/70-1/71

Serial numbers: 36896-36926
Phase: IIb2
Railroad: Penn Central
Road numbers: 6240-6270
Quantity: 31

Built: 1/71-2/71

Serial numbers: 36997-37010
Phase: IIb2
Railroad: Penn Central 
Road numbers: 6271-6284
Quantity: 14

Built: 2/66-3/66

Serial numbers: 31285-31349
Phase: Ia12, Ia2
Railroad: Pennsylvania Railroad
Road numbers: 6040-6104
Quantity: 65

Built: 4/69-5/69

Serial numbers: 34889-34898
Phase: IIb_
Railroad: SOO Line
Road numbers: 736-745
Quantity: 10
Notes: No dynamic brakes.

Built: 3/70

Serial numbers: 36099-36102
Phase: IIb2
Railroad: SOO Line
Road numbers: 746-749
Quantity: 4
Notes: No dynamic brakes.

Built: 5/71

Serial numbers: 37425-37431
Phase: IIc
Railroad: SOO Line
Road numbers: 750-756
Quantity: 7
Notes: No dynamic brakes.

Built: 4/71

Serial numbers: 37355-37370
Phase: IIc
Railroad: Southern
Road numbers: 3170-3185
Quantity: 16
Notes: High short hood.

Built: 12/71-1/72

Serial numbers: 7375-1 - 7375-15
Phase: III
Railroad: Southern
Road numbers: 3186-3200
Quantity: 15
Notes: High short hood.

Built: 1/66-5/66

Serial numbers: 31491-31569
Phase: Ia1,Ia2
Railroad: Southern Pacific 
Road numbers: 8400-8478
Quantity: 79
Notes: Numbers out of sequence.

Built: 4/68-6/68

Serial numbers: 33671-33680
Phase: IIb_
Railroad: Southern Pacific
Road numbers: 8479-8488
Quantity: 10

Built: 10/66-12/66

Serial numbers: 32400-32434
Phase: Ib1
Railroad: Union Pacific
Road numbers: 3048-3082
Quantity: 35

Built: 4/66

Serial numbers: 31414-31438
Phase: Ia2
Railroad: Union Pacific 
Road numbers: 3000-3024
Quantity: 25

Built: 4/66

Serial numbers: 31575-31589
Phase: Ia2
Railroad: Union Pacific 
Road numbers: 3025-3039
Quantity: 15

Built: 8/71-9/71

Serial numbers: 37639-37653
Phase: IIc
Railroad: Union Pacific 
Road numbers: 3083-3097
Quantity: 15

Built: 9/71-10/71

Serial numbers: 37904-37928
Phase: IIc
Railroad: Union Pacific 
Road numbers: 3098-3122
Quantity: 25

Built: 8/66

Serial numbers: 32134-32138
Phase: Ia2
Railroad: Western Maryland 
Road numbers: 7470-7474
Quantity: 5

Built: 11/68

Serial numbers: 34104-34105
Phase: IIb_
Railroad: Western Maryland
Road numbers: 7495-7496
Quantity: 2

Built: 7/69

Serial numbers: 34967-34971
Phase: IIb_
Railroad: Western Maryland
Road numbers: 7445-7449
Quantity: 5

Built by GMD at London, Ontario

Built: 10/71

Serial numbers: A2561-A2563
Railroad: Algoma Central
Road numbers: 180-182
Quantity: 3

Built: 9/67

Serial numbers: A2246-A2253
Railroad: Canadian National
Road numbers: 5000-5007
Quantity: 8

Built: 10/67-12/68

Serial numbers: A2260-A2327
Railroad: Canadian National
Road numbers: 5008-5075
Quantity: 68
Notes: No dynamic brakes.

Built: 2/69-11/69

Serial numbers: A2335-A2369
Railroad: Canadian National
Road numbers: 5076-5110
Quantity: 35
Notes: No dynamic brakes.

Built: 11/69-12/69

Serial numbers: A2370-A2391
Railroad: Canadian National
Road numbers: 5111-5132
Quantity: 22

Built: 12/69-4/71

Serial numbers: A2392-A2434
Railroad: Canadian National
Road numbers: 5133-5175
Quantity: 43
Notes: No dynamic brakes.

Built: 4/71-11/71

Serial numbers: A2493-A2542
Railroad: Canadian National
Road numbers: 5176-5225
Quantity: 50
Notes: No dynamic brakes.

Built: 11/71-12/71

Serial numbers: A2588-A2602
Railroad: Canadian National
Road numbers: 5226-5240
Quantity: 15
Notes: No dynamic brakes.

Built: 7/66

Serial numbers: A2133-A2164
Phase: Ia2
Railroad: Canadian Pacific
Road numbers: 5500-5531
Quantity: 32
Notes: Nose brakewheel.

Built: 12/66

Serial numbers: A2177-A2209
Railroad: Canadian Pacific
Road numbers: 5532-5564
Quantity: 33

Built: 7/68

Serial numbers: A2328-A2333
Railroad: Quebec North Shore and Labrador
Road numbers: 200-205
Quantity: 6

Built: 6/71

Serial numbers: A2543-A2557
Railroad: Quebec North Shore and Labrador
Road numbers: 206-220
Quantity: 15

SD40's Built by EMD at McCook, Illinois or GMD at London, Ontario for Import

Built: 4/67 at McCook, IL

Serial numbers: 32228-32231
Railroad: RFFSA (Brazil)
Road numbers: 3701-3704
Quantity: 4
Notes: 5 ft 3 in (1,600 mm) Broad gauge.

Built: 5/68 at McCook, IL

Serial numbers: 33385-33403
Railroad: Mexican National (NdeM)
Road numbers: 8503-8521
Quantity: 19

Built: 3/68 at McCook, IL

Serial numbers: 33895-33897
Railroad: Mexican National (NdeM)
Road numbers: 8500-8502
Quantity: 3

Built: 12/71 at McCook, IL

Serial numbers: 38893-38932
Phase: III
Railroad: Mexican National (NdeM)
Road numbers: 8536-8575
Quantity: 40

Built: 8/72 at McCook, IL

Serial numbers: 37894-37899
Railroad: BOKE (Africa)
Road numbers: 101-106
Quantity: 6
Notes: Companie de Bauxite du Guinea.

Built: 1/72 at London, Ontario

Serial numbers: A2603-A2612
Railroad: Mexican National (NdeM)
Road numbers: 8576-8585
Quantity: 10
Notes: Low-nose headlight, bell between number boards.
(Phases by Robert Sarberenyi)

Derivatives and Experimental
The very first test bed SD40, EMD 434, constructed on an SD35 frame in July 1964 was in active service until retired by Canadian National Railway in March 2009 and donated to the Monticello Railway Museum in July 2009, albeit having been upgraded to an "SD40-2R", as Illinois Central 6071.

18 customized SD40s were built for the Illinois Central Railroad as model SD40A, using the longer SDP45 frame, which allowed for a larger 5000 gallon fuel tank.

Versions of the SD40 modified for the Australian loading gauge were sold to WAGR and Victorian Railways as their L and C classes respectively.

The SD40 was succeeded by an upgraded Dash 2 version called the SD40-2.

SD40 Rebuilds
After having been succeeded by the more modern SD40-2, a large proportion of SD40 have been upgraded with more modern equipments. The main difference between rebuilt SD40 and genuine SD40-2 is that the latter uses a longer frame and has longer front and rear porches while the rebuilt SD40 have a shorter frame.

A common product of rebuilding SD40s, and sometimes SD40-2s, is an SD40-3. The major addition denotes that the rebuilt unit or units as an SD40-3 is the addition of a microprocessor, and sometimes other modern components. The usual reasons for installing a microprocessor are improved traction control, and better fuel economy (via better injection control). Also, electronic control over braking systems (independent and automatic). This may include some SD39, SD45 and SD45-2 rebuilt to SD40-2 standards.

The SD40R is a rebuild of all the Southern Pacific's SD40 between 1980 and 1981. 30 SD40 have been rebuilt as SD40M-2 by Morrison Knudsen for Southern Pacific alongside 97 SD45 and 6 SDP45. The SD40-2XR designates 15 SD40 and a SDP40 rebuilt to Dash-2 standards for Montana Rail Link. The SD40E is an SD50 rebuilt by the Norfolk Southern Railway and derated to 3000 HP (equivalent to an SD40-2).

Preservation
BNSF SD40 No. 6308 (built 1966 for ATSF) was gifted by the railroad to the Walt Disney Hometown Museum in Marceline, Missouri on October 30, 2017.
CP SD40 No. 5500 is preserved at the Revelstoke Railway Museum of Revelstoke, BC. It was CP's first SD40, built in 1966 at GMD's London plant and was retired in 2001. The unit was donated to the museum in 2007. Plans are being made to restore the locomotive to its original look as it was when ordered, including a repaint into its original grey/tuscan red paint scheme, known as the Canadian Pacific "Script".

CN SD40 No. 5232 (built November 1971) has been purchased by The Vintage Locomotive Society on January 10, 2015, from Cando Contracting and the Central Manitoba Railway. It is being used for revenue service by Prairie Rail Solutions, a wholly owned subsidiary of the Society. The unit has been repainted completely black, with Prairie Rail Solutions lettering and logos.

IC SD40-2R No. 6071, the first SD40 built, is preserved at the Monticello Railway Museum in Monticello, Illinois. It was originally the demonstrator for EMD, having the number No. 434. It was sold to the Gulf Mobile & Ohio and it became GM&O No. 950. The GM&O was later merged into the Illinois Central Railroad and became Illinois Central Gulf No. 6071, then later rebuilt into an SD40-2R for the IC. It was donated March 11, 2009. The engine is fully functional, however it needs new traction motors if it were to operate again.

In mid December, 2014, it was revealed that Norfolk Southern had set aside two SD40 units, that were retired in 2007, for preservation:
NS SD40 No. 1580, built as Norfolk & Western No. 1580, the first SD40 of the N&W. As of August 3, 2016, the locomotive was being worked on at the Juniata Shops in Altoona for eventual service & preservation.
NS SD40 No. 3170, built as Southern No. 3170, the first SD40 of the SOU. It was restored to operating condition at the Juniata Shops in Altoona, Pennsylvania, and then sent to the NS Paint shops at the Debutts Yard in Chattanooga, Tennessee, where it made its public debut February 27, 2015. It operated on the NS Piedmont Division. On May 18, 2016, it was donated to the Tennessee Valley Railroad Museum by Norfolk Southern.

EMD SD40 Overview
Type and origin
Power type: Diesel-electric
Builder: GM Electro-Motive Division (EMD), General Motors Diesel (GMD)
Model: SD40
Build date: January 1966 – August 1972
Total produced: 1,268
Specifications
Configuration:
​ • AAR C-C
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge, 5 ft 3 in (1,600 mm), Brazil
Wheel diameter: 40 in (1,016 mm) diameter
Length: 65 ft 8 in (20.02 m) over the coupler pulling faces
Width: 10 ft 0 in (3.05 m)
Height: 15 ft 5 1⁄4 in (4.71 m)
Locomotive weight: 360,000 lb (160,000 kg)
Fuel capacity: 3,200 US gal (12,000 l; 2,700 imp gal)
Lubricant capacity: 243 US gal (920 l; 202 imp gal)
Coolant capacity: 295 US gal (1,120 l; 246 imp gal)
Sandbox capacity: 56 cu ft (1.6 m3)
Prime mover: EMD 16-645-E3
Engine type: V16 diesel
Aspiration: turbocharged
Alternator, main: AR-10
Alternator, auxiliary: D14
Traction motors: D-77
Cylinders: 16
Locomotive brake: Independent air / optional: dynamic brakes
Train brakes: Air, schedule 26-L
Performance figures
Maximum speed: 83 mph (134 km/h)
Power output: 3,000 hp (2,240 kW)
Career
Locales: North America, South America, Africa

See also:

Electro Motive Diesel

EMD Diesel-Electric Locomotives

Diesel-Electric Locomotives

Locomotives

General Motors Diesel Canada

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Former CN SD40, CCGX 5232, Working on the Central Manitoba Railway in Winnipeg, Manitoba, September 20, 2014.

By Taylorover9002 - Taking a picture., CC BY-SA 4.0, https://en.wikipedia.org/w/index.php?curid=52958702

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Former CN SD40, CCGX 5232, Working on the Central Manitoba Railway in Winnipeg, Manitoba, September 20, 2014.
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