Boston & Maine 690 (ex Illinois Terminal 2301) with Train EDRJ (East Deerfield–Rotterdam Jct) about to enter Hoosac Tunnel, May 27,2007. Photo by William Stone, Jr.

By The original uploader was Gp38 at English Wikipedia - Transferred from en.wikipedia to Commons., CC BY 2.5,

Boston & Maine 690 (ex Illinois Terminal 2301) with Train EDRJ (East Deerfield–Rotterdam Jct) about to enter Hoosac Tunnel, May 27,2007. Photo by William Stone, Jr.
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EMD SD39 Diesel-Electric Locomotive
The SD39 is a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between August 1968 and May 1970. 54 were built for American railroads.

In 1966 EMD replaced all their old models with new ones having the new 645 diesel. These included six-axle models SD38, SD40, SDP40 and SD45; the SD39 was added in 1968. All shared standard components including the frame, cab, traction alternator, trucks, traction motors, and air brakes. The difference was the power output:

SD38: 2,000 hp (1,490 kW) from a non-turbocharged V16

SD39: 2,300 hp (1,720 kW) from a turbocharged V12

SD40: 3,000 hp (2,240 kW) from a turbocharged V16

SD45: 3,600 hp (2,680 kW) from a turbocharged V20.

The SD39 had the smallest prime mover and therefore had the most unused space above the frame, inside the hood between the main generator and electrical cabinet, and outside in large end "porches".

A variant was the SDL39, ordered by the Milwaukee Road. Shorter and lighter than a stock SD39, these minimized weight per axle.

Original Owners
Purchasers of the SD39 include:

Atchison, Topeka and Santa Fe Railway
Quantity: 20
Road numbers: 4000-4019

Illinois Terminal Railroad
Quantity: 6
Road numbers: 2301-2306
Notes: 4 went to Guilford Rail System, all have been scrapped.

Minneapolis, Northfield and Southern Railway
Quantity: 2
Road numbers: 40-41
Notes: No. 40 used by Progressive Rail.

Southern Pacific Transportation Company
Quantity: 26
Road numbers: 5300-5325

Total Units: 54

Dash 2 rebuilds
On January 1, 1972, EMD debuted Dash 2 models. No SD39-2s were built as new units, but a number of SD39s were rebuilt to Dash 2 specifications.

Some of the SD39 model were subsequently resold to other operators including:

FEPASA - 14 SD39-2s numbered 2350-2363; the last seven, 2358-2363, rebuilt as SD39-2M by NRE.
TRANSAP - 4 SD39-3M locomotives rebuilt by MPI de Mexico numbered D2301-D2304.

EMD SD39 Overview
Type and origin
Power type: Diesel-electric
Builder: General Motors Electro-Motive Division (EMD)
Model: SD39
Build date: August 1968 – May 1970
Total produced: 54
​ • AAR C-C
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver diameter: 40 in (1,016 mm)
Length: 65 ft 9 1⁄2 in (20.05 m)
Prime mover: EMD 12-645E3
Engine type: V12 diesel
Aspiration: turbocharged
Cylinders: 12
Locomotive brake: Independent air; optional: dynamic brakes
Train brakes: Air, schedule 26-L
Performance figures
Power output: 2,300 hp (1,720 kW)
Locale: United States

See also:

GM - Electro Motive Division

EMD Diesel-Electric Locomotives

Diesel Locomotives