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DDM45 861 EFVM Vinicius Secchin.JPG
EFVM 861, an EMD DDM45.
Type and origin
Power type Diesel
Builder General Motors Electro-Motive Division
Model DDM45
Build date 1970 - 1976
Total produced 83
 • AAR D-D
 • UIC Do'Do'
Gauge 1,000 mm (3 ft 3 38 in) metre gauge
Wheel diameter 1,016 mm (40.0 in)
Minimum curve 83 m (272 ft)
Length 22.352 m (73.33 ft)
Width 3.127 m (10.26 ft)
Height 4.754 m (15.60 ft)
Axle load 20.25 t (19.93 long tons; 22.32 short tons)
Loco weight 162 t (159 long tons; 179 short tons)
Fuel capacity 10,333 L (2,730 US gal; 2,273 imp gal)
Prime mover EMD 20-645-E3
Engine type V20 Two-stroke diesel
Alternator EMD AR-10B3
Traction motors 8x EMD D29
Cylinders 20
Transmission diesel electric
Performance figures
Maximum speed 84.9 km/h (52.8 mph)
Power output 3,600 hp (2,700 kW)
Tractive effort 39,657 kgf (388.90 kN)
39,657 kgf (87,430 lbf)
Factor of adh. 25%
Operators E. F. Vitória a Minas
Locale Brazil

The EMD DDM45 is a narrow gauge diesel-electric locomotive built by EMD. The DD in the name means that it has eight axles in two trucks, giving it a D-D wheel arrangement, while the M stands for the meter gauge track it was to operate on, and the 45 represents the EMD's SD45 that the engine was derived from. They were built for service on the Estrada de Ferro Vitória a Minas (EFVM) in Brazil. In the early 1970s, the EFVM needed not only to expand its locomotive roster, but to use the most powerful single-engined locomotives available, and the SD45 represented the highest-rated model that EMD had to offer at the time.

However, a big locomotive such as an SD45 with its three-axle trucks wasn't readily adaptable to the EFVM's narrow gauge trackage. The smaller traction motors of the meter gauge locomotive were unable to handle the full current capacity from the 3,600 hp (2,700 kW) prime mover. EMD proposed using a meter gauge version of the Flexicoil-D four-axle trucks, similar to those found under the domestic DD35, DD35A and DDA40X locomotive models. The two additional traction motors of this design allowed full power to be used.

Roster of DDM45s:

Order number Build date Serial numbers Country Railroad Numbers Quantity
711197-711208 February 1970 - March 1970 34671-34682 Brazil E. F. Vitória a Minas 801-812 12
711441-711448 March 1970 - April 1970 36303-36310 Brazil E. F. Vitória a Minas 813-820 8
711871-711880 March 1971 37278-37287 Brazil E. F. Vitória a Minas 821-830 10
712613-712621 March 1973 - April 1973 712613-712621 Brazil E. F. Vitória a Minas 831-839 9
713096-713119 January 1974 - April 1974 713096-713119 Brazil E. F. Vitória a Minas 840-863 24
713726-713735 October 1975 - December 1975 713726-713735 Brazil E. F. Vitória a Minas 864-873 10
748027-1 to -10 January 1976 - March 1976 748027-1 to 748027-10 Brazil E. F. Vitória a Minas 874-883 10

External links[edit]

Media related to EMD DDM45 locomotives at Wikimedia Commons