The EMD DDM45 is a meter-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 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.

EMD DDM45
EFVM 861, an EMD DDM45.
Type and origin
Power typeDiesel
BuilderGeneral Motors Electro-Motive Division
ModelDDM45
Build date1970 - 1976
Total produced83
Specifications
Configuration:
 • AARD-D
 • UICDo′Do′
Gauge1,000 mm (3 ft 3+38 in) metre gauge
Wheel diameter1,016 mm (40.0 in)
Minimum curve83 m (272 ft 4 in)
Length22.352 m (73 ft 4 in)
Width3.127 m (10 ft 3 in)
Height4.754 m (15 ft 7 in)
Axle load20.25 t (19.93 long tons; 22.32 short tons)
Loco weight162 t (159 long tons; 179 short tons)
Fuel capacity10,333 L (2,730 US gal; 2,273 imp gal)
Prime moverEMD 20-645E3
Engine typeV20 Two-stroke diesel
AlternatorEMD AR-10B3
Traction motors8x EMD D29
Cylinders20
Transmissiondiesel electric
Performance figures
Maximum speed84.9 km/h (52.8 mph)
Power output3,600 hp (2,700 kW)
Tractive effort39,657 kgf (388.90 kN)
39,657 kgf (87,430 lbf)
Factor of adh.25%
Career
OperatorsE. F. Vitória a Minas
LocaleBrazil

However, a large locomotive like an SD45 with its three-axle trucks was not readily adaptable to the EFVM's meter 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 bogies, 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

See also

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