EMD DDM45

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.

EMD DDM45
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
Specifications Configuration: ​  • AAR D-D  • UIC Do'Do' Gauge 1,000 mm (3 ft 3 3⁄8 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%
Career Operators E. F. Vitória a Minas Locale Brazil

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: