EMD F3

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EMD F3
BN #9762, ex-NP #6502, leading the North Coast Hiawatha into Yakima, Washington in August 1971.
Type and origin Power type Diesel-electric Builder General Motors Electro-Motive Division (EMD) Model F3 Build date July 1945 – February 1949 Total produced 1,111 A units, 696 B units
Specifications Configuration: ​  • AAR B-B Gauge 4 ft 8+1⁄2 in (1,435 mm) Trucks Blomberg B Wheel diameter 40 in (1,016 mm) Minimum curve 23° (250.79 ft or 76.44 m radius) Wheelbase 39 ft (11.89 m) Length 50 ft 8 in (15.44 m) Width 10 ft 8 in (3.25 m) Height 15 ft (4.57 m) Loco weight 234,000 lb (106,000 kg) Fuel capacity 1,200 US gal (4,500 L; 1,000 imp gal) Prime mover EMD 16-567B RPM range 275-800 Engine type Two-stroke V16 diesel Aspiration Roots-type supercharger Displacement 9,072 cu in (148.66 L) Generator EMD D-12 Traction motors (4) EMD D-17-B or D-27-B Cylinders 16 Cylinder size 8+1⁄2 in × 10 in (216 mm × 254 mm)
Performance figures Maximum speed 103 mph (166 km/h) Power output 1,500 hp (1.1 MW) Tractive effort 55,000 lb (25,000 kg)

The EMD F3 is a 1,500-horsepower (1,100 kW) B-B freight- and passenger-hauling carbody diesel locomotive produced between July 1945 and February 1949 by General Motors’ Electro-Motive Division. Final assembly was at GM-EMD's La Grange, Illinois plant. A total of 1,111 cab-equipped lead A units and 696 cabless booster B units were built.

The F3 was the third model in GM-EMD's highly successful F-unit series of cab unit diesel locomotives, and it was the second most produced of the series. The F3 essentially differed from the EMD F2 in that it used the “new” D12 generator to produce more power and from the later EMD F7 in electrical equipment. Some late-model F3's had the same D27 traction motors, along with the heavier-duty electrical cables, used in the F7, and were referred to as model F5 by EMD's Engineering Department.