FM H-12-46

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FM H-12-46
Type and origin
Power type Diesel
Builder Fairbanks-Morse
Model H-12-44
Build date October 1951 —
January 1953
Total produced 30
Specifications
Configuration:
 • AAR A1A-A1A
Gauge 4 ft 8 12 in (1,435 mm)
Prime mover FM 38D-6
Engine type 2-stroke diesel
Aspiration Roots blower
Displacement 6,222 in³ (101.8 L)
Cylinders 6 (Opposed piston)
Cylinder size 8.125 in × 10 in
(206 mm × 254 mm)
Transmission DC generator,
DC traction motors
Loco brake Straight air
Train brakes Air
Performance figures
Maximum speed 60  mph (97 km/h)
Power output 1,200 hp (895 kW)
Career
Locale North America

The FM H-12-46 was a light road switcher of Fairbanks-Morse design manufactured exclusively by the Canadian Locomotive Company from October, 1951–January, 1953 for the Canadian National Railway. Only thirty of the 1,200 hp, six-cylinder opposed piston engine locomotives were produced. The units (assigned #7600–#7629) were configured in an A1A-A1A wheel arrangement, mounted atop a pair of three-axle trucks.

Externally, they boasted many of the same Raymond Loewy design influences found on the larger and more powerful FM H-16-66 model, some of which were built during the same period. None of the units are known to exist today.

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