Canadian National Railway FM H-12-46 No. 1616 built in 1951-53 by Canadian Locomotive Co.

(Internet photo, Fair use, Title 17, Section 107.


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FM H-12-46

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 No. 7600–No. 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.


FM H-12-46 Overview

Type and origin
Power type: Diesel
Builder: Fairbanks-Morse
Model: H-12-46
Build date: October 1951 — January 1953
Total produced: 30
​• AAR A1A-A1A
Gauge: 4 ft 8+1⁄2 in (1,435 mm)
Prime mover: FM 38D-8 1/8
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
Locomotive brake: Straight air
Train brakes: Air
Performance figures
Maximum speed: 60 mph (97 km/h)
Power output: 1,200 hp (895 kW)
Locale: North America