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 1200 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.
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