TheFM H-12-46 was a lightroad switcher ofFairbanks-Morse design manufactured exclusively by theCanadian Locomotive Company from October, 1951–January, 1953 for theCanadian National Railway. Only thirty of the 1,200 hp, six-cylinderopposed piston enginelocomotives were produced. The units (assigned #7600–#7629) were configured in anA1A-A1A wheel arrangement, mounted atop a pair of three-axletrucks.

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

• "Fairbanks-Morse 38D8 Diesel Engine".PSRM Diesel Locomotives. Archived fromthe original on May 26, 2006. RetrievedJanuary 1, 2006.
• Pinkepank, Jerry A. (1973).The Second Diesel Spotter's Guide. Milwaukee, Wisconsin:Kalmbach Publishing.ISBN 978-0-89024-026-7.
• Kirkland, John F. (November 1985).The Diesel Builders Volume 1: Fairbanks-Morse and Lima-Hamilton. Interurban Press.ISBN 0-916374-69-6.

• Fairbanks-Morse H12-44, H12-44TS & H12-46 Roster

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