The FM H-15-44 was a diesel locomotive manufactured by Fairbanks-Morse from September 1947 to June 1950. The locomotive was powered by a 1,500-horsepower (1,100 kW), eight-cylinder opposed piston engine as its prime mover, and was configured in a B-B wheel arrangement mounted atop a pair of two-axle AAR Type-B road trucks with all axles powered. The H-15-44 featured an offset cab design that provided space for an optional steam generator in the short hood, making the model versatile enough to work in passenger service as well as freight duty.

FM H-15-44
Denver and Rio Grande Western Railroad #151, an FM H-15-44 road-switcher, leads a westbound freight train out of Denver, Colorado in July 1952. One of the first units produced, it displays the Loewy design cues that were a signature feature of many early Fairbanks-Morse locomotives.
Type and origin Power type Diesel-electric Builder Fairbanks-Morse Model H-15-44 Build date September 1947–June 1950 Total produced 35
Specifications Configuration: ​  • AAR B-B Gauge 4 ft 8+1⁄2 in (1,435 mm) Length 51 ft 0 in (15.54 m) Loco weight 250,000 lb (113.4 t) Prime mover FM 38D-8 1/8 Engine type Two-stroke diesel Aspiration Roots blower Displacement 8,295 cu in (135.93 dm3) Cylinders 8 (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 65 mph (105 km/h) Power output 1,500 hp (1.12 MW) Tractive effort 42,125 lbf (187.4 kN)
Career Locale North America Disposition All scrapped

Raymond Loewy heavily influenced the look of the unit, which emphasized sloping lines and accented such features as the radiator shutters and headlight mounting, as is found on CNJR #1501 and KCS #40. The cab-side window assembly incorporated "half moon"-shaped inoperable panes which resulted in an overall oblong shape. The platform (underframe) was shared with F-M's 2,000-horsepower (1,500 kW) end cab road switcher, the FM H-20-44, as was the carbody to some extent. The platform and carbody was also utilized by the H-15-44's successor, the FM H-16-44.

Only 35 units were built for American railroads and none exist today.