FM H-20-44

FM H-20-44
An FM H-20-44 road switcher, retired Union Pacific #1366, now at the Illinois Railway Museum.
Type and origin Power type Diesel-electric Builder Fairbanks-Morse Model H-20-44 Build date June 1947 — March 1954 Total produced 96
Specifications Configuration: ​  • AAR B-B  • UIC B′B′ Gauge 1,435 mm (4 ft 8 1⁄2 in) Length 51 ft 0 in (15.54 m) Loco weight 254,000 lb (115.2 tonnes) Prime mover FM 38D-10 Engine type Two-stroke diesel Aspiration Roots blower Displacement 10,369 cu in (169,920 cm3) Cylinders 10 (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 70 mph (113 km/h) Power output 2,000 hp (1.49 MW) Tractive effort 42,125 lbf (187.38 kN)
Career Locale North America Disposition Three preserved, remainder scrapped

The FM H-20-44 was a multiple unit-capable end cab road switcher manufactured by Fairbanks-Morse from June 1947 – March 1954, and represented the company's first foray into the road switcher market. The 2,000 hp (1,490 kW), ten-cylinder opposed piston engine locomotive was referred to by F-M's engineering department as the "Heavy Duty" unit. It was configured in a B-B wheel arrangement mounted atop a pair of two-axle AAR Type-B road trucks with all axles powered. H-20-44s shared the same platform and much of the same carbody as the lighter-duty FM H-15-44, which began its production run three months later.

In the same manner as other F-M switcher models, the H-20-44 started out displaying a variety of Raymond Loewy-inspired contours, only to have the majority of these superfluous trim features stripped from the last few units built as a cost-cutting measure. Only 96 units were built for American railroads, as few firms saw sufficient value in moving freight in greater quantities or at a higher speeds than was possible with the typical 1,500- and 1,600 horsepower (1,200 kW) four-axle road switchers of the era. Also limiting the model's utility as a true road unit was its lack of a short hood, which the (ironically) lighter-duty H-15-44 did have. Three intact examples of the H-20-44 are known to survive today; all are the property of railroad museums.