FM H-12-44TS Diesel-Electric Locomotive
The FM H-12-44TS was a light road switcher version of the Fairbanks-Morse H-12-44 yard switcher. Only three of the 1,200-horsepower (890 kW), six-cylinder opposed piston engine locomotives (builder numbers 12L1021–12L1023) were manufactured especially for the Atchison, Topeka and Santa Fe Railway in May, 1956. The units had an extended frame to accommodate the addition of a short hood behind the cab, and were configured in a B-B wheel arrangement and mounted atop a pair of two-axle AAR Type-A switcher trucks with all axles powered. H-12-44TSs also came equipped with steam generator units as they were acquired solely for shuttling passenger cars in and around the Dearborn Station terminal in Chicago, Illinois.

The locomotives (No. 541, No. 542, No. 543) were delivered in the road's Zebra Stripe paint scheme, though all three would finish out their days on the Santa Fe dressed in the switcher version of the blue and yellow Billboard livery. Coinciding with the end of Santa Fe passenger train service in Chicago, No. 541 was retired on June 1, 1972 and sold to the Allison Steel Manufacturing Company in October of that year; No. 542 and No. 543 were both retired on May 7, 1974, though #543 (the only example to have evaded the scrap yard) was subsequently preserved in Albuquerque, New Mexico and donated to the California State Railroad Museum in March 1986. It has since been moved to the Illinois Railway Museum.

FM H-12-44TS Overview
Type and origin
Power type: Diesel-electric
Builder: Fairbanks-Morse
Serial numbers: 12L1021–12L1023
Model: H-12-44TS
Build date: May 1956
Total produced: 3
​ • AAR B-B
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Prime mover: FM 38D-8 1/8
Engine type: Opposed piston Two-stroke diesel
Aspiration: Roots blower
Displacement: 6,222 cu in (101.96 L)
Generator: DC
Traction motors: 4 DC
Cylinders: 6
Cylinder size: 8.125 in × 10 in (206 mm × 254 mm)
Transmission: Diesel-electric
Locomotive brake: Straight air
Train brakes: Air
Performance figures
Maximum speed: 60 mph (97 km/h))
Power output: 1,200 hp (895 kW)
Operator: Atchison, Topeka and Santa Fe Railway
Numbers: 541–543
Locale: North America
Retired: 1972–1974
Disposition: One preserved, two scrapped

See also:

FM H-12-44


F-M Diesel-Electric Locomotives

Diesel-Electric Locomotives


Illinois Railway Museum

AT&SF FM H-12-44 No. 543 at the Illinois Railway Museum.

F-M H-44-12TS No. 542.

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F-M H-44-12TS No. 542.
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