FM H-10-44

{{more footnotes needed|date=June 2017}}

{{Infobox locomotive

| name=FM H-10-44

| powertype=Diesel-electric

| gauge={{RailGauge|ussg}}

| image=Milw 760 at IRM.jpg

| caption=Milwaukee Road 760, an H-10-44 and the first FM locomotive, preserved in operating condition at Illinois Railway Museum.

| builder=Fairbanks-Morse

| aarwheels=B-B

| uicclass=Bo'Bo'

| trucks =AAR type A

| wheeldiameter = {{convert|40|in|mm|0|abbr=on}}

| minimumcurve = 29.50 ({{convert|194|ft|m|2|abbr=on}} radius)

| wheelbase = {{convert|33|ft|6|in|m|2|abbr=on}}

| cylindercount=6 (Opposed piston)

| primemover=FM 38D-8 1/8

| builddate=August 1944–March 1950

| totalproduction=195

| locale=North America

| poweroutput={{convert|1000|hp|kW|0|abbr=on|lk=in}}

| maxspeed={{convert|60|mph|km/h|0|abbr=on}}

| locoweight={{convert|240000|lb|t|1|abbr=on}}

| tractiveeffort={{convert|40440|lbf|kN|1|abbr=on}}

| length={{convert|48|ft|10|in|m|2|abbr=on}}

| width = {{convert|10|ft|2|in|m|2|abbr=on}}

| height = {{convert|14|ft|6|in|m|2|abbr=on}}

| enginetype=Two-stroke diesel

| aspiration=Roots blower

| cylindersize={{convert|8.125|x|10|in|mm|0|abbr=on}}

| displacement={{convert|6222|cuin|L|abbr=on}}

| generator = Westhse 481-A

| tractionmotors = (4) Westhse 362-D

| transmission=

| locobrakes=Straight air

| trainbrakes=Air

| buildmodel=H-10-44

| disposition=Three preserved, remainder scrapped, 1 replica on display

}}

The FM H-10-44 was a switcher locomotive produced by Fairbanks-Morse from August, 1944–March, 1950. The units featured a {{convert|1000|hp|adj=on}}, six-cylinder opposed piston prime mover, and were configured in a B-B wheel arrangement mounted atop a pair of two-axle AAR Type A trucks, with all axles powered. Many H-10-44s received modifications that increased their horsepower rating to {{convert|1200|hp|abbr=on}}.

The Raymond Loewy-designed carbody featured a slanted nose, sloping hood lines, and (considered to be its most distinguishing feature) a protruding roof visor mounted on the rear of the cab. These styling cues were carried through to the H-10-44's successor, the FM H-12-44, until September 1952 when the exterior design was "Spartanized" to reduce production costs.

A total of 195 units were built for American railroads. Three intact examples of the H-10-44 are known to survive today, all of which are owned by railroad museums. Most notable of these is Milwaukee Road #760 (originally delivered as #1802), the first Fairbanks–Morse locomotive constructed in their own plant, which is preserved and operational at the Illinois Railway Museum. Another example is former Hallet Dock Company HD-11, which is now at the Lake Superior Railroad Museum in Duluth, Minnesota.

In 1954, Milwaukee Road H-10-44 #1811 (Now 781) and Milwaukee Road “ribside” caboose #01900 wrecked between Monticello and New Glarus, Wisconsin. A wooden rail bridge had been previously burned in a grass fire, and both the locomotive and caboose struck the bridge. Both are now restored and on display at the Brodhead Historical Society in Brodhead, Wisconsin.

A reproduction H-10-44 locomotive sits atop the Wood Family Fishing Bridge, a former railroad bridge which crosses the Rock River several hundred yards south of the foundry where the H-10-44s were built, in Beloit, Wisconsin.