United States Army 4039, Steam switcher locomotive at Whippany Railway Museum, New Jersey, United States.
The United States Army 4039 is a 0-6-0 steam switcher locomotive built by the American Locomotive Company in November 1942, featuring two outside cylinders, 44-inch driver diameter, and 190 psi boiler pressure designed for military yard operations.
Originally manufactured for U.S. Army service during World War II, this locomotive was part of the USATC S155 class intended for military theaters but primarily operated on domestic military bases performing essential switching tasks until 1947.
Listed on the National Register of Historic Places in 2002, this locomotive represents the critical role of steam-powered rail equipment in supporting American military logistics and wartime transportation infrastructure during the 1940s.
Located at 1 Railroad Plaza in Hanover Township, New Jersey, visitors can view the locomotive at the Whippany Railway Museum, which offers educational programs and guided tours explaining its specifications and operational history.
This locomotive underwent conversion from coal to oil firing during its preservation period and completed its final operational run in December 1980 between Newfoundland and Stockholm, New Jersey, before becoming a static museum display.
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