Colonel Howard G Hill was a "draftee" from the Southern Pacific who was given the task in November 1941. According to Kent Rail:"Hill worked long and hard to pencil a locomotive from scratch, and in under a week produced a complete set of drawings ...In 1945 ...Howard G. Hill was awarded the ‘Legion of Merit' in recognition of his services to the US Military."
Among other features in these powerful little tanks were 8" piston valves.
According to the MRS booklet, the locomotives were supplied by 3 US builders - Davenport-Besler, HK Porter Co, and Vulcan Iron Works. US number series were 1252-1436, 1927-2031, 4006-4041, and 5000-5026. Also, it notes that after the first 50 locomotives the 66"-long grate was narrowed from 44" to 40", dropping the grate area from 19.4 sq ft to 18.3 sq ft.
Like other US Army locomotives, their postwar use ranged throughout the world, including 20 in Greece and 2 (converted to tender-pulling 0-6-0 engines) in Mexico.
The Project 62 renovation website, which documents the rehabilitation of a USATC 0-6-0T from Yugoslavia's Class 62 -- http://www.project62.supanet.com/fourproducers.htm, accessed 26 May 2006 -- notes that in addition to the 106 locomotives originally supplied by US manufacturers (62.001-62.106), a further 90 were delivered from the Djuro Djakovic works at Slavonski Brod in Croatia between 1951 and 1961. (Another 14 S100 apparently were consumed as spare parts.) The Yugoslavian loks used a plate frame rather than the original bar frame.
Also found on the Project 62 website is an interesting comment on the design's ride -- http://www.project62.supanet.com/USAlocohistory.htm (visited 1 June 2005): In comparing the USATC design to that of another widely distributed postwar design -- the Polish Tkh 49 Ferrum, the Project 62 historian comments: "The crank drive [of the Ferrum] is to the centre wheel (On Class 62's the connecting rod drives the crank on the rear wheel). This shorter drive connection and therefore increased angular oscillation of the crankshaft gives an inferior ride quality with noticeable "waddle" which is virtually absent in the Class 62's with their rear wheel crank position."
|Specifications by Steve Llanso|
|Class||S100 - African Theatre|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||1|
|Overall Wheelbase (engine & tender)||10'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||100650 lbs|
|Engine Weight||100650 lbs|
|Tender Light Weight|
|Total Engine and Tender Weight||100650 lbs|
|Tender Water Capacity||1200 gals|
|Tender Fuel Capacity (oil/coal)||1.3 tons|
|Minimum weight of rail (calculated) on which locomotive could run||56 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||211 psi|
|Cylinders (dia x stroke)||16.5" x 24"|
|Tractive Effort||21701 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.64|
|Firebox Area||86 sq. ft|
|Grate Area||19.40 sq. ft|
|Evaporative Heating Surface||876 sq. ft|
|Combined Heating Surface||876 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||147.49|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||4093|
|Same as above plus superheater percentage||4093|
|Same as above but substitute firebox area for grate area||18146|