US Army 0-6-0 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 030-TU (Locobase 15728)

Data from diagram of 030-TU published at the Les Trains de l'Histoire L'histoire des trains en images website and accessed through Google Images on 19 January 2014.

Class S100 - African Theatre (Locobase 1297)

Data from (July 2002), a web site by Nick Sbarounis specializing in Greek steam locomotives. Data added and confirmed by US Military Railway Service diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection and Kent Rail's extensive history at, last accessed 18 October 2011.

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 æLegion of MeritÆ 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 --, 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 -- (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 of Sweat House Media
Class030-TUS100 - African Theatre
Locobase ID15,728 1297
RailroadUS ArmyUS Army
Number in Class77353
Road Numbers
Number Built77353
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)1010
Engine Wheelbase (ft)1010
Ratio of driving wheelbase to overall engine wheebase11
Overall Wheelbase (engine & tender) (ft)1010
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)100,650100,650
Engine Weight (lbs)100,650100,650
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)100,650100,650
Tender Water Capacity (gals)12001200
Tender Fuel Capacity (oil/coal) (gals/tons) 1.30 1.30
Minimum weight of rail (calculated) (lb/yd)5656
Geometry Relating to Tractive Effort
Driver Diameter (in)5454
Boiler Pressure (psi)211211
High Pressure Cylinders (dia x stroke) (in)16.5" x 24"16.5" x 24"
Tractive Effort (lbs)21,70121,701
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.64 4.64
Heating Ability
Firebox Area (sq ft)8686
Grate Area (sq ft)19.4019.40
Evaporative Heating Surface (sq ft)876876
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)876876
Evaporative Heating Surface/Cylinder Volume147.49147.49
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation40934093
Same as above plus superheater percentage40934093
Same as above but substitute firebox area for grate area18,14618,146
Power L141764176
Power MT274.41274.41


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