United States Government-Army Engineers 2-6-0 "Mogul" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 15280)

Data from DeGolyer, Vol 72, pp. 243+. Works number was 57789 in June 1924..

This oil-burning Mogul performed switching and light freight service at Hawaii's Fort Weaver. Its narrow-gauge road used 60 lb/yard (30 kg/metre) rail laid on crossties spaced 2 feet (610 mm) apart. Maximum grades reached 3% and the tightest curves were measured at 17 degrees (radius of 338 feet/103 metres). The specs also mention 1.67% grades combined with 12 degree (478 feet/146 metres).

The engine's tender had a sloped back for better visibility when backing up.

Specifications by Steve Llanso of Sweat House Media
Locobase ID15,280
RailroadUnited States Government-Army Engineers
Number in Class1
Road Numbers
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.44
Engine Wheelbase (ft / m)16.33 / 4.98
Ratio of driving wheelbase to overall engine wheebase 0.49
Overall Wheelbase (engine & tender) (ft / m)44.98 / 13.71
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)70,800 / 32,114
Engine Weight (lbs / kg)80,000 / 36,287
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)140,000 / 63,503
Tender Water Capacity (gals / ML)2500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1500 / 5.70
Minimum weight of rail (calculated) (lb/yd / kg/m)39 / 19.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43 / 1092
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x508
Tractive Effort (lbs / kg)18,218 / 8263.56
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.89
Heating Ability
Firebox Area (sq ft / m2)69 / 6.41
Grate Area (sq ft / m2)16.90 / 1.57
Evaporative Heating Surface (sq ft / m2)1104 / 102.56
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1104 / 102.56
Evaporative Heating Surface/Cylinder Volume237.20
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3042
Same as above plus superheater percentage3042
Same as above but substitute firebox area for grate area12,420
Power L14016
Power MT375.16