Georgia Marble 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 13082)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 30, p. 183. See also "The Most Wonderful Marble Deposits in the World," The World's Work, Volume 14, No. 6 (June 1907), pp. 9046 (part of a "Southern Number" profiling all parts of the South). Works number was 29910 in January 1907.

The quarries exploited by this large company had their center in Tate, Pickens County some 61 miles north of Atlanta. When GM ordered this Mogul, they laid out the difficult terrain over which it would have to operate: "Eng[ine] to handle easily 180 gross tons on 14 degree curve and 4 1/2% grade."

The World's Work article described the railway operations of this mammoth enterprise: "Many miles of standard gauge track connect the different quarries of the Georgia Marble Company with each other and with the main line of the Louisville & Nashville railroad system. All through the busy day, locomotives, from small switch engines to big 'battleships,' draw the many heavily loaded cars and start these shipments of Georgia marble on to their distant destinations. Some idea of the power of these locomotives may be gained from the fact that they have to move cars loaded with blocks of stone that run as high as twenty-seven tons to the block. Only the most massive of modern machinery makes possible the handling of these huge blocks of marble. In fact, everything on and about this great plant is on such a colossal scale that the casual spectator not only appreciates his own littleness but soon loses all sense of proportions.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID13,082
RailroadGeorgia Marble
Number in Class1
Road Numbers4
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.17 / 3.40
Engine Wheelbase (ft / m)19.33 / 5.89
Ratio of driving wheelbase to overall engine wheebase 0.58
Overall Wheelbase (engine & tender) (ft / m)48.33 / 14.73
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)130,000 / 58,967
Engine Weight (lbs / kg)145,000 / 65,771
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)205,000 / 92,987
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)72 / 36
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)20" x 26" / 508x660
Tractive Effort (lbs / kg)32,933 / 14938.18
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.95
Heating Ability
Firebox Area (sq ft / m2)170 / 15.80
Grate Area (sq ft / m2)24.70 / 2.30
Evaporative Heating Surface (sq ft / m2)1824 / 169.52
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1824 / 169.52
Evaporative Heating Surface/Cylinder Volume192.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4693
Same as above plus superheater percentage4693
Same as above but substitute firebox area for grate area32,300
Power L14568
Power MT232.40

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Wes Barris