Macon, Dublin & Savannah 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 100 (Locobase 12573)

Data from Volume 45, p.152. Works number was 33517 in June 1909.

Although the MD&S did not actually merge with the Seaboard Air Line until 1958, it was such a small line that it bought very few locomotives new. Still, it acquired this little Eight-wheeler from the builder itself.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,573
RailroadMacon, Dublin & Savannah
Number in Class1
Road Numbers100 / 98
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 9.08
Engine Wheelbase (ft)24.29
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)73,000
Engine Weight (lbs)116,000
Tender Loaded Weight (lbs)70,000
Total Engine and Tender Weight (lbs)186,000
Tender Water Capacity (gals)3500
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)61
Geometry Relating to Tractive Effort
Driver Diameter (in)62
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)18" x 24"
Tractive Effort (lbs)19,189
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.80
Heating Ability
Firebox Area (sq ft)152.70
Grate Area (sq ft)18.60
Evaporative Heating Surface (sq ft)1690
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1690
Evaporative Heating Surface/Cylinder Volume239.09
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3348
Same as above plus superheater percentage3348
Same as above but substitute firebox area for grate area27,486
Power L16456
Power MT389.95

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