Other than those of the Great Northern (Locobases 352 and 13536), Baldwin managed to sell only three more of this unequal wheel arrangement to two other railroads. Two went to the Southern while this lone engine was delivered to a Georgia subsidiary.
The specifications called for the engine to haul 2,000 short tons up a straight 1% grade and 1,700 short tons up 1 1/4% straight grade, both loads at 8-10 mph (12-16 kph). Baldwin reported that the engine was operating over 1 1/4% grades and developing 72,700 lb (32,976 kg) of tractive effort. It used a "reheater" in the smokebox (638 sq ft/59.27 sq m) to dry the steam before admitting it to the low-pressure cylinders. All four cylinders were supplied through piston valves.
Comparing the original specs in the DeGolyer volume with the data presented in the Record of Recent Construction shows the original weight estimates were a bit high.
After about four years of what must have been unsatisfying operation, the engine went over to the Chicago, New Orleans & Texas in 1914 for three years and then to the Southern itself. The Southern ran it for another eighteen years before scrapping it in 1935.
Early Mallets with unequal wheel arrangement. Rigid wheelbases were 10 ft (front) and 15 ft (rear). The smokebox held a Baldwin reheater (638 sq ft/59.27 sq m) to dry the steam before admitting it to the low-pressure cylinders. The HP cylinders were supplied by 13" (331 mm) piston valves; LP cylinders used Richardson balanced slide valves.
Only three built for the Southern (2) and Alabama Great Southern (see Locobase 10990).
Boiler pressure later reduced and tractive effort dropped to 72,500 lb. Great Northern 2-6-8-0s were very similar.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Alabama Great Southern (SRS)||Southern (SRS)|
|Number in Class||1||2|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||15 / 4.57||34.42 / 10.49|
|Engine Wheelbase (ft / m)||43.33 / 13.21||43.33 / 13.21|
|Ratio of driving wheelbase to overall engine wheebase||0.35||0.79|
|Overall Wheelbase (engine & tender) (ft / m)||71.54 / 21.81||71.54 / 21.81|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||332,700 / 150,910||332,700 / 150,910|
|Engine Weight (lbs / kg)||363,550 / 164,904||363,500 / 164,881|
|Tender Loaded Weight (lbs / kg)||171,450 / 77,769||162,000 / 73,482|
|Total Engine and Tender Weight (lbs / kg)||535,000 / 242,673||525,500 / 238,363|
|Tender Water Capacity (gals / ML)||9000 / 34.09||9000 / 34.09|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||13 / 11.80||13 / 11.80|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||79 / 39.50||79 / 39.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||56 / 1422||56 / 1422|
|Boiler Pressure (psi / kPa)||200 / 13.80||200 / 13.80|
|High Pressure Cylinders (dia x stroke) (in / mm)||23" x 32" / 584x813||23" x 32" / 584x813|
|Low Pressure Cylinders (dia x stroke) (in / mm)||35" x 32" / 889x813||35" x 32" / 889x813|
|Tractive Effort (lbs / kg)||71,780 / 32558.90||71,780 / 32558.90|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.63||4.63|
|Firebox Area (sq ft / m2)||228 / 21.19||221 / 20.53|
|Grate Area (sq ft / m2)||78 / 7.25||78 / 7.25|
|Evaporative Heating Surface (sq ft / m2)||5611 / 521.47||5601 / 520.35|
|Superheating Surface (sq ft / m2)||638 / 59.29|
|Combined Heating Surface (sq ft / m2)||6249 / 580.76||5601 / 520.35|
|Evaporative Heating Surface/Cylinder Volume||364.64||363.99|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||15,600||15,600|
|Same as above plus superheater percentage||17,160||15,600|
|Same as above but substitute firebox area for grate area||50,160||44,200|