|Qty.||Road Numbers||Year Built||Builder||Notes|
|3||401-403||1917||Baldwin||Conveyed to the Atlantic Coast Line on 1/1/1946 and became ACL numbers 7401-7403. Numbers 7401-7403 scrapped in 1951-1952.|
These was a modest-sized Santa Fe trio, quite a bit smaller than the Atlantic Coast Line engines they'd later join under the ACL banner. Their 13" (331 mm) piston valves were also smaller. Firebox heating surface area included 38 sq ft (5.53 sq m) in four arch tubes. The Gaines combustion chamber didn't merit a quantity in the Baldwin specs in 1916, but later diagrams suggest that the firebox heating surface's 410 sq ft included 96 sq ft (8.92 sq m) in the combustion chamber.
Before long, thicker tires raised driver diameter to 58" (1,473 mm). Nine years after their arrival, the AB&C added Elesco K-31 feed water heaters to 401 and 402, installed discs on the main drivers in 1937-1939 (401, 402, 403). Only in 1940 did the railroad install automatic stokers in 401-402.
After the acquisition, the ACL increased the driver diameter to 63", which the frame's long wheelbase easily accommodated. Although tractive effort was reduced as a result, the class now possessed greater operational flexibility. The ACL's 1946 book also showed a bigger tender holding 15,680 US gallons (59,349 litres) of water and 17 tons(15.45 mt) of goal. Tender empty weight now came to 113,900 lb (51,664 kg).
The power system now weighed 601,950 lb (273,040 kg) comprising a loaded engine weight reaching 323,900 lb (146,919 kg)--of which adhesion weight now came to 259,500 lb (117,707 kg)--and a loaded tender weighing 278,050 lb (126,122 kg). Total wheelbase climbed to 86 ft 4 in (26.31 m) and overall lengthreached 96 ft 9 1/2 in (29.5 m).
They remained in service until 1951-1952.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Atlanta, Birmingham & Atlantic (AB&C)|
|Number in Class||3|
|Road Numbers||401-403 / 7401-7403|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||21.08|
|Engine Wheelbase (ft)||38|
|Ratio of driving wheelbase to overall engine wheebase||0.55|
|Overall Wheelbase (engine & tender) (ft)||71.58|
|Axle Loading (Maximum Weight per Axle) (lbs)||50,000|
|Weight on Drivers (lbs)||250,000|
|Engine Weight (lbs)||316,000|
|Tender Loaded Weight (lbs)||168,000|
|Total Engine and Tender Weight (lbs)||484,000|
|Tender Water Capacity (gals)||8500|
|Tender Fuel Capacity (oil/coal) (gals/tons)||15|
|Minimum weight of rail (calculated) (lb/yd)||83|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||57|
|Boiler Pressure (psi)||185|
|High Pressure Cylinders (dia x stroke) (in)||27" x 30"|
|Tractive Effort (lbs)||60,334|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.14|
|Firebox Area (sq ft)||410|
|Grate Area (sq ft)||70|
|Evaporative Heating Surface (sq ft)||4472|
|Superheating Surface (sq ft)||1175|
|Combined Heating Surface (sq ft)||5647|
|Evaporative Heating Surface/Cylinder Volume||224.95|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||12,950|
|Same as above plus superheater percentage||15,670|
|Same as above but substitute firebox area for grate area||91,779|