Atlanta, Birmingham & Atlantic 2-10-2 "Santafe" Locomotives in the USA

In 1917, the Atlanta, Birmingham & Coast Railroad took delivery of three "Santa Fe" type locomotives from the Baldwin Locomotive Works. These 2-10-2 locomotives had 58" diameter drivers, 27" x 30" cylinders, a 188.5 psi boiler pressure, they exerted 60,416 pounds of tractive effort and each 316,000 pounds. In 1946, the Atlantic Coast Line acquired the AB&C and the three "Santa Fe" locomotives were conveyed to the ACL and became ACL numbers 7401 through 7403. The ACL increased the diameter of the drivers to 63" which allowed gave them greater flexibility for their use. There are no surviving AB&C 2-10-2 "Santa Fe" type locomotives.


Qty.Road NumbersYear BuiltBuilderNotes
3401-4031917BaldwinConveyed to the Atlantic Coast Line on 1/1/1946 and became ACL numbers 7401-7403. Numbers 7401-7403 scrapped in 1951-1952.

Class Details by Steve Llanso of Sweat House Media

Class F-1 (Locobase 7862)

Data from AB&C 11-1930 & 1-1943 Locomotive Diagrams and Passenger Car Data book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 55, pp. 55+. (Thanks to Chris Hohl for his 9 May 2015 email noting several differences among sources that led both to corrections and expansions and for providing the correct tender water capacity.) Works numbers were 45708-45710 in June 1917.

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. (For a full description of the Gaines combustion chamber's intended effect on combustion, see Locobase 4228.)

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.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID7862
RailroadAtlanta, Birmingham & Atlantic (AB&C)
Number in Class3
Road Numbers401-403 / 7401-7403
Number Built3
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase (ft / m)21.08 / 6.43
Engine Wheelbase (ft / m)38 / 11.58
Ratio of driving wheelbase to overall engine wheebase 0.55
Overall Wheelbase (engine & tender) (ft / m)71.58 / 21.82
Axle Loading (Maximum Weight per Axle) (lbs / kg)50,000 / 22,680
Weight on Drivers (lbs / kg)250,000 / 113,398
Engine Weight (lbs / kg)316,000 / 143,335
Tender Loaded Weight (lbs / kg)168,000 / 76,204
Total Engine and Tender Weight (lbs / kg)484,000 / 219,539
Tender Water Capacity (gals / ML)8500 / 30.30
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)15 / 13.60
Minimum weight of rail (calculated) (lb/yd / kg/m)83 / 41.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1473
Boiler Pressure (psi / kPa)185 / 13
High Pressure Cylinders (dia x stroke) (in / mm)27" x 30" / 686x762
Tractive Effort (lbs / kg)60,334 / 27367.07
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.14
Heating Ability
Firebox Area (sq ft / m2)410 / 38.10
Grate Area (sq ft / m2)70 / 6.51
Evaporative Heating Surface (sq ft / m2)4472 / 415.61
Superheating Surface (sq ft / m2)1175 / 109.20
Combined Heating Surface (sq ft / m2)5647 / 524.81
Evaporative Heating Surface/Cylinder Volume224.95
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12,950
Same as above plus superheater percentage15,670
Same as above but substitute firebox area for grate area91,779
Power L115,114
Power MT666.41

  • 401 (Harold K. Vollrath Collection)
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