Ann Arbor 2-10-2 "Santafe" Locomotives of the USA

In 1919, the Ann Arbor Railroad received four USRA allocated "Santa Fe" Light locomotives. They were built by the Baldwin Locomotive Works and were designated as Class L and assigned road numbers 190-193. These locomotives had 57" diameter drivers, 27" x 32" cylinders, a 200 psi boiler pressure, they exerted 69,575 pounds of tractive effort and each weighed 352,000 pounds.

The Ann Arbor came under the control of the Wabash Railroad in 1926. The Ann Arbor identity was preserved, but the locomotive classes and numbers were changed to conform to those of the Wabash. Class L locomotives numbers 190-193 were reclassified as Class L-2 with road numbers 2550-2553 assigned.

Although these "Santa Fe" type locomotives were well proportioned for their cylinder volume their low drivers made them best suited for drag freight service which dwindled during the late 1920s and 1930's. When WWII began, all of the United States railroads needed more motive power. The Ann Arbor Railroad sold all four of the Class L (Wabash Class L-2) 2-10-2s to the Kansas City Southern in 1942. The KCS assigned them their road numbers 220 through 223.

There are no surviving AA 2-10-2 "Santa Fe" type locomotives.

Roster by Richard Duley

ClassQty.Road NumbersWabash NumbersYear BuiltBuilderNotes
L 4190-1932550-25531919Baldwin1. USRA allocated "Santa Fe-Light" locomotives. After the Wabash took control of the AA these locomotives became Wabash Class L-2 with numbers 2550-2553. Numbers 2550-2553 were sold to the KCS in 1942 and became KCS road numbers 220-223.

Class Details by Steve Llanso of Sweat House Media

Class L (Locobase 8393)

Data from AA-M&LS 1 - 1928 locomotive diagram book dated supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 52248 in August 1919and 52279-52281 in September.

Ann Arbor's Santa Fes were four examples of the light Santa Fe design delivered to several railroads through the United States Railroad Administration. Although generously proportioned for their cylinder volume, the light Santa Fe's low drivers doomed them to drag-freight service that dwindled during the 1920s and 1930s.

When World War II began for the United States and railroads across the country were scrambling for any motive power they could get, the AA sold this quartet to the Kansas City Southern in September 1942.

Specifications by Steve Llanso of Sweat House Media
Locobase ID8393
RailroadAnn Arbor (AA)
Number in Class4
Road Numbers190-193
Number Built4
Valve GearSouthern
Locomotive Length and Weight
Driver Wheelbase21'
Engine Wheelbase40.33'
Ratio of driving wheelbase to overall engine wheebase 0.52
Overall Wheelbase (engine & tender)75.96'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers276000 lbs
Engine Weight352000 lbs
Tender Light Weight188300 lbs
Total Engine and Tender Weight540300 lbs
Tender Water Capacity10000 gals
Tender Fuel Capacity (oil/coal)16 tons
Minimum weight of rail (calculated)92 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"
Boiler Pressure200 psi
Cylinders (dia x stroke)27" x 32"
Tractive Effort69575 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.97
Heating Ability
Firebox Area379 sq. ft
Grate Area76.30 sq. ft
Evaporative Heating Surface4699 sq. ft
Superheating Surface1078 sq. ft
Combined Heating Surface5777 sq. ft
Evaporative Heating Surface/Cylinder Volume221.59
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15260
Same as above plus superheater percentage18159
Same as above but substitute firebox area for grate area90202
Power L114601
Power MT583.15



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