Western Railway of Alabama 4-8-2 "Mountain" Locomotives of the USA

The Western Railway of Alabama purchased two 4-8-2s from the American Locomotive Company in 1920 to pull its passenger trains. The "Mountains" were given road numbers 180 and 181 and they had 27 x 28 cylinders, 69" drivers, a boiler pressure of 210 psi, a tractive effort 52,920 and each weighed 316,000 pounds.

Number 181 was scrapped in 1952 and 180 in 1954.

Class Details by Steve Llanso of Sweat House Media

Class M (Locobase 3104)

Data from A&WP - WRA 10 - 1945 Locomotive and Crane Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Unlike most of the other classes on the West Point Route, these Mountains went to only one of the two constituents; the Atlanta & West Point did not buy 4-8-2s. They were relatively light and small, but did the job. In World War II, they were sent to the Georgia Railroad (which connected Augusta with Atlanta and was a part of the WPR as well).

These two lasted in Western service until 1952 and 1954.

Specifications by Steve Llanso of Sweat House Media
Locobase ID3104
RailroadWestern Railway of Alabama (WPR)
Number in Class2
Road Numbers180-181
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase18'
Engine Wheelbase38.92'
Ratio of driving wheelbase to overall engine wheebase 0.46
Overall Wheelbase (engine & tender)73.94'
Axle Loading (Maximum Weight per Axle)52500 lbs
Weight on Drivers209500 lbs
Engine Weight314000 lbs
Tender Light Weight198700 lbs
Total Engine and Tender Weight512700 lbs
Tender Water Capacity11000 gals
Tender Fuel Capacity (oil/coal)15 tons
Minimum weight of rail (calculated)87 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"
Boiler Pressure190 psi
Cylinders (dia x stroke)27" x 28"
Tractive Effort47776 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.39
Heating Ability
Firebox Area280 sq. ft
Grate Area66.70 sq. ft
Evaporative Heating Surface3662 sq. ft
Superheating Surface817 sq. ft
Combined Heating Surface4479 sq. ft
Evaporative Heating Surface/Cylinder Volume197.36
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12673
Same as above plus superheater percentage14954
Same as above but substitute firebox area for grate area62776
Power L114620
Power MT615.40


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