Western Railway of Alabama 4-8-2 "Mountain" Locomotives in 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 Rail Data Exchange.

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.

Principal Dimensions 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 Wheelbase (ft / m)18 / 5.49
Engine Wheelbase (ft / m)38.92 / 11.86
Ratio of driving wheelbase to overall engine wheebase 0.46
Overall Wheelbase (engine & tender) (ft / m)73.94 / 22.54
Axle Loading (Maximum Weight per Axle) (lbs / kg)52,500 / 23,814
Weight on Drivers (lbs / kg)209,500 / 95,028
Engine Weight (lbs / kg)314,000 / 142,428
Tender Loaded Weight (lbs / kg)198,700 / 90,129
Total Engine and Tender Weight (lbs / kg)512,700 / 232,557
Tender Water Capacity (gals / ML)11,000 / 41.67
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)15 / 13.60
Minimum weight of rail (calculated) (lb/yd / kg/m)87 / 43.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)69 / 1753
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)27" x 28" / 686x711
Tractive Effort (lbs / kg)47,776 / 21670.85
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.39
Heating Ability
Firebox Area (sq ft / m2)280 / 26.02
Grate Area (sq ft / m2)66.70 / 6.20
Evaporative Heating Surface (sq ft / m2)3662 / 340.33
Superheating Surface (sq ft / m2)817 / 75.93
Combined Heating Surface (sq ft / m2)4479 / 416.26
Evaporative Heating Surface/Cylinder Volume197.36
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12,673
Same as above plus superheater percentage14,954
Same as above but substitute firebox area for grate area62,776
Power L114,620
Power MT615.40

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