Alaska Railroad 4-8-2 "Mountain" Type Locomotives

Class 801 (Locobase 5094)

Firebox had 3 thermic syphons (84 sq ft) and a combustion chamber (64 sq ft), which together contributed 148 sq ft to the firebox heating surface. Small Mountain for this northernmost American railroad. Indeed, it is one of only 3 North American standard gauge 4-8-2s in Locobase with an adhesion weight under 200,000 lb. (The others are the 1914 Canadian Pacific I1 class found in Locobase 4258 and the New Orleans Great Northern 200 at Locobase 6909)

Built in Philadelphia, the engines were taken apart and shipped up to Anchorage, where they were reassembled in the shops. 801 (works #61736) was completed in 1932. It was wrecked twice, once in 1942 and once in 1950.

802 (works #64366) entered service on 5 December 1942 and ran until dieselization led to its retirement and scrapping in April 1954.

See account in http://www.alaskarails.org/pix/former-loco/802/html (visited December 2002)

Specifications
Class801
Locobase ID5094
RailroadAlaska Railroad
Whyte4-8-2
Road Numbers801-802
GaugeStd
BuilderBaldwin
Year1932
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase16.50'
Engine Wheelbase38.50'
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender)73.29'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers190850 lbs
Engine Weight273300 lbs
Tender Light Weight200300 lbs
Total Engine and Tender Weight473600 lbs
Tender Water Capacity10000 gals
Tender Fuel Capacity (oil/coal)14 tons
Minimum weight per yard of rail on which locomotive could run79.52 lb rail
Geometry Relating to Tractive Effort
Driver Diameter63"
Boiler Pressure220 psi
Cylinders (dia x stroke)22" x 30"
Tractive Effort43099 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.43
Heating Ability
Firebox Area416 sq. ft
Grate Area62.50 sq. ft
Evaporative Heating Surface2870
Superheating Surface706
Combined Heating Surface3576
Evaporative Heating Surface/Cylinder Volume217.44
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13750
Same as above plus superheater percentage16464.63
Same as above but substitute firebox area for grate area109588.55
Power L119783.42
Power MT914.12

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.

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