Butte, Anaconda & Pacific 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 20 (Locobase 10770)

Data from Baldwin Locomotive Works, Record of Recent Construction ((1903), No. 31, p. 15. Works number was 19389 in August 1901.

See Locobase 8833 for a brief description of the B A & P. As noted there, the B A & P electrified in 1915. At that time, 20 was sold to Cuba's Central Toluca Chucho.

Specifications by Steve Llanso of Sweat House Media
Locobase ID10770
RailroadButte, Anaconda & Pacific
Number in Class1
Road Numbers20
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase13.67'
Engine Wheelbase25.25'
Ratio of driving wheelbase to overall engine wheebase 0.54
Overall Wheelbase (engine & tender)54.25'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers118425 lbs
Engine Weight152180 lbs
Tender Light Weight100000 lbs
Total Engine and Tender Weight252180 lbs
Tender Water Capacity5000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated)66 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter67"
Boiler Pressure200 psi
Cylinders (dia x stroke)19" x 26"
Tractive Effort23815 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.97
Heating Ability
Firebox Area174.50 sq. ft
Grate Area34 sq. ft
Evaporative Heating Surface2420 sq. ft
Superheating Surface
Combined Heating Surface2420 sq. ft
Evaporative Heating Surface/Cylinder Volume283.63
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6800
Same as above plus superheater percentage6800
Same as above but substitute firebox area for grate area34900
Power L18618
Power MT481.30

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