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 ID10,770
RailroadButte, Anaconda & Pacific
Number in Class1
Road Numbers20
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)13.67
Engine Wheelbase (ft)25.25
Ratio of driving wheelbase to overall engine wheebase 0.54
Overall Wheelbase (engine & tender) (ft)54.25
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)118,425
Engine Weight (lbs)152,180
Tender Loaded Weight (lbs)100,000
Total Engine and Tender Weight (lbs)252,180
Tender Water Capacity (gals)5000
Tender Fuel Capacity (oil/coal) (gals/tons)10
Minimum weight of rail (calculated) (lb/yd)66
Geometry Relating to Tractive Effort
Driver Diameter (in)67
Boiler Pressure (psi)200
High Pressure Cylinders (dia x stroke) (in)19" x 26"
Tractive Effort (lbs)23,815
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.97
Heating Ability
Firebox Area (sq ft)174.50
Grate Area (sq ft)34
Evaporative Heating Surface (sq ft)2420
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)2420
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 area34,900
Power L18618
Power MT481.30

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