Data from Baldwin Locomotive Works, Record of Recent Construction ((1903), No. 31, p. 15. See also DeGolyer, Volume 24, p. 37; and "No. 54 Formal --Thomas O Miles vs. Butte, Anaconda & Pacific Railway Co." , First Annual Report of the Board of Railroad Commissioners of the State of Montana, Volume 1 (1907-1908) (Helena, Mont: State Publishing Company, 1908), p. 35. Works number was 19389 in August 1901.
This passenger Ten-wheeler was one of only three BA&P locomotives that rolled on drivers taller than 57". It hauled passenger trains over the 26 miles (42 km) between Anaconda & Butte, a route that included Miles Crossing, Mont. The citizens in and around that town submitted a plea to the Montana Board of Railroad Commissioners to mandate a flag stop on an additional eastbound train. The BA&P agreed in May 1908 to add the stop to the No. 6 train.
See Locobase 8833 for a brief description of the BA&P. As noted there, the BA&P electrified in 1915. At that time, 20 was sold to Cuba's Central Toluca Chucho.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 20 |
| Locobase ID | 10770 |
| Railroad | Butte, Anaconda & Pacific |
| Country | USA |
| Whyte | 4-6-0 |
| Number in Class | 1 |
| Road Numbers | 20 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1901 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.67 / 4.17 |
| Engine Wheelbase (ft / m) | 25.25 / 7.70 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.54 |
| Overall Wheelbase (engine & tender) (ft / m) | 54.25 / 16.54 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 118,425 / 53,717 |
| Engine Weight (lbs / kg) | 152,180 / 69,028 |
| Tender Loaded Weight (lbs / kg) | 100,000 / 45,359 |
| Total Engine and Tender Weight (lbs / kg) | 252,180 / 114,387 |
| Tender Water Capacity (gals / ML) | 5000 / 18.94 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 10 / 9 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 66 / 33 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 67 / 1702 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 26" / 483x660 |
| Tractive Effort (lbs / kg) | 23,815 / 10802.32 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.97 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 260 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.75 / 4.50 |
| Firebox Area (sq ft / m2) | 174.50 / 16.22 |
| Grate Area (sq ft / m2) | 34 / 3.16 |
| Evaporative Heating Surface (sq ft / m2) | 2420 / 224.91 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 2420 / 224.91 |
| Evaporative Heating Surface/Cylinder Volume | 283.70 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 6800 |
| Same as above plus superheater percentage | 6800 |
| Same as above but substitute firebox area for grate area | 34,900 |
| Power L1 | 8620 |
| Power MT | 481.41 |