Data from "Locomotive Building," The Railroad Gazette, Vol XXXVIII, No 24 (June 1905), p 205. See also the pamphlet that describes the BA & P's big push toward electrification among other such projects "Progress Made in Electrification of Railroads and the Economies Effected Thereby", Presented by the BLE and the BLFE, quoting among others, Railway Age articles from 1914, archived at []. (Many thanks to Dave Stephenson for pointing out the error in Locobase's sources that credited the BA&P with 4-10-0 locomotives.) Works numbers were 41223-41224 in January 1907.
Data from "Schenectady Compound Mastodon Locomotive-Butte, Anaconda & Pacific Railway", Railway and Engineering Review (12 March 1898). Works numbers were 4594-4596.
These three Mastodons were based on the Northern Pacific's nearly identical X-class cross-compound engines (Locobase 929). The boiler had four fewer tubes, but all tubes were 11" longer, which resulted in more heating surface. After the BA&P's electrification was completed in 1914, the class was idled until it was sold in 1917 to the Nashville, Chattanooga & St Louis as their class I1-44. They were renumbered 850-852 and simpled in 1920; see Locobase 14418. The NC&StL operated the engines in transfer service or as heavy switchers for a decade or more, retiring the 852 in September 1926, the 850 in November 1927, and the 851 in May 1932.
Principal Dimensions by Steve Llanso of Sweat House Media | ||
---|---|---|
Class | 23 | 36 |
Locobase ID | 11467 | 14417 |
Railroad | Butte, Anaconda & Pacific | Butte, Anaconda & Pacific |
Country | USA | USA |
Whyte | 4-8-0 | 4-8-0 |
Number in Class | 2 | 3 |
Road Numbers | 23-24 | 36-38/16-18 |
Gauge | Std | Std |
Number Built | 2 | 3 |
Builder | Alco-Brooks | Schenectady |
Year | 1907 | 1897 |
Valve Gear | Stephenson | Stephenson |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 15.75 / 4.80 | |
Engine Wheelbase (ft / m) | 26.75 / 8.15 | |
Ratio of driving wheelbase to overall engine wheelbase | 0.59 | |
Overall Wheelbase (engine & tender) (ft / m) | 53.42 / 16.28 | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
Weight on Drivers (lbs / kg) | 173,480 / 78,689 | 154,000 / 69,853 |
Engine Weight (lbs / kg) | 212,740 / 96,497 | 193,000 / 87,543 |
Tender Loaded Weight (lbs / kg) | 112,000 | 112,000 / 50,802 |
Total Engine and Tender Weight (lbs / kg) | 324,740 | 305,000 / 138,345 |
Tender Water Capacity (gals / ML) | 5500 / 20.83 | 4500 / 17.05 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 10 / 9 | 9.50 / 9 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 72 / 36 | 64 / 32 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 56 / 1422 | 56 / 1422 |
Boiler Pressure (psi / kPa) | 210 / 14.50 | 210 / 14.50 |
High Pressure Cylinders (dia x stroke) (in / mm) | 23" x 32" / 584x813 (1) | 23" x 32" / 584x813 (1) |
Low Pressure Cylinders (dia x stroke) (in / mm) | 34" x 32" / 864x813 (1) | 34" x 32" / 864x813 (1) |
Tractive Effort (lbs / kg) | 37,018 / 16791.10 | 37,018 / 16791.10 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.69 | 4.16 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 414 - 2.25" / 57 | 328 - 2.25" / 57 |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | 15 / 4.57 | 14 / 4.27 |
Firebox Area (sq ft / m2) | 206.51 / 19.19 | |
Grate Area (sq ft / m2) | 34.75 / 3.23 | 35 / 3.25 |
Evaporative Heating Surface (sq ft / m2) | 3380 / 314.13 | 2895 / 268.95 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 3380 / 314.13 | 2895 / 268.95 |
Evaporative Heating Surface/Cylinder Volume | 439.15 | 376.14 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 7298 | 7350 |
Same as above plus superheater percentage | 7298 | 7350 |
Same as above but substitute firebox area for grate area | 43,367 | |
Power L1 | 4579 | |
Power MT | 262.21 |