Ray & Gila Valley 2-8-2 "Mikado" Locomotives in the USA
Class Details by Steve Llanso of Sweat House Media
Class 4 (Locobase 13800)
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 39, p. 13. See also "Kennecott Ray Mines Division" at [
], last accessed 29 January 2012. (Thanks to Steve Low for his 28 March 2021 email reporting inconsistencies that led to a review of this entry.) Works number was 36824 in August 1911.
This small Arizona copper road was opened in 1910 about 120 miles southeast of Phoenix. It had two sections 12 miles apart. The longer piece connected the Ray copper mines to Ray Junction, which met the Phoenix & Eastern. The 2.66-mile linked Hayden Junction on the P & E with the smelter at Hayden.
The company was operated as a common carrier until 1943, when it was bought by Kennecott Copper and taken private. The 4 remained in service after that date.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 13800 |
| Railroad | Ray & Gila Valley |
| Country | USA |
| Whyte | 2-8-2 |
| Number in Class | 1 |
| Road Numbers | 4 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1911 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 14 / 4.27 |
| Engine Wheelbase (ft / m) | 31.83 / 9.70 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 60.42 / 18.42 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 190,000 / 86,183 |
| Engine Weight (lbs / kg) | 240,000 / 108,862 |
| Tender Loaded Weight (lbs / kg) | 145,000 / 65,771 |
| Total Engine and Tender Weight (lbs / kg) | 385,000 / 174,633 |
| Tender Water Capacity (gals / ML) | 8000 / 30.30 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3000 / 11,355 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 79 / 39.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 50 / 1270 |
| Boiler Pressure (psi / kPa) | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 23" x 28" / 584x711 |
| Tractive Effort (lbs / kg) | 47,843 / 21701.25 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.97 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 344 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 19 / 5.79 |
| Firebox Area (sq ft / m2) | 194 / 18.02 |
| Grate Area (sq ft / m2) | 57.20 / 5.32 |
| Evaporative Heating Surface (sq ft / m2) | 4027 / 374.26 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 4027 / 374.26 |
| Evaporative Heating Surface/Cylinder Volume | 299.18 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 10,868 |
| Same as above plus superheater percentage | 10,868 |
| Same as above but substitute firebox area for grate area | 36,860 |
| Power L1 | 5878 |
| Power MT | 272.82 |