Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 43, p. 196. Works numbers were 38678-38679 in November 1912.
The Illinois Southern was a bridge line that was formed in 1910 to consolidate the bankrupt Southern Illinois and the Southern Missouri. In 1920, the Missouri-Illinois was formed through the reorganization of the SI. The two Mikados in this entry retained their numbers under the new ownership.
501 had the shorter life and suffered a more violent end when its boiler exploded in 1930. 502 was later sold to the Missouri Pacific as their 1282 and operated until May 1952.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 501 |
| Locobase ID | 14116 |
| Railroad | Illinois Southern |
| Country | USA |
| Whyte | 2-8-2 |
| Number in Class | 2 |
| Road Numbers | 501-502 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Baldwin |
| Year | 1912 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15.33 / 4.67 |
| Engine Wheelbase (ft / m) | 30 / 9.14 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.51 |
| Overall Wheelbase (engine & tender) (ft / m) | 58.08 / 17.70 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 160,000 / 72,575 |
| Engine Weight (lbs / kg) | 197,000 / 89,358 |
| Tender Loaded Weight (lbs / kg) | 130,000 / 58,967 |
| Total Engine and Tender Weight (lbs / kg) | 327,000 / 148,325 |
| Tender Water Capacity (gals / ML) | 7000 / 26.52 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12 / 11 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 67 / 33.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 56 / 1422 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 22" x 28" / 559x711 |
| Tractive Effort (lbs / kg) | 37,026 / 16794.73 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.32 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 344 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.50 / 4.42 |
| Firebox Area (sq ft / m2) | 194.90 / 18.11 |
| Grate Area (sq ft / m2) | 34.90 / 3.24 |
| Evaporative Heating Surface (sq ft / m2) | 2792 / 259.38 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 2792 / 259.38 |
| Evaporative Heating Surface/Cylinder Volume | 226.62 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 6282 |
| Same as above plus superheater percentage | 6282 |
| Same as above but substitute firebox area for grate area | 35,082 |
| Power L1 | 5136 |
| Power MT | 283.07 |
