Data from C & NW 10 - 1952 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 45976-45977 in July 1917.
Drury (1993) tells us that these two locomotives originally went into service with the CStPM&O as 2-10-2 Santa Fes. Apparently the wheel arrangement didn't fit North Western requirements as these were the only two of that layout. In 1944, the locomotives went to the Proviso Yard as heavyweight switchers. After suffering derailments over the hump, the railroad removed the front truck and these very big 0-10-2s resulted. The 492 was scrapped in 1949, 491 in 1953.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | J-1 |
| Locobase ID | 8384 |
| Railroad | Chicago & North Western (C&NW) |
| Country | USA |
| Whyte | 0-10-2 |
| Number in Class | 2 |
| Road Numbers | 491-492 |
| Gauge | Std |
| Number Built | |
| Builder | C&NW |
| Year | 1944 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 21 / 6.40 |
| Engine Wheelbase (ft / m) | 30.50 / 9.30 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.69 |
| Overall Wheelbase (engine & tender) (ft / m) | 63.17 / 19.25 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 297,400 / 134,899 |
| Engine Weight (lbs / kg) | 322,700 / 146,374 |
| Tender Loaded Weight (lbs / kg) | 159,100 / 72,167 |
| Total Engine and Tender Weight (lbs / kg) | 481,800 / 218,541 |
| Tender Water Capacity (gals / ML) | 6275 / 23.77 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 13 / 12 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 99 / 49.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 57 / 1448 |
| Boiler Pressure (psi / kPa) | 205 / 1410 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 27" x 32" / 686x813 |
| Tractive Effort (lbs / kg) | 71,314 / 32347.52 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.17 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 234 - 2" / 51 |
| Flues (number - dia) (in / mm) | 45 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 21 / 6.40 |
| Firebox Area (sq ft / m2) | 317.50 / 29.51 |
| Grate Area (sq ft / m2) | 66.50 / 6.18 |
| Evaporative Heating Surface (sq ft / m2) | 4233 / 393.40 |
| Superheating Surface (sq ft / m2) | 1052 / 97.77 |
| Combined Heating Surface (sq ft / m2) | 5285 / 491.17 |
| Evaporative Heating Surface/Cylinder Volume | 199.58 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 13,633 |
| Same as above plus superheater percentage | 16,359 |
| Same as above but substitute firebox area for grate area | 78,105 |
| Power L1 | 14,038 |
| Power MT | 520.32 |