Data from CP 1911-24 Locomotive Diagram supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange. CPR works numbers were 1967-1968 in 1914.
These were big switchers with quite sizable coal and water supplies in its tender. Superheat ratios and firebox area:evaporative heating surface area were both appropriately modest and extras like stokers, feed water heaters, and multiple throttles absent. They did have power reverse gear, however.
All three served for more than 40 years before being scrapped in January 1954, September 1955, and February 1957, respectively.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | W1a |
| Locobase ID | 15789 |
| Railroad | Canadian Pacific (CPR) |
| Country | Canada |
| Whyte | 0-10-0 |
| Number in Class | 3 |
| Road Numbers | 6950-6952 |
| Gauge | Std |
| Number Built | 3 |
| Builder | Angus Works |
| Year | 1914 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 18.67 / 5.69 |
| Engine Wheelbase (ft / m) | 18.67 / 5.69 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 55.50 / 16.92 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 48,700 / 22,090 |
| Weight on Drivers (lbs / kg) | 241,000 / 109,316 |
| Engine Weight (lbs / kg) | 241,000 / 109,316 |
| Tender Loaded Weight (lbs / kg) | 170,000 / 77,111 |
| Total Engine and Tender Weight (lbs / kg) | 411,000 / 186,427 |
| Tender Water Capacity (gals / ML) | 8400 / 31.82 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 12 / 11 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 80 / 40 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 51 / 1295 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 23.5" x 30" / 597x762 |
| Tractive Effort (lbs / kg) | 55,225 / 25049.67 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.36 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 210 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 30 - 5.25" / 133 |
| Flue/Tube length (ft / m) | 16.75 / 5.11 |
| Firebox Area (sq ft / m2) | 165 / 15.33 |
| Grate Area (sq ft / m2) | 49.50 / 4.60 |
| Evaporative Heating Surface (sq ft / m2) | 2925 / 271.74 |
| Superheating Surface (sq ft / m2) | 598 / 55.56 |
| Combined Heating Surface (sq ft / m2) | 3523 / 327.30 |
| Evaporative Heating Surface/Cylinder Volume | 194.22 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9900 |
| Same as above plus superheater percentage | 11,583 |
| Same as above but substitute firebox area for grate area | 38,610 |
| Power L1 | 10,308 |
| Power MT | 471.48 |