The single simple-expansion Angus supplied to the CP as a helper engine over the 2.2% grade in the Canadian Rockies. A curious feature of this locomotive was the centered position of its 4 cylinders. All four cylinders were cast to the same design with inboard valves and outboard cylinders. The front driver set preceded its cylinders, the rear driving set trailed its pair.
Obviously the goal of 50-mph operation was never achieved with this all-adhesion articulated. Like its compound brothers (Locobase 3569), this engine became a 2-10-0 Decapod in 1917.
Designed for helper service over the passes of the Canadian Rockies, these were very unusual Mallets for a variety of reasons. They were the only articulateds ever operated by a Canadian railroad and they had the two cylinder sets centered under the boiler. As seen in profile, the front driver set led, then its pair of LP cylinder, then the HP cylinders and finally the driver set they drove. As Wiener (1930) points out, this reduced steam pipe length, a reasonable goal especially for compounds.
The boiler had a vertical superheater whose elements intercepted the flow of gas from the boiler to the feedwater heater forward. Externally, this showed as a box on the boiler over the front cylinder set.
Although these can't be seen as failures, the CP decided on rigid-wheelbase locomotives of greater power (culminating in the 2-10-4 Selkirks) and this 5-engine class (and one more simple-expansion variant, which see at Locobase 3570) were converted to 2-10-0 Decapods in 1917. (See Locobase 4529).
| Specifications | ||
|---|---|---|
| Class | R1 | R1 - compound |
| Locobase ID | 3570 | 3569 |
| Railroad | Canadian Pacific | Canadian Pacific |
| Whyte | 0-6-6-0 | 0-6-6-0 |
| Road Numbers | 5755 | 5750-5754 |
| Gauge | Std | Std |
| Builder | Angus Works | Angus Works |
| Year | 1909 | 1909 |
| Valve Gear | Walschaert | |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 10.33' | 10.33' |
| Engine Wheelbase | 35.17' | 35.17' |
| Ratio of driving wheelbase to overall engine wheebase | 0.29 | 0.29 |
| Overall Wheelbase (engine & tender) | 60.80' | 60.80' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 262000 lbs | 262000 lbs |
| Engine Weight | 262000 lbs | 262000 lbs |
| Tender Light Weight | 133000 lbs | 133000 lbs |
| Total Engine and Tender Weight | 395000 lbs | 395000 lbs |
| Tender Water Capacity | 5900 gals | 5900 gals |
| Tender Fuel Capacity (oil/coal) | 13.4 tons | 13.4 tons |
| Minimum weight per yard of rail on which locomotive could run | 72.78 lb rail | 72.78 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 58" | 58" |
| Boiler Pressure | 200 psi | 200 psi |
| Cylinders (dia x stroke) | 20" x 26" (4) | 23.25" x 26" |
| Low Pressure Cylinders (dia x stroke) | " x " | 34" x 26" |
| Tractive Effort | 60966 lbs | 56138 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.30 | 4.67 |
| Heating Ability | ||
| Firebox Area | 185 sq. ft | 185 sq. ft |
| Grate Area | 59 sq. ft | 59 sq. ft |
| Evaporative Heating Surface | 2950 | 2950 |
| Superheating Surface | 548 | 548 |
| Combined Heating Surface | 3498 | 3498 |
| Evaporative Heating Surface/Cylinder Volume | 156.02 | 230.90 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 11800 | 11800 |
| Same as above plus superheater percentage | 13648.60 | 13648.60 |
| Same as above but substitute firebox area for grate area | 42796.46 | 42796.46 |
| Power L1 | 9005.24 | 6232.00 |
| Power MT | 454.65 | 314.64 |
| This page last modified: . | [Contact] | All material © 1999-2010 SteamLocomotive.com |