This small class of Decapods constituted conversions from the CP's 0-6-6-0s of 1911. Even though there were only six locomotives, they made up 3 subclasses based on the number of 2 1/4" tubes in the boiler. The one R2a had 156 (for a total of 2,405 sq ft EHS including the 22 flues all 3 classes had), the 4 R2bs had 151 as shown in the specs, and the R1c had 167 tubes. This last locomotive also had slightly more firebox heating surface (221 sq ft vs 216 sq ft) for a total of 2,525 sq ft EHS.
Small they were with small boilers, but the CP ran them into the late 1950s.
These oil-burning Decapods came out of the Angus shops in 4 subclasses. They reflected the CP's study of the R2 conversions (see Locobase 4529) and were very similar in size and power.
R3a (2 units), R3b (5 units), and R3c (18 units) all had the same boiler dimensions. The 10 R3d had slightly more firebox area (230 sq ft vs 221). The big difference among the sub-classes seems to have been the size of the journal bearings on the driving axle (the 3rd of 5). The b had 10 1/2" by 21" while the c and d had 11" diameter journals.
Like the R2s, these small, low-drivered Deks ran for decades, only being retired in 1956 through 1965.
| Specifications | ||
|---|---|---|
| Class | R2b | R3 |
| Locobase ID | 4529 | 4530 |
| Railroad | Canadian Pacific | Canadian Pacific |
| Whyte | 2-10-0 | 2-10-0 |
| Road Numbers | 5750-5755 | 5756-5790 |
| Gauge | Std | Std |
| Builder | Canadian Pacific | Canadian Pacific |
| Year | 1916 | 1917 |
| Valve Gear | ||
| Locomotive Length and Weight | ||
| Driver Wheelbase | 20.66' | 22' |
| Engine Wheelbase | 29.79' | 31.12' |
| Ratio of driving wheelbase to overall engine wheebase | 0.69 | 0.71 |
| Overall Wheelbase (engine & tender) | 61.82' | 61.76' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 227500 lbs | 234000 lbs |
| Engine Weight | 247500 lbs | 262000 lbs |
| Tender Light Weight | 139000 lbs | 188000 lbs |
| Total Engine and Tender Weight | 386500 lbs | 450000 lbs |
| Tender Water Capacity | 6000 gals | 9360 gals |
| Tender Fuel Capacity (oil/coal) | 12 tons | 3360 gals |
| Minimum weight per yard of rail on which locomotive could run | 76 lb rail | 78 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 58" | 58" |
| Boiler Pressure | 200 psi | 200 psi |
| Cylinders (dia x stroke) | 23.5" x 32" | 24" x 32" |
| Tractive Effort | 51797 lbs | 54025 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.39 | 4.33 |
| Heating Ability | ||
| Firebox Area | 216 sq. ft | 221 sq. ft |
| Grate Area | 59 sq. ft | 59 sq. ft |
| Evaporative Heating Surface | 2566 | 2621 |
| Superheating Surface | 410 | 628 |
| Combined Heating Surface | 2976 | 3249 |
| Evaporative Heating Surface/Cylinder Volume | 159.73 | 156.43 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 11800 | 11800 |
| Same as above plus superheater percentage | 12980 | 14160 |
| Same as above but substitute firebox area for grate area | 47520 | 53040 |
| Power L1 | 8829 | 10821 |
| Power MT | 427.79 | 509.75 |
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