Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 79 pp. 2+. Works number was 58687 in September 1925.
Essentially identical to the Bear Creek locomotive shown in Locobase 15321, this small, superheated, oil-fired logging Mikado went north to British Columbia. Working in the Menzies Bay area of eastern Vancouver Island, the 4 rolled on 56, 60, and 70 lb/yard (28, 30, 35 kg/metre) rail and was confronted with 6% grades and 30 degree curves (radii of 191 feet).
The 4 served BSW and its successor Macmillan Bloedel (as of 1940) for decades before its retirement. It has had an unusual display history, appearing first in Squamish, BC on the mainland in 1970 and, after another 15 years, being moved to the city of Qualicum Beach down the eastern shore of Vancouver Island from Menzies Bay in 1985, where it remains on display at the Canadian Pacific depot.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 15412 |
| Railroad | Bloedel, Stewart & Welch |
| Country | Canada |
| Whyte | 2-8-2T |
| Number in Class | 1 |
| Road Numbers | 4 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1925 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 26.42 / 8.05 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.45 |
| Overall Wheelbase (engine & tender) (ft / m) | 26.43 / 8.06 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 131,000 / 59,421 |
| Engine Weight (lbs / kg) | 169,000 / 76,657 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2000 / 7.58 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 900 / 3407 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 55 / 27.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 28,541 / 12946.00 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.59 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 134 - 2" / 51 |
| Flues (number - dia) (in / mm) | 21 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 10.67 / 3.25 |
| Firebox Area (sq ft / m2) | 100 / 9.29 |
| Grate Area (sq ft / m2) | 27.70 / 2.57 |
| Evaporative Heating Surface (sq ft / m2) | 1156 / 107.43 |
| Superheating Surface (sq ft / m2) | 242 / 22.49 |
| Combined Heating Surface (sq ft / m2) | 1398 / 129.92 |
| Evaporative Heating Surface/Cylinder Volume | 163.51 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5263 |
| Same as above plus superheater percentage | 6158 |
| Same as above but substitute firebox area for grate area | 22,230 |
| Power L1 | 7556 |
| Power MT | 508.64 |