Data from "Ten-Wheeled Compound Tank Engine, Belfast & County Down Railway," The Locomotive Magazine, Vol V (September 1900), p. 145. Boiler pressure is an estimate.
These were used for working the heavy passenger traffic between Belfast and Bangor. Interestingly, 22 was converted to simple expansion within a couple of years of their arrival.
Data from "Recent Belfast & County Down Ry Locomotives," The Locomotive Magazine, Vol IX (26 September 1903), p. 187. Works numbers were 4231-4233.
Described as "extremely fine locomotives," this set of 10-wheel tanks were reported to work both local traffic and main-line trains "very satisfactorily." They had a long wheelbase and large-diameter trailing wheels.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 21 | 3 |
| Locobase ID | 10159 | 10379 |
| Railroad | Belfast & County Down | Belfast & County Down |
| Country | Ireland | Ireland |
| Whyte | 4-4-2T | 4-4-2T |
| Number in Class | 2 | 3 |
| Road Numbers | 21-22 | 3, 15, 30 |
| Gauge | 5'3" | 5'3" |
| Number Built | 2 | 3 |
| Builder | Beyer, Peacock | Beyer, Peacock |
| Year | 1900 | 1901 |
| Valve Gear | Walschaert | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 8.75 / 2.67 | 8.25 / 2.51 |
| Engine Wheelbase (ft / m) | 27.25 / 8.31 | |
| Ratio of driving wheelbase to overall engine wheelbase | 0.30 | |
| Overall Wheelbase (engine & tender) (ft / m) | ||
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | ||
| Engine Weight (lbs / kg) | 124,320 / 56,391 | |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | ||
| Tender Water Capacity (gals / ML) | 1380 / 5.23 | 1920 / 7.27 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | ||
| Minimum weight of rail (calculated) (lb/yd / kg/m) | ||
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 60 / 1524 | 66 / 1676 |
| Boiler Pressure (psi / kPa) | 160 / 1100 | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18.5" x 24" / 470x610 (1) | 17" x 24" / 432x610 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 26.5" x 24" / 673x610 (1) | |
| Tractive Effort (lbs / kg) | 12,518 / 5678.08 | 14,292 / 6482.75 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | ||
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 192 - 1.875" / 48 | |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | ||
| Firebox Area (sq ft / m2) | 102 / 9.48 | |
| Grate Area (sq ft / m2) | 19 / 1.77 | 17.20 / 1.60 |
| Evaporative Heating Surface (sq ft / m2) | 1130 / 105.02 | |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 1130 / 105.02 | |
| Evaporative Heating Surface/Cylinder Volume | 179.22 | |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 3040 | 2752 |
| Same as above plus superheater percentage | 3040 | 2752 |
| Same as above but substitute firebox area for grate area | 16,320 | |
| Power L1 | 4578 | |
| Power MT | ||