Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 49, p. 239. See also Leon Oberg, Locomotives of Australia, 1854 to 2007 (New South Wales: Rosenberg Publishing Pty Ltd, 2007), pp. 167-168. Works numbers were 41242-41243 in March 1914.
Broken Hill was incorporated in Victoria State in 1885 to mine lead, silver, and zinc at the site in New South Wales. These engines were headed to Hummock Hill near Whyalla in South Australia to pull trains of rich (68%) iron ore. Their size and power was directed as satisfying a relatively stiff requirement: "Loco to make an average speed of 20 miles per hour [32.2 km/h] of 35 miles [56.4 km], including 2 1/2 miles [4 km] on a grade of 1 in 100. Haulage capacity on the level to be 870 tons back of tender."
Oberg notes that under the same conditions (which he doesn't specify), "these large-boilered engines could manage loads of up to 360 tonnes [396 short tons] agains the Beyer, Peackock's 2-6-2T No. 2's 180 tonnes [198 short tons]." The latter engine is shown in Locobase 5888.
As demand increased, the Ten-wheelers were supplanted by 2-8-2s produced by Baldwin in 1920, 1928, and 1938. The latter resulted in the relegation of 4 & 5 to shunting and water-train duties. 5 was scrapped soon after dieselization began in 1956, but 4's steam was used for energizing pile drivers for several more years. It was preserved without its tender by the National Rail Museum in Port Adelaide.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 14228 |
| Railroad | Broken Hill Proprietary |
| Country | Australia |
| Whyte | 4-6-0 |
| Number in Class | 1 |
| Road Numbers | 4-5 |
| Gauge | 3'6" |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1916 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11 / 3.35 |
| Engine Wheelbase (ft / m) | 20.33 / 6.20 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.54 |
| Overall Wheelbase (engine & tender) (ft / m) | 46.37 / 14.13 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 72,000 / 32,659 |
| Engine Weight (lbs / kg) | 89,000 / 40,370 |
| Tender Loaded Weight (lbs / kg) | 56,000 / 25,401 |
| Total Engine and Tender Weight (lbs / kg) | 145,000 / 65,771 |
| Tender Water Capacity (gals / ML) | 2800 / 10.61 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 40 / 20 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 22" / 406x559 |
| Tractive Effort (lbs / kg) | 19,584 / 8883.16 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.68 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 200 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12.50 / 3.81 |
| Firebox Area (sq ft / m2) | 110 / 10.22 |
| Grate Area (sq ft / m2) | 17.80 / 1.65 |
| Evaporative Heating Surface (sq ft / m2) | 1410 / 130.99 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1410 / 130.99 |
| Evaporative Heating Surface/Cylinder Volume | 275.41 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3204 |
| Same as above plus superheater percentage | 3204 |
| Same as above but substitute firebox area for grate area | 19,800 |
| Power L1 | 5053 |
| Power MT | 464.16 |