Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 24, p.170. See also Ron Fitch, Australian Railwayman: From Cadet Engineer to Railways Commissioner (Rosenberg Publishing, 2006) pp. 56-57. Works numbers were 20152-20158 in February 1902.
These locomotives are described in Fitch's book as "unlike any others in use in Western Australia". He notes that they "cost only a few thousand pounds each, even after modification." Modified for use on the lightly built Murchison line, they had "high slung boilers, which permitted unrestricted view from one side of the locomotive to the other."
Their "distinctive clatter" apparently indicated a source of later trouble when the engines were misused. In the 1930s, an engineer ran his charge at a higher-than-recommended speed and induced a hammer blow that distorted the track badly. Chief of Mechanical Engineer Dick Broadfoot reduced the size of the counterweights, but the hammering continued until he realized that holes in the drivers had been filled with lead, which only increased the stress.
Data from Howell, Comparative Statistics of the Australasian Railways, Journal of the Royal Statistical Society, March 1899, pp. 96-97.
When the G-class Moguls (Locobase 9562) proved too light-footed forward to remain on the tracks, the WAGR modified the design, substituting a bogie for the Bissel truck. They remained in mainline service for only a short time, but achieved much longer careers as timberline locomotives.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | C | G - second |
| Locobase ID | 12595 | 9563 |
| Railroad | Western Australia | Western Australia |
| Country | Australia | Australia |
| Whyte | 4-6-0 | 4-6-0 |
| Number in Class | 7 | 22 |
| Road Numbers | 264-270 | |
| Gauge | 3'6" | 3'6" |
| Number Built | 7 | 22 |
| Builder | Burnham, Williams & Co | Dubs & Co |
| Year | 1902 | 1897 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 10 / 3.05 | |
| Engine Wheelbase (ft / m) | 21.46 / 6.54 | |
| Ratio of driving wheelbase to overall engine wheelbase | 0.47 | |
| Overall Wheelbase (engine & tender) (ft / m) | ||
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 62,500 / 28,350 | |
| Engine Weight (lbs / kg) | 83,000 / 37,648 | 59,920 / 27,179 |
| Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 | 37,586 / 17,049 |
| Total Engine and Tender Weight (lbs / kg) | 143,000 / 64,864 | 97,506 / 44,228 |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 | 1440 / 5.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.20 / 2 | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 35 / 17.50 | |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 49 / 1245 | 39 / 991 |
| Boiler Pressure (psi / kPa) | 200 / 1380 | 140 / 970 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16.5" x 22" / 419x559 | 14.5" x 20" / 368x508 |
| Tractive Effort (lbs / kg) | 20,780 / 9425.66 | 12,831 / 5820.05 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.01 | |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 197 - 1.75" / 44 | |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 13.83 / 4.22 | |
| Firebox Area (sq ft / m2) | 81.80 / 7.60 | 72 / 6.69 |
| Grate Area (sq ft / m2) | 17.80 / 1.65 | 14.60 / 1.36 |
| Evaporative Heating Surface (sq ft / m2) | 1320 / 122.68 | 780 / 72.49 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 1320 / 122.68 | 780 / 72.49 |
| Evaporative Heating Surface/Cylinder Volume | 242.44 | 204.06 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 3560 | 2044 |
| Same as above plus superheater percentage | 3560 | 2044 |
| Same as above but substitute firebox area for grate area | 16,360 | 10,080 |
| Power L1 | 5187 | 2714 |
| Power MT | 548.90 | |