Data from DeGolyer, Volume 63, pp. 171+. See also "Recent Designs of Twelve-Wheel Locomotives", Railway Age, Volune 71, No 6 (6 August 1921), pp. 251-252. Baldwin works numbers were 53001-53002 in February 1920.
Muscular narrow-gaugers that were the first Twelve-wheelers in service on the Midland, a 275-mile (443 km) railway in Western Australia. They had slightly inclined cylinders fed by 8" (203 mm) piston valves, arsenical copper fireboxes, and three domes (steam dome flanked by smaller sand domes).
Withdrawn in March 1963.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 19 |
| Locobase ID | 3228 |
| Railroad | Midland Railway |
| Country | Australia |
| Whyte | 4-8-0 |
| Number in Class | 2 |
| Road Numbers | 19-20 |
| Gauge | 3'6" |
| Number Built | 2 |
| Builder | Baldwin |
| Year | 1920 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.75 / 3.89 |
| Engine Wheelbase (ft / m) | 22.04 / 6.72 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.58 |
| Overall Wheelbase (engine & tender) (ft / m) | 47.01 / 14.33 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 80,000 / 36,287 |
| Engine Weight (lbs / kg) | 108,000 / 48,988 |
| Tender Loaded Weight (lbs / kg) | 74,928 / 33,987 |
| Total Engine and Tender Weight (lbs / kg) | 182,928 / 82,975 |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 33 / 16.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 45 / 1143 |
| Boiler Pressure (psi / kPa) | 162.40 / 1120 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 23" / 457x584 |
| Tractive Effort (lbs / kg) | 22,859 / 10368.68 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.50 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 128 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | 19 - 5.25" / 133 |
| Flue/Tube length (ft / m) | 11.25 / 3.43 |
| Firebox Area (sq ft / m2) | 123 / 11.43 |
| Grate Area (sq ft / m2) | 18 / 1.67 |
| Evaporative Heating Surface (sq ft / m2) | 1070 / 99.41 |
| Superheating Surface (sq ft / m2) | 253 / 23.50 |
| Combined Heating Surface (sq ft / m2) | 1323 / 122.91 |
| Evaporative Heating Surface/Cylinder Volume | 157.96 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2923 |
| Same as above plus superheater percentage | 3479 |
| Same as above but substitute firebox area for grate area | 23,770 |
| Power L1 | 7124 |
| Power MT | 785.29 |