These were among the very last steam locomotives built by Baldwin for any railroad. An Australian railway department press release noted that these were the only Mikados on the NSW system and were the first Baldwins to have been imported since the 1906 P6 class.
These Mikados were ordered from the Baldwin Locomotive Works and the USATC. The S200 design of WWII (Locobase 958) was chosen because it was an existing design that met the NSW loading gauge. However, the tender was shortened so that the locomotives could be turned on existing 60 foot turntables in the proposed areas of operation.
Works numbers were 75564-75583 in 1951. They had cast-steel frames with integral cylinders and the 10" piston valves could be relined.
All 20 were delivered as oil burners, but in 1962-1965, the NSW converted seventeen of the engines to coal burning. Adhesion weight increased to 147,840 lb (66 long tons). Loaded engine weight climbed to 206,080 lb (92 tons). The lighter tender weighed 132,160 lb (59 tons) and held 12.1 short tons (11 tons) and 6,540 US gallons (5,550 Imp gal).
Data from publicity handout reproduced at [] and [] . Works numbers were 75564-75583 in 1951.
An American Mikado produced very late in the steam era. They were among the very last Baldwin steam locomotives built for anyone. An Australian railway department press release noted that these were the only Mikados on the NSW and were the first Baldwins to have been imported since the 1906 P6 class.
Like all late Baldwins, the cast-steel frame had integral cylinders. These and the 10"(254 mm) piston valves could be relined. A photograph depicts orthodox American good looks mated to a stubby tender. So small a tender was necessary to fit the assembly on a 60' turntable.
In 1962-1965, the NSW converted seventeen of the engines to coal burning. Adhesion weight increased to 147,840 lb (66 long tons), loaded engine weight climbed to 206,080 lb (92 tons). The lighter tender weighed 132,160 lb (59 tons) and held 12.1 short tons (11 tons) and 6,540 US gallons (5,550 Imp gal).
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | D59 |
Locobase ID | 2418 |
Railroad | New South Wales |
Country | Australia |
Whyte | 2-8-2 |
Number in Class | 20 |
Road Numbers | 5901-5920 |
Gauge | Std |
Number Built | 20 |
Builder | Baldwin |
Year | 1952 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 15.75 / 4.80 |
Engine Wheelbase (ft / m) | 32.75 / 9.98 |
Ratio of driving wheelbase to overall engine wheelbase | 0.48 |
Overall Wheelbase (engine & tender) (ft / m) | 58 / 17.68 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 36,400 / 16,511 |
Weight on Drivers (lbs / kg) | 145,412 / 65,958 |
Engine Weight (lbs / kg) | 201,152 / 91,241 |
Tender Loaded Weight (lbs / kg) | 135,520 / 61,471 |
Total Engine and Tender Weight (lbs / kg) | 336,672 / 152,712 |
Tender Water Capacity (gals / ML) | 6600 / 25 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2880 / 10,901 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 61 / 30.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 60 / 1524 |
Boiler Pressure (psi / kPa) | 204.50 / 1410 |
High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 28" / 533x711 |
Tractive Effort (lbs / kg) | 35,773 / 16226.38 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.06 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 139 - 2" / 51 |
Flues (number - dia) (in / mm) | 30 - 5.375" / 137 |
Flue/Tube length (ft / m) | 17.50 / 5.33 |
Firebox Area (sq ft / m2) | 163 / 15.15 |
Grate Area (sq ft / m2) | 47 / 4.37 |
Evaporative Heating Surface (sq ft / m2) | 2148 / 199.63 |
Superheating Surface (sq ft / m2) | 624 / 57.99 |
Combined Heating Surface (sq ft / m2) | 2772 / 257.62 |
Evaporative Heating Surface/Cylinder Volume | 191.36 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 9612 |
Same as above plus superheater percentage | 11,822 |
Same as above but substitute firebox area for grate area | 41,000 |
Power L1 | 15,630 |
Power MT | 947.88 |