| New South Wales D57 class |
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Class D57 locomotive |
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| Specifications |
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Configuration:
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| • Whyte | 4-8-2 |
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| Gauge | 1435 mm (4 ft 8+1⁄2 in) standard gauge |
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| Driver dia. | 5 ft 0 in (1524 mm) |
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| Axle load | 23 long tons (25.8 short tons; 23.4 t) |
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| Adhesive weight | 201,600 lb (91,400 kg) |
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| Loco weight | 310,710 lb (140,936 kg) |
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| Fuel type | Coal |
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| Fuel capacity | 14 long tons (15.7 short tons; 14.2 t) |
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| Water cap. | 9000 imp gal (11,000 US gal; 41,000 L) |
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| Firebox: | |
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| • Grate area | 65 sq ft (6.0 m2) |
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| Boiler pressure | 200 psi (1379 kPa) |
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| Heating surface | 3390 sq ft (315 m2) |
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Superheater:
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| • Heating area | 775 sq ft (72.0 m2) |
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| Cylinders | 3 |
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| Cylinder size | 23.25 in × 28 in (591 mm × 711 mm) |
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| Valve gear | Outside (2): Walschaerts.
Centre (1): Gresley conjugated |
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The New South Wales D57 class is a class of 4-8-2 steam locomotives built for the New South Wales Government Railways in Australia by Clyde Engineering and by Mort's Dock & Engineering Company in respect of the tenders. When they entered service in 1929, they represented a revolution in locomotive design, having a tractive effort 67% higher than the previous most powerful New South Wales locomotive, the 55 class.