Class of Australian 4-6-4T locomotives
| WAGR Dd class |
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 Dd592 passes through Jandakot with an ARHS excursion train, 1986 |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-4T |
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| Gauge | 3 ft 6 in (1,067 mm) |
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| Driver dia. | 4 ft 6 in (1,372 mm) |
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| Length | 43 ft 3 in (13.18 m) |
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| Loco weight | 72 long tons 0 cwt (161,300 lb or 73.2 t) |
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| Fuel type | Coal |
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| Water cap. | 1,820 imp gal (8,300 L; 2,190 US gal) |
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| Firebox: | |
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| • Grate area | 18.6 sq ft (1.73 m2) |
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| Boiler pressure | 160 lbf/in2 (1.10 MPa) |
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| Cylinder size | 18 in × 23 in (457 mm × 584 mm) |
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| Valve gear | Walschaerts |
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The WAGR Dd class was a class of 4-6-4T tank locomotive operated by the Western Australian Government Railways (WAGR) between 1946 and 1972.
