| Rhodesia Railways 15th class |
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15th class No. 417 arrives at Thomson Junction, Zimbabwe, with a freight train from Victoria Falls |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-4+4-6-4 |
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| Gauge | 3 ft 6 in (1,067 mm) Cape gauge |
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| Driver dia. | 57 in (1,448 mm) |
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| Axle load | 14 long tons 15 cwt (33,000 lb or 15 t) |
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| Adhesive weight | 76 long tons 19 cwt (172,400 lb or 78.2 t) |
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| Loco weight | 180 long tons 18 cwt (405,200 lb or 183.8 t) |
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| Firebox: | |
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| • Grate area | 47.5 sq ft (4.41 m2) |
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| Boiler pressure | 15th: 180 psi (1.24 MPa)
15A: 200 psi (1.38 MPa) |
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| Heating surface: | |
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| • Firebox | 212 sq ft (19.7 m2) |
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| • Tubes and flues | 2,110 sq ft (196 m2) |
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Superheater:
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| • Heating area | 494 sq ft (45.9 m2) |
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| Cylinders | Four |
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| Cylinder size | 17.5 in × 26 in (444 mm × 660 mm) |
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| Performance figures |
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| Tractive effort | 15th: 42,740 lbf (190.1 kN)
15A: 47,490 lbf (211.2 kN) |
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The Rhodesia Railways 15th class (later Zambia Railways and National Railways of Zimbabwe 15th classes), was the second-largest class of Garratt locomotives, with 74 locomotives built. Only the Class GMA/GMAM of the South African Railways was more numerous at 120 locomotives.
