| Commonwealth Railways NM class |
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| Type and origin |
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| Power type | Steam |
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| Builder | Thompson & Co, Castlemaine |
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| Build date | 1925-1927 |
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| Total produced | 22 |
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| Specifications |
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Configuration:
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| • Whyte | 4-8-0 |
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| Gauge | 1,067 mm (3 ft 6 in) |
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| Fuel type | Coal |
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| Firebox: | |
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| • Grate area | 18.5 sq ft (1.72 m2) |
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| Boiler pressure | 160 psi (11 bar; 1,100 kPa) |
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| Cylinder size | 17 in × 22 in (432 mm × 559 mm) |
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The Commonwealth Railways NM class locomotive was a class of 4-8-0 locomotives of the Commonwealth Railways, Australia. The class operated on 1,067 mm (3 ft 6 in) narrow gauge lines in South Australia and the Northern Territory.