| NZR S class |
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| Specifications |
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Configuration:
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| • Whyte | 0-6-4T |
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| Gauge | 3 ft 6 in (1,067 mm) |
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| Driver dia. | 36.5 in (0.927 m) |
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| Adhesive weight | 23 long tons (23 t; 26 short tons) |
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| Loco weight | 37.5 long tons (38.1 t; 42.0 short tons) |
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| Firebox: | |
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| • Grate area | 14 sq ft (1.3 m2) |
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| Boiler pressure | 160 psi (1,103 kPa) |
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| Heating surface | 664 sq ft (61.7 m2) |
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| Cylinders | Two, outside |
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| Cylinder size | 13 in × 16 in (330 mm × 406 mm) |
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The NZR S class (later WAGR I class) was a class of seven 0-6-4T single Fairlie steam locomotives operated by New Zealand's Railways Department (NZR) between 1882 and 1927.