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The NZR S class (later WAGR I class) was a class of seven 0-6-4T single Fairlie steam locomotives used in New Zealand.

NZR S class
Type and origin Power type Steam Builder Avonside Engine Co., England[1] Build date 1880-1881
Specifications Configuration: ​  • Whyte 0-6-4T Gauge 3 ft 6 in (1,067 mm) Driver dia. 36.5 in (0.927 m) Adhesive weight 23 long tons (23 t; 26 short tons) Loco weight 37.5 long tons (38.1 t; 42.0 short tons) Firebox:  • Firegrate area 14 sq ft (1.3 m2) Boiler pressure 160 psi (1,103 kPa) Heating surface 664 sq ft (61.7 m2) Cylinders Two, outside Cylinder size 13 in × 16 in (330 mm × 406 mm)
Performance figures Tractive effort 9,480 lbf (42.17 kN)
Career Operators New Zealand Railways Department Number in class 7

History

The locomotives were ordered by the New Zealand Railways Department (NZR) in 1880, and delivered from the Avonside engine works in 1881–1882. They were considerably larger than the earlier R class, and all saw service in the Wanganui district, with its abundance of sharp curves and grades. These two classes of Single Fairlies were considerably more popular with the engine crews than their older Double Fairlie counterparts, which often suffered frame breakages whilst operating in the Wanganui district.

Sale to WAGR

In 1891 despite complaining of a lack of motive power, the residing chief mechanical engineer T.F. Rotheram arranged the shipment of three of this class to the Western Australian Government Railways (WAGR),[1] where they were classified as the I class. They remained in service for WAGR until 1900.[2]

See also

• NZR E class (1872)
• NZR B class (1874)
• NZR R class
• Locomotives of New Zealand

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