NZR S class

NZR S class
Type and origin
Power type Steam
Builder Avonside Engine Co., England
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

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

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.

In the 1880s 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.

S class roster

Road
number		Builders
number		In
service		Written
off		Comments
NZR S class steam locomotives
2121279/188013 Apr 1882Mar 1927
2131280/188017 Jul 1882Mar 1927
2141284/188020 Jul 1883Mar 1922
2151283/188018 Feb 1885Aug 1891Sold to WAGR. In service as I 25 1891-1900.
2161285/188025 Feb 1885Aug 1891Sold to WAGR. In service as I 26 1891-1900.
2171281/188031 Jul 1886Aug 1891Sold to WAGR. In service as I 27 1891-1900.
2181282/188021 May 1887Mar 1927

References

    • Register of New Zealand Railways Steam Locomotives 1863-1971. pp. 59 & 158. ISBN 0-9582072-1-6.
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