New South Wales Z21 class locomotive

4 ft 8+1⁄2 in (1,435 mm) standard gauge^[1]Driver dia.5 ft 1 in (1,549 mm)^[1]Boiler pressure140 psi (965 kPa)^[1]Cylinder size18 in × 26 in
(457 mm × 660 mm)^[1]

Performance figures
Tractive effort	15,467 lbf (68.80 kN)^[1]

Career
First run	March 1885^[1]
Disposition	All scrapped by 1941^[1]

The Z21 class (formerly L.304 class) was a class of steam locomotives built for the New South Wales Government Railways in Australia.^[2]^[3]^[4]

Wheel arrangement

The wheel arrangement for the Z21 class was 2-6-0. Under the Whyte notation for the classification of steam locomotives, 2-6-0 represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, six powered and coupled driving wheels on three axles and no trailing wheels.^{[citation needed]} This arrangement is commonly called a Mogul.^[5]^{[citation needed]}

History

The last engine was scrapped in 1941.^[1]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Oberg, Leon (1975). Locomotives of Australia. p. 54. ISBN 0-589-07173-4.
^ Preston, Ron G (1984). Tender into Tank. Sydney: New South Wales Rail Transport Museum. pp. 11–57. ISBN 0-909862-18-4.
^ Grunbach, Alex (1989). A Compendium of New South Wales Steam Locomotives. Sydney: Australian Railway Historical Society, NSW Division. pp. 41–45. ISBN 0-909650-27-6.
^ New South Wales Railways 1855-1955. Published by Department of Railways
^ "American Steam Locomotive Wheel Arrangements". www.steamlocomotive.com. Retrieved 25 October 2016.