New South Wales Z23 class locomotive

Class of Australian 4-6-0 locomotives

New South Wales Z23 Class

O.446 Class Locomotive

Type and origin
Power type	Steam
Builder	Baldwin Locomotive Works
Build date	1891
Total produced	12

Specifications
Configuration:
• Whyte	4-6-0
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	5 ft 1 in (1,549 mm)
Total weight	90.37 long tons (101.21 short tons; 91.82 t)
Firebox:
• Grate area	27.7 sq ft (2.57 m)
Boiler pressure	160 psi (1,100 kPa)
Cylinder size	21 in × 24 in (533 mm × 610 mm)

Performance figures
Tractive effort	22,209 lbf (98.79 kN)

Career
Withdrawn	1933-1946
Disposition	All scrapped

The Z23 class (formerly O.446 class) was a class of steam locomotives built in 1891 for the New South Wales Government Railways in Australia.

Royal Commission

Although this may have been the result of a contemporary anti-American bias, these locomotives were said to be too heavy and too wide at the cylinders, and were the subject of a Royal Commission.

Withdrawal

2305 was the first withdrawn in May 1933. By 1941, only six were left, with the last, 2304, being withdrawn in September 1946. None has survived onto preservation.

References

^ Oberg, Leon (1975). Locomotives of Australia. p. 73. 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
"BALDWIN ENGINE COMMISSION". The Sydney Morning Herald. National Library of Australia. 26 May 1892. p. 6. Retrieved 27 October 2014.