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Specifications
Specifications
Configuration:;
• Whyte	2-6-0
• UIC	1'Cn
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	4 ft 0 in (1,219 mm)
Adhesive weight	84,000 lb (38,102 kg)
Loco weight	104,000 lb (47,174 kg)
Firebox:
• Grate area	21 sq ft (2.0 m2)
Boiler pressure	140 psi (965 kPa)
Heating surface	1,410 sq ft (131 m2)
Superheater	None
Cylinders	2 outside
Cylinder size	18 in × 26 in (457 mm × 660 mm)

Type and origin
Type and origin
Power type	Steam
Builder	Dübs & Company
Build date	1889
Total produced	25

New South Wales Z24 class
New South Wales Z24 class
	Class Z24 Locomotive
Power type
Type and origin
Power type	Steam
Builder	Dübs & Company
Build date	1889
Total produced	25
Configuration:;
Specifications
Configuration:;
• Whyte	2-6-0
• UIC	1'Cn
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	4 ft 0 in (1,219 mm)
Adhesive weight	84,000 lb (38,102 kg)
Loco weight	104,000 lb (47,174 kg)
Firebox:
• Grate area	21 sq ft (2.0 m2)
Boiler pressure	140 psi (965 kPa)
Heating surface	1,410 sq ft (131 m2)
Superheater	None
Cylinders	2 outside
Cylinder size	18 in × 26 in (457 mm × 660 mm)
Tractive effort
Performance figures
Tractive effort	20,855 lbf (92.77 kN)
Factor of adh.	4.00
Operators
Career
Operators	New South Wales Government Railways
Class	B55, Z24 from 1924
Numbers	55-78, 388-393, 407-410; (2401-2425 from 1924)
Retired	1929–1960
Disposition	4 preserved, 21 scrapped

The Z24 class (formerly B55 class) was a two-cylinder, non-condensing, saturated 2-6-0 ‘ Mogul‘ type steam engine built by Dübs & Company for the New South Wales Government Railways of Australia.

Order

Following the success of the B205 class, in 1889 the New South Wales Government Railways ordered an additional 25 locomotives of a basically similar design from Dübs & Company. These locomotives had a deeper firebox, steel cab and weighed an extra nine tonnes. They were pooled with the B205 class in general working. The first locomotive entered traffic on 10 March 1891 and all were in service by August that year.^[1]^[2]

Operation

They took a generally unobtrusive part in main line goods traffic until displaced by the D50/D53/D55 class locomotives. They then moved on to branch lines until displaced by the C30T class locomotives which arrived in the mid-1920s.^[2]

Demise and preservation

As boiler renewals became due between 1929 and 1960, their numbers were depleted through either scrapping or disposal. Representatives found their way on to the private lines of such organisations as Bunnerong Power Station, Nepean Sand & Gravel at North Richmond and Hunter Valley collieries.^[2]

The last locomotive withdrawn was 2413 in November 1960, following an enthusiast tour to Richmond. It joined 2408 and 2414 at Bunnerong Power Station until 1975.^[1]

Preserved Z24 class locomotives
No.	Year	Current organisation	Location	Status	Ref
2408	1891	Dorrigo Steam Railway & Museum	Dorrigo	Stored
2413	1891	Junee Roundhouse Railway Museum	Junee Roundhouse Railway Museum	Static display
2414	1891	Dorrigo Steam Railway & Museum	Dorrigo	Stored
2419	1891	Transport Heritage NSW	Goulburn Rail Heritage Centre	static display	^[3]

References

^ ^a ^b Oberg, Leon (1984). Locomotives of Australia 1850's - 1980's. Frenchs Forest: Reed Books. p. 65. ISBN 0-730100-05-7.
^ ^a ^b ^c Grunbach, Alex (1989). A Compendium of New South Wales Steam Locomotives. Sydney: Australian Railway Historical Society. pp. 94–95. ISBN 0-909650-27-6.
^ Locomotive, Steam 2419 Office of Environment & Heritage