New South Wales Z24 class locomotive

The Z24 class (formerly B55 class) was a two-cylinder, non-condensing, saturated 2-6-0 ‘ Mogul‘ type steam engine built by Dübs and Company for the New South Wales Government Railways of Australia.[1][2][3]

New South Wales Z24 class
Class Z24 Locomotive
Type and origin
Power typeSteam
BuilderDübs and Company
Build date1889
Total produced25
Specifications
Configuration:
​
 • Whyte2-6-0
 • UIC1'Cn
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver dia.4 ft 0 in (1,219 mm)
Adhesive weight84,000 lb (38,102 kg)
Loco weight104,000 lb (47,174 kg)
Firebox:
 • Firegrate area		21 sq ft (2.0 m2)
Boiler pressure140 psi (965 kPa)
Heating surface1,410 sq ft (131 m2)
SuperheaterNone
CylindersTwo, outside
Cylinder size18 in × 26 in (457 mm × 660 mm)
Performance figures
Tractive effort20,855 lbf (92.77 kN)
Factor of adh.4.00
Career
OperatorsNew South Wales Government Railways
ClassB55, Z24 from 1924
Numbers55-78, 388-393, 407-410
(2401-2425 from 1924)
Retired1929–1960
Disposition4 preserved, 21 scrapped

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 and 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.[4][5]

Operation

They took a generally unobtrusive part in main line goods traffic until displaced by the T524/TF939/K1353 class locomotives. They then moved on to branch lines until displaced by the C30T class locomotives which arrived in the mid-1920s.

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 Region collieries.

The last locomotive withdrawn was 2413 in November 1960, following an enthusiast tour to Richmond.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.[4]

Preserved Z24 class locomotives
No.DescriptionManufacturerYearCurrent organisationLocationStatusRef
24082-6-0 goodsDübs and Company1891Dorrigo Steam Railway and MuseumDorrigostored
24132-6-0 goodsDübs and Company1891Canberra Railway MuseumJuneeStatic display
24142-6-0 goodsDübs and Company1891Dorrigo Steam Railway and MuseumDorrigostored
24192-6-0 goodsDübs and Company1891Transport Heritage NSWGoulburnstatic exhibit NSW Locomotive, Steam 2419[6]

References
Bunnerong Power Station No7, formerly 2408
  1. Preston, Ron G (1984). Tender into Tank. Sydney: New South Wales Rail Transport Museum. pp. 11–57. ISBN 0 909862 18 4.
  2. 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.
  3. New South Wales Railways 1855-1955. Published by Department of Railways
  4. Oberg, Leon (1984). Locomotives of Australia 1850's - 1980's. Frenchs Forest: Reed Books. p. 65. ISBN 0 730100 05 7.
  5. Grunbach, Alex (1989). A Compendium of New South Wales Steam Locomotives. Sydney: Australian Railway Historical Society, NSW Division. pp. 94–95. ISBN 0 909650 27 6.
  6. "Heritage places and items: Locomotive, Steam 2419". Office of Environment & Heritage. NSW Government. Retrieved 20 May 2010.
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