New South Wales D57 class locomotive

The D57 class was a class of 4-8-2 steam locomotives built by Clyde Engineering for the New South Wales Government Railways in Australia. The tenders were built by Mort's Dock.

New South Wales D57 class
Class D57 Locomotive
Type and origin
Power typeSteam
BuilderClyde Engineering, Granville
Build date1929-1930
Total produced25
Specifications
Configuration:
​
 • Whyte4-8-2
 • UIC2'D1'h3
Gauge4 ft 8 1⁄2 in (1,435 mm) standard gauge
Driver dia.5 ft 0 in (1.524 m)
Axle load23 ton
Adhesive weight201,600 lb (91,400 kg)
Loco weight310,710.4 lb (140,935.9 kg)
Fuel typeCoal
Fuel capacity14 tons
Water cap9,000 imp gal (41,000 l)
Firebox:
 • Firegrate area		65 sq ft (6.0 m2)
Boiler pressure200 psi (1,379 kPa)
Heating surface3,390 sq ft (315 m2)
Superheater:
​
 • Heating area775 sq ft (72.0 m2)
Cylinders3
Cylinder size23.25 in × 28 in (591 mm × 711 mm)
Valve gearOutside (2): Walschaerts. Centre (1): Gresley Conjugated
Performance figures
Maximum speed50 mph (80 km/h)
Tractive effort56,002 lbf (249.1 kN)
Factor of adh.3.60
Career
OperatorsNew South Wales Government Railways
ClassD57
Numbers5701–5725
NicknamesLazy Lizzies
Withdrawn1957–1961
Disposition1 preserved, 24 scrapped

Introduction

The locomotives were among the heaviest of locomotives in Australia with a 23-long-ton (23.4 t; 25.8-short-ton) axle load and this along with their width restricted their sphere of operation to Thirroul on the Illawarra line, Wallerawang on the Main Western line and Junee on the Main South line.[1][2][3]

Due to the immense size of the firebox they could not be hand fired and had to use a mechanical stoker, thus becoming the first New South Wales locomotive class to use a mechanical stoker. They were later followed by the 58 class and the 60 class [4]

They were not permitted to operate on the Main Northern line due to load limitations on some bridges and a tighter loading gauge. They had the highest tractive effort of any conventional engines used in Australia and were of approximately equal capability to the modified 60 class Garratt locomotives. They were very reliable and had the nickname Lazy Lizzies because they made heavy workings seem effortless.[5] Another nickname was bestowed on the class, Chuckling Charlies due to their syncopated exhaust beat.[6]

The three cylinder design fitted to the class gave it a distinctive off-beat exhaust sound when climbing upgrade. This design was also fitted to the 58 class. However, a couple of features, such as the Gresley conjugating valve gear fitted to these locomotives has been the source of debate as to its efficiency.[7] A further 13 were built to a similar design in 1950 as the 58 class.

Demise and Preservation

The first was withdrawn in October 1957, the last in September 1961. The last example in traffic was saved for preservation by the New South Wales Rail Transport Museum. In June 1975, 5711 was hauled from Enfield to Thirlmere by 3801.[8] In September 2008 it was relocated to the Valley Heights Locomotive Depot Heritage Museum where it is being statically restored.[9]

Preserved D57 Class Locomotives
No.DescriptionManufacturerYearCurrent OrganisationLocationStatusRef
57114-8-2 goodsClyde Engineering1929Transport Heritage NSW Valley Heightsstatic exhibit[9]

See also

References
  1. "King's of the Road" Roundhouse October 1979 page 23
  2. Oberg, Leon (1984). Locomotives of Australia 1850's - 1980's. Frenchs Forest: Reed Books. p. 157. ISBN 0 730100 05 7.
  3. Grunbach, Alex (1989). A Compendium of New South Wales Steam Locomotives. Sydney: Australian Railway Historical Society, NSW Division. pp. 201–209. ISBN 0 909650 27 6.
  4. http://www.australiansteam.com/5711.htm
  5. Oberg, Leon (February 1974). "The End of the 57-Class Locomotives". Australian Railway Historical Society Bulletin: 29–30.
  6. ±Locomotives, A Guide, written by Gifford Eardley
  7. Slee, David E (January 2000). "D57 and D58 Classes—Design Differences and Power Comparisons". Australian Railway Historical Society Bulletin: 3–19.
  8. "Museum on the Move" Roundhouse June 1976 page 16
  9. Locomotive, Steam 5711 Department of Environment & Heritage

Further reading
  • Belbin, Phil; Burke, David (1981), Full steam across the mountains, Sydney: Methuen Australia

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