New South Wales D57 class locomotive

New South Wales D57 class locomotive
New South Wales D57 class
5711 stands in Junee yard ready to head north on 23 September 1961
Power type Steam
Builder Clyde Engineering
Total produced 25
Configuration 4-8-2
UIC classification 2'D1'h
Gauge 4 ft 8 1⁄2 in (1,435 mm)
Driver diameter 5 ft 0 in (1.524 m)
Weight on drivers 212,000 lb (96 t)
Locomotive weight 311,000 lb (141 t)
Boiler pressure 200 psi (1.38 MPa)
Firegrate area 65 sq ft (6.0 m2)
Heating surface:
Total		 3,390 sq ft (315 m2)
Superheater area 775 sq ft (72.0 m2)
Cylinders Three
Cylinder size 23.25 × 28 in (591 × 711 mm)
Valve gear Gresley conjugated
Tractive effort 64,327 lbf (286.1 kN)
Factor of
adhesion		 3.82
Career New South Wales Government Railways
Class D57
Number 5701–5725
Nicknames Lazy Lizzies
Withdrawn 1960–1963
Disposition One preserved, remainder scrapped

The New South Wales D57 class locomotive was a class of 4-8-2 steam locomotive operated by the New South Wales Government Railways in Australia.

A total of 25 Mountain-type 3-cylinder steam locomotives were ordered by the N.S.W.G.R in 1929. They were built at the Clyde Engineering Works, Granville. They were among the heaviest of locomotives in Australia, at 250 tons, and this restricted them to only certain parts in New South Wales. They were also the most powerful engines used in Australia. They were very reliable and had the nickname "Lazy Lizzies" because they made heavy workings seem effortless. They were mostly held at Lithgow roundhouse and were used on heavy coal workings over the Blue Mountains, sometimes weighing 2000 tons. In 1960 the class began to be withdrawn and the last locomotive, 5711, was written off in 1963.[1]

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 D58 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.[2]

The only example left is 5711, which is currently being restored at Valley Heights.

Gallery

  • 5701 departing Clyde for a trial run to Penrith

  • 5712 at 'Soldiers Bank' near Mount Victoria

References

  1. ^ Oberg, L. (February 1974). "The End of the 57-Class Locomotives". Australian Railway Historical Society Bulletin: pp.29–30. 
  2. ^ Slee, David E. (January 2000). "D57 and D58 Classes—Design Differences and Power Comparisons". Australian Railway Historical Society Bulletin: pp.3–19. 

Further reading

v · d · eSydney and New South Wales Rail Rollingstock
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