WAGR Dd class

The WAGR Dd class was a class of 4-6-4T tank locomotive operated by the Western Australian Government Railways (WAGR) between 1946 and 1972.

WAGR Dd class
Dd592 passes through Jandakot with an ARHS excursion train, 1986
Type and origin
Power typeSteam
BuilderMidland Railway Workshops
Build date1946
Total produced10
Specifications
Configuration:
​
 • Whyte4-6-4T
Gauge3 ft 6 in (1,067 mm)
Driver dia.4 ft 6 in (1,372 mm)
Length43 ft 3 in (13.18 m)
Loco weight72 long tons 0 cwt (161,300 lb or 73.2 t)
Fuel typeCoal
Water cap1,820 imp gal (8,300 l; 2,190 US gal)
Firebox:
 • Firegrate area		18.6 sq ft (1.73 m2)
Boiler pressure160 lbf/in2 (1.10 MPa)
Cylinder size18 in × 23 in (457 mm × 584 mm)
Valve gearWalschaerts
Performance figures
Tractive effort18,768 lbf (83.48 kN)
Factor of adh.4.7
Career
OperatorsWestern Australian Government Railways
NumbersDd591-Dd600
NicknamesDonald Ducks
PreservedDd592, Dd596
Disposition2 preserved, 8 scrapped

History

The Dd type was an evolution of the Dm class. However unlike the Dm class which used components of the old E Class tender engines, the Dd class components were all new.[1] All were built at the Midland Railway Workshops entering service between April and November 1946. They were built to haul suburban passenger services in Perth, although they did on occasions work to Bunbury on the South Western and Merredin on the Eastern lines.[2][3][4] The first were withdrawn in 1969, with the remainder in 1970/71 following the entry into service of the ADK/ADB class diesel multiple units.[2][3]

Preservation

Two have been preserved:

  • Dd592 was preserved by the Australian Railway Historical Society in July 1972. In May 1984, Westrail commenced work at Midland Railway Workshops to restore it to operational condition as a Bicentennial project. It returned to service on 20 July 1985 and remained in service until August 1995. It became a static exhibit at the Western Australian Rail Transport Museum in May 1999.[5][6][7]
  • Dd596 was also purchased by the Australian Railway Historical Society in April 1974 and was placed on display at the Western Australian Rail Transport Museum. In July 1990 it was placed on display at the Gosnells Railway Market.[5][6][8]

Class list

The numbers and periods in service of each member of the Dd class were as follows:[9]

Road
number		 In service Withdrawn Notes
591 12 April 1946 10 February 1969
592 17 May 1946 14 August 1972 Preserved at Western Australian Rail Transport Museum
593 14 June 1946 10 September 1970
594 28 June 1946 10 February 1969
595 19 July 1946 17 June 1971
596 9 August 1946 17 June 1971 Preserved at Gosnells Railway Market
597 31 August 1946 17 June 1971
598 20 September 1946 10 February 1969
599 11 October 1946 10 February 1969
600 1 November 1946 10 September 1970

See also

References

Notes
  1. Gunzburg 1984, p. 125.
  2. Turner, Jim (1997). Australian Steam Locomotives 1896-1958. Kenthurst: Kangaroo Press. p. 141. ISBN 086417778X.
  3. Oberg, Leon (2010). Locomotives of Australia 1850s-2010. Dural: Rosenberg Publishing. pp. 230–231. ISBN 9781921719011.
  4. Clark, Peter (2012). The Australian Locomotive Guide. Dural: Rosenberg Publishing. p. 46. ISBN 9781922013682.
  5. Whiteford, David; De Bruin, Charles; Watson, Lindsay; Watson, Neville (1983). Western Australian Preserved Locomotives. Elizabeth: Railmac Publications. p. 7. ISBN 0 949817 19 8.
  6. D and Dm Class Tank Locomotive Rail Heritage WA
  7. Dd592 Australian Steam
  8. Dd596 Australian Steam
  9. Gunzburg 1984, p. 126.

Bibliography
  • Gunzburg, Adrian (1968). WAGR Locomotives 1940–1968. Perth: Australian Railway Historical Society (Western Australian Division). pp. 13–15, 47. OCLC 219836193.
  • Gunzburg, Adrian (1984). A History of WAGR Steam Locomotives. Perth: Australian Railway Historical Society (Western Australian Division). ISBN 0959969039.

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