WAGR Dd Class

WAGR Dd class
Dd592 passes through Jandakot with an ARHS excursion train, 1986
Type and origin Power type Steam Builder Midland Railway Workshops Build date 1946 Total produced 10
Specifications Configuration: ​  • Whyte 4-6-4T Gauge 3 ft 6 in (1,067 mm) Driver dia. 4 ft 6 in (1,372 mm) Length 43 ft 3 in (13.18 m) Loco weight 72 long tons 0 cwt (161,300 lb or 73.2 t) Fuel type Coal Water cap 1,820 imp gal (8,300 l; 2,190 US gal) Firebox:  • Firegrate area 18.6 sq ft (1.73 m2) Boiler pressure 160 lbf/in2 (1.10 MPa) Cylinder size 18 in × 23 in (457 mm × 584 mm) Valve gear Walschaerts
Performance figures Tractive effort 18,768 lbf (83.48 kN) Factor of adh. 4.7
Career Operators Western Australian Government Railways Numbers Dd591-Dd600 Nicknames Donald Ducks Preserved Dd592, Dd596 Disposition 2 preserved, 8 scrapped

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.

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. 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. The first were withdrawn in 1969, with the remainder in 1970/71 following the entry into service of the ADK/ADB class diesel multiple units.

Two have been preserved:

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