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Victorian Railways class DD
Australia | 1902 | 261 produced
D<sup>D</sup> No. 5902 on a factory photo
DD No. 5902 on a factory photo

The class DD express locomotive marked the change from the 4-4-0 to the 4-6-0 wheel arrangement for the Victorian Railways. It was the railway's first locomotive, which they developed themselves in 1902 and which was no longer based on British designs. As early as 1907 it was superseded by the more powerful class A2 and was no longer used in express service.

Thanks to its low axle load, it could now be used in mixed service on branch lines. As early as 1907, 58 were rebuilt into 4-6-2T tank locomotives for suburban service in Melbourne and designated class DDE. They were later given the designation D4, but were scrapped in 1924 and 1925 due to electrification.

Production of the normal tender variant ran until 1916, with individual production lots being put out to tender again and again. In order to test the production of their indigenous design abroad, 20 were built at Beyer, Peacock & Co. and at Baldwin. The last locomotives were already delivered with superheaters, and many existing ones were retrofitted. Just as the tank variant was soon called D4, the saturated locomotives were soon called D1 and the superheated ones D2.

D4 No. 279
D4 No. 279
Locomotive Magazine, September 1939

A total of 261 were built. Between 1929 and 1947, 93 locomotives were rebuilt with the more powerful and superheated class K boiler, which now became the D3. About half were scrapped by about 1950, and most of the rest by the 1960s. Only one, used as an inspection locomotive, remained in service until 1974. Today only the 639 is still operational and around 15 others are existing or preserved non-operational.

VariantDDrebuilt D2DDE
Built1902-1916from 1914from 1908
ManufacturerNewport, Ballarat North, Bendigo, Baldwin, Beyer, Peacock & Co., Walkers, Thompsons Ltd, Phoenix FoundryNewport
Axle config4-6-0 (Ten-wheeler) 4-6-2T (Pacific) 
Gauge5 ft 3 in (Irish broad gauge)
Dimensions and Weights
Length57 ft 4 9/16 in41 ft 10 3/8 in
Wheelbase24 ft 3 1/2 in31 ft 4 1/2 in
Fixed wheelbase13 ft12 ft 10 in
Total wheelbase48 ft 6 in48 ft
Service weight118,720 lbs122,976 lbs154,560 lbs
Adhesive weight86,912 lbs87,808 lbs96,992 lbs
Total weight212,352 lbs217,616 lbs
Axle load29,120 lbs29,344 lbs32,480 lbs
Water capacity5,068 us gal5,058 us gal
Fuel capacity11,200 lbs (coal)
Power sourcesteam
Estimated power700 hp (522 kW)800 hp (597 kW)750 hp (559 kW)
Optimal speed22 mph26 mph20 mph
Starting effort20,375 lbf19,368 lbf24,196 lbf
Power Plant
Driver diameter61.5 in61 in
Boiler pressure175 psi165 psi185 psi
Expansion typesimple
Cylinderstwo, 18 x 26 intwo, 19 x 26 in
Grate area21.2 sq ft22.5 sq ft
Firebox area107.5 sq ft120 sq ft
Tube heating area1,267.5 sq ft1,034 sq ft1,288 sq ft
Evaporative heating area1,375 sq ft1,154 sq ft1,408 sq ft
Superheater area334 sq ft
Total heating area1,375 sq ft1,488 sq ft1,408 sq ft
Calculated Values
steam locomotive
tank locomotive
last changed: 03/2024

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