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Victorian Railways Dd class : ウィキペディア英語版 | Victorian Railways Dd class
The Dd class (later reclassified into D1, D2 and D3 subclasses) was a passenger and mixed traffic steam locomotive that ran on Victorian Railways from 1902 to 1974. Originally introduced on mainline express passenger services, they were quickly superseded by the much larger A2 class and were relegated to secondary and branch line passenger and goods service, where they gave excellent service for the next fifty years. The Dd design was adapted into a 4-6-2T tank locomotive for suburban passenger use, the Dde (later D4) class. They were the most numerous locomotive class on the VR, with a total of 261 Dd and 58 Dde locomotives built. ==History==
By 1900, Victoria's express passenger locomotive fleet was almost exclusively made up of 4-4-0 designs of the Old A, New A, and the most recent AA class. These locomotives reflected contemporary British locomotive practice (as did the VR's fleet of 0-6-0 goods locomotives), in no small part due to the Victorian Government having appointed, in 1884, a Midland Railway manager, Richard Speight, as its first Chief Railways Commissioner. The Commissioners then asked British locomotive engineer Edward Jeffreys to design five standard types of locos, in partnership with the British locomotive manufacturer (Kitson & Co. of Leeds). At the turn of the century, in what marked a major shift in policy, the VR under recently appointed Commissioner Mr. J Mathieson set up a Locomotive Design Section for in-house development of future motive power. The Dd class locomotives were the first product of this exercise.〔(【引用サイトリンク】title=Victorian Railways, Museum Victoria, Australia: Setting New Standards )〕 A 4-6-0 design equipped with 5 ft 1 in driving wheels, saturated steam boiler and Belpaire firebox, the Dd reflected the considerable talent of VR's design team, which included ex-Beyer, Peacock and Company recruit Eugene Siepen, future VR Chief Mechanical Engineer Alfred Smith, and Rolling Stock Branch manager Thomas Woodroffe.
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