History
During the early 1950s, Victorian Railways embarked on a massive upgrading of its ageing locomotive fleet as part of 'Operation Phoenix', an £80 million program to rebuild a network badly run down by years of Depression-era underinvestment and wartime overutilisation.
Victoria's branch line railway network, laid with 60 lb/yd rail and featuring gradients of up to 1 in 30, was still largely served by the D1, D2 and D3 variants of the once 261-strong 1902-era Dd class 4-6-0, which by the early 1950s was at the end of its life. These were supplemented by 53 K class 2-8-0 locomotives, some of which had been built as recently as 1946. Although highly successful, the K was unsuitable for potential conversion from 5 ft 3 in (1,600 mm) broad gauge to 4 ft 8 1⁄2 in (1,435 mm) standard gauge in the event of the Victorian network being standardised, and VR policy was for all new locomotives to be engineered for easy conversion. As such, the building of further K class was not a desirable option.
With mainline electric and diesel-electric locomotives already on order, Victorian Railways' design team opted for an updated, gauge-convertible K class as what would turn out to be their final steam locomotive design.
Read more about this topic: Victorian Railways J Class
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