An order for 20 locomotives was placed with the VR's Newport Workshops in 1946, but remained unfulfilled for years as shortages of steel and manpower saw other projects (such as the overhaul of badly run-down infrastructure and the building of extra X class goods locomotives) given precedence.
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R 707, which due to various defects had still not been put into service by 1954, was selected for modification for pulverised brown coal (PBC) operation, in conjunction with trials of this fuel being undertaken with X class 'Mikado' X 32.
They were the most powerful goods locomotive on the VR until the advent of diesel-electric traction, and operated over the key Bendigo, Wodonga, and Gippsland mainlines.
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