Modified Front End was an extremely cost effective improvement given that it allowed the VR to defer new locomotive construction through improvements to existing locomotives that at the time cost just £140 ($280) per locomotive.
A long overdue replacement for the 1907-era A2 class 4-6-0, their development and construction was repeatedly delayed due to financial constraints caused by the Great Depression and later the manpower and materials shortages of World War II and the immediate postwar period.
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Intended to eliminate the use of double heading A2 class locomotives on Overland services on the steeply graded Western line to Adelaide, wartime restrictions led to only one locomotive being built.