To facilitate passenger working, their maximum allowable speed was raised from 50 mph (80 km/h) to 60 mph (96 km/h) on the key North Eastern, Ballarat, Bendigo and Geelong lines.
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.
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