Multiple unit 70s became regular visitors on the Camden railway line prior to its closure, working coal trains from Narellan.

Possibly the most unusual duty allotted to the class was the working of the new Interstate Profile train during the latter part of 1963.

Tumut and Cooma were included in the schedule as large profile loads were common to these destinations during the construction of the Snowy Mountains Scheme.

They operated transfer workings within the Illawarra district and shunting duties at Port Kembla North.

In December 1963, instruction classes on the new locomotives commenced in two railway carriages at Port Kembla station.

On 1 January 1964, 7003 was the first locomotive to enter the new Port Kembla depot with all ten having arrived by the end of the month.

With the construction of the new Inner Harbour at Port Kembla and its associated branch from Coniston completed in October 1953, there was a transfer of coal loading operations to that facility.

Additional duties for the 70 class were found as shunters in Port Kembla North Yard, transfer workings to the Australian Iron & Steel Exchange sidings at Cringila and even shunting passenger carriages at Wollongong station.

All locomotives were issued to traffic in the standard colour scheme of Indian Red with chrome lining.