By April 1978 the Australian Federated Union of Enginemen placed a ban on the 42 class operating as lead engines due to cab conditions.
From June 1984 the Australian Federated Union of Locomotive Enginemen placed a ban on the class as leading locomotives, meaning they could only be used as second locomotives, although they were able to be used on Sydney metropolitan trip and Liverpool Range banking duties.
As a result Metro took the Rail, Tram and Bus Union to the federal industrial tribunal.
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