They were primarily intended for use on the steeply-graded Main Northern line from Strathfield to Hornsby and North Shore line from Milsons Point to Hornsby, hence their hefty weight.

They were superseded by the Class 30 and transferred for use on Newcastle suburban services.

As part of the 1924 reclassification scheme, the remaining 13 members of the class were reclassified as the Z11 class, numbered 1101 to 1113, 50 having been sold to Australian Iron & Steel and 51 to the South Maitland Railway.

[2] Post renumbering, 1104 was to the Nepean Sand & Gravel Company, Richmond and 1111 to Southern Portland Cement, Berrima.

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