There was a total of 33 members of this class of 2-6-4T mixed traffic side tank locomotives.

These locomotives were built by Beyer, Peacock & Company and delivered in 1891 for use on Newcastle coal traffic.

Their final services were on short light branch lines, such as Kurrajong, Carlingford, Camden, Rogans Hill and Morpeth.

As part of the 1924 reclassification scheme, these 21 locomotives were grouped with the twelve E(10) class to form the (Z)20-class.

It has been preserved by the NSW Rail Museum, Thirlmere and cosmetically restored.