The R Class are diesel locomotives built by English Electric, Rocklea for the Western Australian Government Railways in 1968.

The R class were a hood type general purpose diesel-electric locomotive.

The bogies are an English Electric design with low weight transfer characteristics.

They feature fully equalised primary spring gear, all traction motors in each bogie mounted with the nose-suspension facing inwards, traction thrust at near axle level and long pivot centres to reduce inter-bogie transfer.

[1] In 1968 the Western Australian Government Railways took delivery of five narrow gauge versions of the K class for use on bauxite traffic, the last three being fitted with 6 tonnes (5.9 long tons; 6.6 short tons) of ballast to improve their tractive effort.