The WAGR P and Pr classes are two classes of 4-6-2 "Pacific" type steam locomotives designed for express passenger service on the Western Australian Government Railways 3 ft 6 in (1,067 mm) narrow gauge mainline network. The initial designs were prepared by E.S. Race and together the two classes had a total build number of thirty-five locomotives, the P and Pr classes entering service in 1924 and 1938 respectively.