The WAGR P and Pr classes were two classes of 4-6-2 steam locomotives designed for express passenger service on the Western Australian Government Railways 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. Both classes were used on express passenger services, greatly improving the economy and speed of long-distance passenger travel in Western Australia, the results of which were most visible on the Western Australian stage of the Trans-Australian Railway and Westland Express.

The Westland was the name given in 1938 to the overnight train operated by the Western Australian Government Railways (WAGR) with sitting and sleeping cars between Perth and Kalgoorlie, where it connected with the Trans-Australian service to Adelaide.