WAGR F class
Superheating of the F class began in 1924 and continued up to 1948 - resulting in the Fs class, though when they were relegated to shunting duties in the 1950s they were rebuilt to normal saturated locomotives for economic reasons. Two of the F class are preserved, No. 398 (452) at Collie, and Fs class No. 460 (407) at Bassendean Railway Museum.