WAGR M class (1911)
The M class were powerful locos designed to be able to run on lighter-laid lines and around sharp 5-chain radius curves, which they did to great effect, being more powerful than the F class while also having far greater route availability. The second batch was ordered as superheated and became the Ms class, though a standard M class was converted in 1934. Withdrawals began in 1947, with the last withdrawn and scrapped in 1955, none were preserved. They were succeeded by the Msa class Garratts.