WAGR Ms class
The Ms class were ordered new from Beyer, Peacock & Coy as a superheated version of the standard M class which they built previously in 1911. Superheating improved their steaming qualities making them more favourable with crews for their free-steaming abilities. In 1934 a single M class, No. 389 was converted to a Ms at Midland Railway Workshops. Withdrawals for the class began in 1947 and continued until 1955 when all had been scrapped.