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The WAGR Ms class were a total of 8 successful Garratt steam locomotives operated by the Western Australian Government Railways (WAGR) from 1913 to 1955.

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.

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  No. 429 at Jarrahdale.
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  No. 425 at Midland Junction on the 1920s.
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  No. 428 at Mundaring Weir in the 1930s.

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