The WAGR Cs class were a total of 16 steam locomotives operated by the Western Australian Government Railways (WAGR) from 1929 to 1961.

Cs class No. 270 Black Butt near Banksiadale around 1960.

The Cs class were the result of superheating standard C class locomotives from 1929 to 1949. The Cs class turned out to be a success hence why conversions continued until the late 1940s. Withdrawals started in the 1950s with the arrival of the W class, by 1961 all had been withdrawn, with the last scrapped in 1964 at Subiaco.

No. 270 Black Butte (as renamed) pulling an ARHS tour train, around 1960.