The WAGR Es class were a total of 19 steam locomotives operated by the Western Australian Government Railways (WAGR) from 1924 to 1958.

Es class No. 308 on display at Bassendean in 2010.

The Es class were the result of superheating the standard E class which was built for express services. The superheated boilers were built by Midland Railway Workshops who fitted them to the E class when they went in for repairs. In their superheated form, the engines consumed less coal and were more cost-efficient on heavier trains. Some were fitted with larger cylinders and classed Esl, those who retained original cylinders became Eso - however, these designations were later dropped, becoming simply the Es class. No. 308 has been preserved and is on display at Bassendean Railway Museum.