WAGR Eso class
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The WAGR Eso class were express steam locomotives operated by the Western Australian Government Railways (WAGR).
The Eso was a designation reserved for Es class (superheated E class) locomotives that retained their original 17-inch cylinders in contrast to those that were rebuilt with 19-inch cylinders and classed Esl. By the early 1940s, the Eso classification was abandoned being replaced by the regular Es designation which all under the former classification carried until their withdrawals.
