The B class were a class of diesel locomotives built by Clyde Engineering for the Western Australian Government Railways between 1962 and 1965.
The first five B class units entered service in 1962. Three years later, a second batch of five was delivered.
The second batch differed from the first only in having sloping cab sides, to enable the second batch to pass underneath the limited clearance cranes on the Fremantle wharves.
All members of the class spent the whole of their working lives in the Perth metropolitan area, and were written off as a group in September 1984. Some of them have since been preserved.
- Gunzburg, Adrian (1968). WAGR Locomotives 1940–1968. Perth: Australian Railway Historical Society (Western Australian Division). pp. 38, 49. OCLC 219836193.