Diesel locomotive
After being fitted with these tenders, seven of the class was attached to Alpha where they had a brief period of glory in the early 1960s when they replaced the C17 Class hauling the air-conditioned "Midlander" between Alpha and Longreach. The American engines with a larger boiler capacity were able to reduce running times in the sections that contained many long banks. Diesel locomotive took over the working in 1963.