the two locomotives in the class, ca78 and ca79, had been built in 1907 and 1905, respectively, by baldwin locomotive works, philadelphia, usa, and had been part of nh's g-4a class. they arrived in australia in august 1943 and were used on the trans-australian railway. ca78 was withdrawn in 1945 and ca79 in 1950. both were scrapped in 1956.