The Comeng 1800 class was introduced into service in the late 50s to service suburban areas which did not justify a steam hauled service. These railmotors could be found throughout the Brisbane suburban network, and were used to run some South Brisbane-Southport services.

These railmotors were displaced gradually with the newer 2000 class due to their slow acceleration.

Unfortunately very few of these railmotors were preserved, with the only one in original condition being 1815 at the Rosewood Railway Museum. Two 1800 class trailers have found there way on to the Gulflander service and are hauled by RM93. Another one has surfaced in a paddock in the Mary Valley region, at Greenbank on Private Property and another in Jandowae.