ZIB 100 was an AEC Reliance 2MU3RAE which entered service in 1965.
Its body was built by Freighter Industries, Adelaide, as a coach which seated 45 passengers. It featured high-back seating and was used for charter services.
In late 1974, a second coach (Bus 251 – a Volvo B58) joined the fleet.
Bus 100 was withdrawn from service in June 1976.