by Tulloch in 1968, 53 Series 1 power cars were ordered from Comeng and delivered in 1972–73. They were paired with 1965–67 Tulloch-built trailer carriages that had previously operated in company with single deck power cars. The first 39 were painted tuscan to match the trailer cars while the last 14 were painted in the newly introduced Public Transport Commission blue and white livery.From 1976, the blue and white livery was replaced by an Indian red livery. In 1979, painted Series 1 cars began to have their paint removed to match the Series 2 cars. Only seven were completed, and it wasn't until August 1988 that the program recommenced with the last carriage treated in 1990. Subsequent orders saw another 154 power cars, 67 trailer cars and 85 driving trailer cars built by Comeng. These were all built to the Series 2 design with Budd type polished inserts on the carriage sides, flat rather than tapered number 2 ends, throw-over rather than sliding reversible seats, upgraded interior lights and a natural stainless steel finish. A further order saw 80 power cars and 70 trailer cars constructed by A Goninan & Co in 1978–80. These cars differed in having a squarer type of fluting and flat fronts on the power cars. All were formed into either four-car S sets or two-car T sets. In practice, there were only a few diagrams requiring two carriage sets resulting in most T sets being used to form six and eight-car sets. By the early 1980s, some permanent six-car sets had been formed and targeted as R sets. In December 1983 there were 60 T sets, 12 months later this was down to 19. In April 1982, ten driving trailers were introduced on local services between Scarborough and Port Kembla. These two car PK sets ran until the line was electrified in December 1985. They were hauled by 48 class diesels but because of incompatibility between the electrical systems, the guard operated doors were disconnected. From June 1984, four three-car sets of Goninan stock operated suburban services from Newcastle to Fassifern and Morisset as NC sets. This stock was allocated to Mortdale and periodically rotated. In August 1989, this was reduced to two sets. In September 1989, the remaining NC sets were replaced by two carriage L sets from Hornsby. These were replaced in January 1992. In May 1987, the ten newest driving trailers based