at Hornsby were renumbered D4001–D4010 and the remainder began to have their control equipment removed and revert to ordinary trailers. To allow the Tangaras to be targeted as T sets, the remaining two-car sets became L sets in April 1988. When refurbished in the 1990s the crew compartments were removed. To operate services on the newly electrified Riverstone to Richmond line from August 1991, all 10 driving trailers and a number of Series 1 power cars were fitted with headlights. From October 1996, two-car L sets replaced U sets on suburban services between Thirroul, Port Kembla and Kiama. These were later extended to three cars before being replaced by Tangaras in October 2011. During the 1990s, all carriages were refurbished as part of the CityDecker program. This saw the interiors refurbished with white walls and ceilings, grey floors and blue seats. Power cars received a destination indicator and had yellow applied to the lower half of their fronts. Sliding Beclawat windows were replaced with hopper windows and doors painted yellow. Replacement After nearly 40 years of service, the Tulloch trailers were deemed life expired and the last withdrawn in March 2004. This resulted in a disproportionate number of power cars. To address the balance, 23 Comeng power cars were converted into trailers. Most of the conversions were Series 1 cars, however a few conversions involved Series 2 cars. This involved the removal of the yellow painted front (on some cars), pantograph and opening up of the driving compartment for passengers. Some cars had their external lights removed and plated over, and their cabs removed, other retained these fittings. All retained their motors and compressors for ballast purposes. The destination indicators were also retained as it would have cost too much to have them removed; they were painted over instead. These cars are easy to recognise as they have an open space where the pantograph once was. During their history, S sets operated on all Sydney lines. The last six car R sets were deemed life expired in August 2012, with all carriages formed into four car S sets (which were typically operated in pairs). The last sets were transferred from Mortdale to Flemington in March 2013 bringing an end to their operation on Eastern Suburbs & Illawarra services. However, one set remained operational through parts of March and April on the line. In May 2014, all Hornsby sets were transferred