to either the No.1 or No.2 End. Engines As built, they were fitted with petrol engines, the first four (CPH 3-6) receiving a 6-cylinder 75 hp Thornycroft Z6 and the others a 6-cylinder 95 hp Leyland type with a four-speed mechanical transmission controlled by a gear lever in the cab. Some units were later fitted with a 6-cylinder 150 hp Leyland petrol engine with a Lysholm-Smith hydraulic transmission. Experiments were also made with AEC and Winton engines in some vehicles. A 6-cylinder 120 hp Leyland diesel engine was also trialled in one unit. During World War 2, to conserve fuel, gas producer units were fitted to six vehicles. Five of these six vehicles were destroyed when fire spread to the vehicle. Beginning in 1945, a programme began to replace the petrol engines with 6-cylinder GM Detroit Diesel 71 Series engines and Twin Disc 3-position hydraulic transmissions. It was also at this time that multiple unit controls were fitted. A single driver's cab and multiple unit controls were fitted to the No.2 End of the five trailer cars at this time. Operations A total of 37 vehicles were built and they operated many branch line services throughout the state, from Kyogle in the north to the Riverina in the south, as well as extensively through the Central West regions, until their widespread withdrawal in November 1983 and replacement by road coaches. A fleet of 12 CPHs continued to be used extensively in the Wollongong area, working north to Waterfall, west to Moss Vale and south to Port Kembla and Kiama. In Newcastle a CPH provided passenger services on the Belmont line until these ceased in April 1971. They also operated pre-electrification service on many Sydney suburban services. These include Bankstown to Lidcombe, Clyde to Carlingford, Liverpool to Campbelltown, Westmead to Rogans Hill, Kingsgrove to East Hills, Hornsby to Cowan, Blacktown to Richmond and Sutherland to Waterfall. In November 1984 the last Sydney area motors were withdrawn from Richmond services along with most of those in Wollongong. The final two CPHs, 36 and 37, were withdrawn after the Moss Vale to Wollongong service ceased in September 1985. Preservation Following list of preserved Rail Motors: Gallery References External links Railcars of New South Wales Train-related introductions in 1923 1923 in rail transport